Subsonic Filters, protect your subwoofer from low bass using a multi-meter.

In this video I show you everything you need to know about subsonic (a.k.a. infrasonic) filters. The subsonic filter is used to protect your subwoofer from damage due to playing low and loud. It is easy to set all you need are test tones and a multi-meter.
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A special thanks to HIFI Vega and 123Toid for their help with this video. Check out their channels:
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Affiliate* links to items used in this video:
Parts Express:
Ultimax Subwoofer:
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Digital Multimeter: amzn.to/3cTsYLv
*As an affiliate/associate marketer I may earn a small commission from qualified sales.

[@NinoValleyTv]

I was just watching the office before watching this video 🤯

[@DIYAudioGuy]

That's what she said!

[@MikeRoe24]

Good helpful video. You do a really good job at explaining stuff thats important in car audio that a lot of people don’t realize. Thank you for doing what you do for all of us

[@jaybee8210]

These videos are EXTREMELY helpful, thank you for making them.

[@DIYAudioGuy]

That is the goal.

[@elfuego4341]

Another top quality video with some very useful information - Thanks!

[@DIYAudioGuy]

Glad you enjoyed it!

[@kimwalls9906]

love the info and clear delivery. Thanks!

[@DIYAudioGuy]

Thanks for watching.

[@sammypotpie]

Very good information. A mind of audiophilicity. Bless and thank you.

[@DIYAudioGuy]

Glad you liked it.

[@Toid]

Killing it! Great explanation! I must say, I love those Uglies ;)

[@DIYAudioGuy]

Everybody loves bumping uglies.

[@briank.2650]

I'm a math freak & one of my favorite parts of being an audiophile other than the beauty of sound is the math. If you're not sure about something, just check the math. Awesome video. Thank you

[@DIYAudioGuy]

It's a valuable tool.

[@melvinrubio2278]

Shirt is the winner on this video!!!!

[@DIYAudioGuy]

That's what she said.

[@edud8452]

DIY Audio Guy you are the bass Professor. 👍

[@DIYAudioGuy]

🤣🤣🤣🤣

[@GaussGodden]

This video cracks me up.. great video , informative, in addition even the way you put in the ad is funny..

[@DIYAudioGuy]

Thanks!

[@GaussGodden]

@@DIYAudioGuy any good hifi grade subsonic filters you recommend?

[@DIYAudioGuy]

@@GaussGodden not particularly. They're all just crossovers after all.

[@GaussGodden]

@@DIYAudioGuy I want one that has minimum degrade in sound quality. I use dj effects.. some effects sends high amount subsonic bass that can damage speakers ..

[@rafagomezz7750]

exelente explicación, felicitaciones por su video realmente muy importante, siga adelante con su canal y con el mundo del car audio

[@evilinside5984]

Since i have access to a SPL meter, I use that, along with test tones, and set on repeat, to set my subsonic filter. I recommend using a test tone 5Hz to 10Hz below port tuning, and reducing SPL output @ that freq., by 1 to 3Db depending on how much power you have, and how conservative you want to be. Example: If you have (2) -1,000 watt r.m.s. Subwoofers, and power them with recommended power, which is usually around 75% of r.m.s. power handling, so around 1,500 r.m.s for the pair, i would use a test tone 7Hz below port tune, and reduce output by 2Db. Make sure the subsonic is turned all the way down, before starting the test. Start selected test tone on repeat @ a conservative volume, example: If a system is capable of 140Db @ max, @ 45Hz, and the ported enclosure was tuned @ 37Hz, i would use a 30Hz test tone, and turn up the volume slowly to around 120Db (have SPL meter set to real time=Not peak hold), @30Hz, so its loud enough, but very sustainable, and wont heat up coils quickly, or drop voltage. Also listen to the speaker, if it makes bad noises, turn it down, or off. Then slowly adjust the subsonic filter, until it reduces the Db by 2, @ 30Hz, so 118Db. If you want to be more conservative/safe, set subsonic -3Db, @ 5Hz below port tuning, and if you want to be less conservative, set subsonic -1Db, @ 10Hz below port tuning. Hope this helps, have a great day, Audio fans.

[@flaman78]

Dope shirt. Great info.

[@DIYAudioGuy]

Thanks!

[@3RDERA]

Nailed it man! Keep up the great work!!! P.S. so...18 hz out of a 5.25 speaker at full tilt...the cone would have to move too much🤔.... 🧠2 cubic ft enclosure tuned to 18 hz🤓 too bad it would be a one note wonder box. 🔊🔊✌🏽

[@DIYAudioGuy]

Hummmm, sounds interesting.

[@2002ZRX1200R]

Box volume and tuning doesn't determine bandwidth, the parameters do. Plenty of drivers have the ability to play low and flat.

[@3RDERA]

@@2002ZRX1200R you are correct, Drivers nowadays can play that low and flat, but realistically a 5.25 inch driver playing that low and flat in its upward bandwidth is going to have very little output in that sub 40hz range. I was Using the example of trying to get loud in the sub 40 hz frequencies with that 5.25” driver , which in that case, the enclosure Would definitely Have to be optimized to Keep the driver from Tearing it self Apart

[@antonmaclean8418]

Ok,I'm hooking up my son's sub amp, I'm just going to put all settings at 1/2 way and hope for the best , hopefully that will be ok

[@JoshM7]

Be mindful guys the -3dB at the Crossover Point only applies to Butterworth. (And 1st order Bessel) My Hifonics ZEUS ZRX1216.1D for example will not follow the .708 like this video. I found it to follow .58 which is exactly like a 2nd order Bessel filter. I found out my crossover type by leaving the infrasonic filter at the lowest it would go (10Hz in my case) and playing a sine wave at the highest mine would go (40Hz) and taking note of the voltage difference to figure out the filter type. In my case my sub almost doesn't need a infrasonic filter (Mines set to 13Hz now or something crazy) with how low I'm tuned, but these videos still helped me push to figure out some cool new things. Happy New Year everyone!

[@DIYAudioGuy]

That's good! Nothing wrong with experimenting to see how something works.

[@kewlbug]

Would Like to see in in depth review of the Audiocontrol Epicenter. It's been around forever, but I just discovered it. Apparently its just like a guitar octave pedal. A game changer for bass heads. Especially if you like older classic rock and maybe even old hip hop.

[@DIYAudioGuy]

I've never had a need for one.

[@kewlbug]

@@DIYAudioGuy Most people don't "need" one. Some people do. A lot of modern cars cut your bass. And older music barely has any bass. Or some people just want crazy bass. Just giving you content ideas. Or did you stop making videos?

[@ulisesmunguia9763]

@@kewlbug no one has videos on that thing it pisses me off

[@briank.2650]

OMG YES 😲😃! I've been kicking around the idea of buying the Epicenter but keep thinking it may not be what I'm expecting & therefore wanting. I'd love an indepth look & this device.

[@kewlbug]

@@briank.2650 They are great, I'd like to get another one, maybe the micro. I didn't have room in my car

[@ItzRazed]

Hey man. How do I know what kind of filter my amp runs like butterworth, the Riley one? I’m not sure which one mine has. It’s a Skar 1500.1D

[@B15SDMDESIGNS]

Im using a JL audio HD 1200/1 to run a 13W7 in a ported enclosure. The HD1200/1 has a infrasonic filter which is factory set at 30hz and can only be set to on or off. My ported enclosure is built to JL audio specifications and tuned to 34.6hz. I feel the 30hz infrasonic filter is a little too close to the box tuned frequency of 34 and may be losing/missing alot of bass. I've turned the infrasonic filter off and the sub plays alot better and sounds much smoother aswell. I can't help but be a little worried about damaging the sub.

[@DIYAudioGuy]

Yeah, you don't want to damage that awesome subwoofer. I think your answer will depend on the type of music you play. If you are into re-bassed music, trap and bass-heavy stuff (techmaster peb etc etc) you will want the filter. For normal music just go easy on the volume knob and turn it down if you hear distortion. It will distort before it bottoms out.

[@davidngoma6701]

Thanks very mucho...helpful

[@DIYAudioGuy]

Glad it helped

[@davidlunsford6155]

I have a 2015 VW beetle hatchback with an sa classic sundown and the 1500 mono amp @1ohm. Nothing is stock. I also have a 4ch@80. I'm trying to go more for SQ than SPL. What would be better for the hatchback area. Currently it's in a prefab 40-41hzs tune with 1.68 cub after everything is subtracted. I also have an extra battery in the back.

[@DIYAudioGuy]

A custom box is always best, but there is nothing wrong with a pre-fab. I have never used that sub so I cannot say for sure what the best box for it would be.

[@keenanlee3868]

Need help so my watts power sub is 4 595.5rms x by 2ohms =95.86 gain so my subsonic will be the same right ? My amp is 98.05

[@pipelinecowboy]

I've learned more in this video than I've heard and known in 20 years or I mean 28 years . Damn I'm old 😕 lol

[@DIYAudioGuy]

🤣

[@Vic_714]

You never stop learning! lol The more you know the less you know!

[@RandomThings-k2p]

Could you please do a detailed explanation on the different filters of winisd. I have been trying to get info to understand the terminologyi.e why Butterworth, likwiz, n4 etc etc

[@DIYAudioGuy]

We will try to answer on the live show today. kzbin.infoPhyeZpUSQyw?si=KgM_9A3W1Vvfe40l

[@jasonshahid2929]

I set my gain already and also my crossover to 80 hertz from your last 2 videos I’ve seen.. so I would do this after I set those two mentioned above and I should be good?

[@DIYAudioGuy]

That should work! I keep my infrasonic filter at 20 hertz. It's the lowest setting that my amplifier has and it's worked pretty well for me so far.

[@jamesgrice1412]

So I have 4 12” p2d2 fogates. I have 2 500 watt fosgate amps. What would be best set up for maximum low bass?

[@DIYAudioGuy]

That's kind of a big question. Are you looking for how to wire them, are you looking for how to tune the enclosure, are you looking for how to set up the crossovers and the subsonic filter?

[@VeritasEtAequitas]

I need an ISF for my infrawoofers. I dig the shirt.

[@DIYAudioGuy]

I have wasted a lot of time watching The Office.

[@billyjeepus824]

@@DIYAudioGuy how long ago did you get that shirt?

[@DIYAudioGuy]

@@billyjeepus824 I have no idea.

[@billyjeepus824]

@@DIYAudioGuy that shirt definitely looks like one I printed! Thats awesome

[@DIYAudioGuy]

@@billyjeepus824 My wife ordered it off of Amazon. Probably last Christmas. I think she bought them for the whole family.

[@brianbozarth3369]

Thanks!

[@DIYAudioGuy]

You bet!

[@Hammerback972]

0:20 DIY audio guy, did you warp space time? From one frame to the next your t-shirt flipped around😂😂. Ok. Back to listening and learning, just noticed you went from "Dunder Mifflin'" to "rednuD nilffiM"😂😂

[@funnytoe]

Are you going to put up a demo video of your trucks system?

[@DIYAudioGuy]

At this point probably not. I need some better test equipment for tuning the truck, and I'm already in the planning stages for the next build. I'd like to build a custom center console to hold all the amplifiers and then build a massive fiberglass box under the rear seat. something that can make use of every last inch of available space.

[@user-TurboD12]

Are all ISF's with the reading of 20-50 the same across different amplifiers, meaning, I been trying to figure out where is the 25hz position is on my Skar RP15001.d. Looking at this amp as an example because it shows the numbers and the Skar and this amp has the same range. Could I use this as a reference to help dial in my target frequency? Thank you

[@DIYAudioGuy]

You can't tell by looking at the dial. You got to grab a multimeter and measure it.

[@Bassotronics]

Being that my subwoofer system is tuned to around 15Hz, I always keep my infrasonic / subsonic filter off. And why so low you ask? Because Bass music fun! Sometimes it’s not just about listening to the music per se but having fun with what infrasonics can do.

[@DIYAudioGuy]

Hell yeah!

[@Bassotronics]

@ “DIY Audio Guy” I love your videos and I totally understand why we need an infrasonic filter. In fact, sometimes I don’t even turn on my subs and some music is beautiful as is. And other times I want to be a lil experimental and go crazy with the very lows. 😀

[@DIYAudioGuy]

@@Bassotronics The infrasonic stuff is loads of fun, it's awesome that you've got a system that you can enjoy like that

[@thekidbart4528]

Would you be able to test the Skar Audio SPL 12inch subwoofer box?

[@DIYAudioGuy]

Yes, but I would need some help buying the enclosure. www.patreon.com/DIYAudioGuy

[@NotJacobCollier]

Just to be sure. I have a CXA1200.1 from KICKER and while it does not have a subsonic filter knob you can adjust, on the KICKER website it says it has a “24db subsonic filter to prevent damaging frequencies”. Does this mean that it has some sort of automatic subsonic or am I SOL.

[@DIYAudioGuy]

That sounds like a subsonic filter at a fixed frequency. Does the website say what frequency they use?

[@paulio3]

​​​​25hz,24db fixed I'm using a DSP with Kicker sub amp were would I set my dsp using this amp being fixed ? ​@@DIYAudioGuy

[@bryanleiporsado6845]

English is not my first language, I can quite get the whole point but I'm missing out on some information, when you said about the cubic ft of the box the below octave thing, so if I have a 30hz tuned box and didn't used the software that you've said and unsure about anything I can just put it in 1/2 octave which is about 20hz right? (Cause yours are 40 to 30 if it's 1/2 octave) and about the -3 db thing, should I do that? Or I'm good with the tune of the box times .75? And is the 10v to 7.04v in general? (Depending on the outcome of the tune x .75 of course) So I have 30hz tuned box. 30 x .75 = 22.5 So maybe 23hz test tone right? Note: I've set the gain first of all. Then lower or increase the volume until you get 10v from the terminals? Then put it in 7.04v? Then that's it? Please help, I can't quite understand. Thank you.

[@DIYAudioGuy]

Yes, you have it figured out. You wan to set infrasonic filter at (tuning frequency) *.75. So play the appropriate test tone (with the filter off or set to the lowest possible setting) and adjust the volume knob until you get 10 volts (the 10 volts is just to make the math easy). Then turn on the filter and adjust the frequency until you get 7.04v on the DMM.

[@bryanleiporsado6845]

@@DIYAudioGuy Thank you so much!

[@coolazznicca]

I have a taramp HD3000 pushing two skar evl 12's I'm clipping on volume 10. Will that be electrical issues?

[@DIYAudioGuy]

It could be anything on the signal chain. It's hard to diagnose problems in the comments sections on KZbin videos.

[@SelfPreservation7]

Set the head unit first

[@jeezy5270]

So DIY I have 2 PPI pro mos np infrasonic filter on these amps , I listen to some rock mostly rap, r&b ( no magic Mike type play list ) are my selected listening choices 33hz or lower and do I have to rule out ported enclosure?

[@DIYAudioGuy]

Not sure what you mean by rule out a ported enclosure. You saying you should not use one?

[@jeezy5270]

That’s the question I was asking, I’ve had my equipment on the shelf for a while, when I had ported boxes years ago we never heard of infrasonic filter now I hear don’t run ported without it , just wanted your opinion if it’s ABSOLUTELY necessary to have it based on what I listen to for daily driver,

[@monstah408]

Just installed two ct sounds tropo 8” in a 2.000 sqft3 box with a 39hz frequency, just installed winisd type in all specs and around 50hz I’m over come excursion , so I set high pass filter at 50hz to be under the 9mm redline , it puts me right below the redline however I am max on my high pass filter is that correct ?

[@DIYAudioGuy]

That sounds odd -- not sure why you are exceeding x-max at 50 hz.

[@monstah408]

@@DIYAudioGuy yeah I enter all ct sounds Tropo specs , box specs and the wattage . To keep it under red line high pass filter has to be 48hz, I mean it sounds good but I feel just can’t hit them low hz ,

[@anthonybrown6143]

I would like to get your input about the Dayton Audio 18" subwoofer that Amazon is selling as a car subwoofer, and I would like to know is it worth buying?

[@DIYAudioGuy]

Yes! I am a big fan of the Ultimax. It is one of the house brands over at Parts Express. You can 5% off (parts-express.sjv.io/3PGnNr) with the Code DIY5

[@christopherconkright1317]

I bought a prebuilt box with two compr how do I find the port tuning frequency?

[@jeremey2072]

I bought a car with a 10" sub in a ported box and I would like to know how to figure out the tuning frequency as well. I'm scouring the comments but yours is the first one mentioning tuning frequency.

[@thekidbart4528]

Hello again I’m baaack 🤭…..okay so new skar box from their SPL line….if the 12inch Ported Box it Tuning Frequency is 41hz around where would I set the SubSonic Filter? Help? Please

[@joefrazier3086]

From what I understand, you should be around 30. But I'm still a little lost myself. Was a lot of information..

[@bugsysiegals]

I don't think you were exactly clear about this but do you play the same Hz tone as the desired infrasonic filter? In your example, you play 30Hz, adjust unfiltered volume until you read 10V at the speaker terminals, and then adjust infrasonic filter to reduce the voltage to 7.08V and the only thing which would change is the frequency of the tone you play? Should the tone be -3dB or 0dB?

[@DIYAudioGuy]

That is correct, if you want to set the filter at 30 hertz you play a 30 hertz tone.

[@JasonWW2000]

@@DIYAudioGuy Wouldn't it be more accurate to play a 20Hz tone and adjust the infrasonic freq until you see the voltage drop 12dB (10v to 2.5v)? If your looking at a 3dB drop at 30Hz then you having to be setting the frequency a little higher than 30Hz, maybe like 33Hz. I don't know, its a bit confusing.

[@triniboy802696]

Love the shirt

[@DIYAudioGuy]

A lot of people do!

[@brick2077]

So you're saying set the gain first then play the frequency that you are setting the subsonic or lowpass to. What ever number I get from that frequency I multiple it by .708 then dial in to the given number.

[@DIYAudioGuy]

Exactly.

[@john200871]

I've read elsewhere that in winisd you need to double the listed xmax of your sub when entering the data since in winisd it's looking for peak-peak. Is this the case?

[@DIYAudioGuy]

I have never heard that.

[@john200871]

@@DIYAudioGuy after more research that was only for pre a7 winisd

[@jeremymanick5684]

Hellos, question. Most amps comes with a 12db slope roll off for the crossovers. do we will have to apply the .708 of the ac voltage output if its already sloped or does that not apply to subsonic filter?

[@DIYAudioGuy]

Not sure what you mean. Typically when I set the subsonic I turn off all other crossovers so I don't muddy up the signal.

[@jeremymanick5684]

@@DIYAudioGuy i saw a couple amps that comes with a built in 12db slope for the crossovers when setting it on the amp, if its already 12bd down, and we apply the .707, wouldn't that make it 15dn down?

[@DIYAudioGuy]

@@jeremymanick5684 Most crossovers like this will have a dial that lets you set the frequency. You use the .707 to find the frequency you are shooting for.

[@Chris-B-Bassin]

Can I play a test tone that is -3db 29hz and it work like doing the math for .707?

[@cobybillhime9891]

I have a real question I'm setting up a build with a 15" sub and I'm building a box for it and I'm not 100% sure if I wanna go port or no port on the box

[@DIYAudioGuy]

I tend to go with ported.

[@ralphgarcia6605]

Do i need a subsonic filter if I'm running two 8 in bazooka tubes 200 watts and if I do what should I set it at ?

[@DIYAudioGuy]

Back in the day bazooka used to brag about being tuned to 39 Hz. Assuming nothing has changed then I think you probably need an infrasonic filter on them.

[@ralphgarcia6605]

@@DIYAudioGuy thanks for the reply 👍 I really like your videos

[@charlesuh60m]

I just ordered an American bass xr 10d4 and a rockville db15 amp. The sub is rated for 1,000 watts rms and the amp is rated for 1,500 watts cea rms. I was told it was better to have an amp that had more power than needed to avoid clipping. Is this true or did I make a bad decision?

[@DIYAudioGuy]

No, you did not make a mistake. At the very least if you decide you want a slightly bigger sub you don't have to replace the amp. But, you need to understand the logic behind that advice. It's not unusual for someone to buy subwoofer and an amp, set everything up and then discover that it's not loud enough for their taste. So what do they do? They turn the gain up and the subwoofer fails. So this rule of thumb was developed to prevent that from happening. It is a psychological trick used to keep us from clipping. If you buy a 800 watt amp to go with your 1,000 watt subwoofer then you think that you can crank the gain up a bit because the sub should be able to handle the power. So you do, you clip the amp and you blow the sub. But if you hook a 1500 watt amp to your 1000 watt subwoofer then you know that you have more than enough power to blow the sub so you will take it a little bit easier on the gain and the volume.

[@charlesuh60m]

@@DIYAudioGuy thank you for your advice! That makes a lot of sense. Now I just hope my stock 110a alternator can handle it lol.

[@nickrose8733]

@@DIYAudioGuy JL Audio manual clearly states that it is better to use an amp that is less than the continuous RMS rating so, for a 500 Watt speaker, use a 300 Watt amp. In fact, it states that the lower the amp wattage, the less change of damage, but that the performance may not be as good. I don't really understand how you can blow a subwoofer with a low wattage amp, even if you turn up the gain. A company like JL Audio would hardly give advice that may potentially cause failure on their speakers, so, I am not really sure where this myth of using higher wattage amps than the continuous RMS rating comes from, but many people believe it.

[@pkennedy4256]

So if you're using a sealed box should you just turn your subsonic filter to zero?

[@Komunalaren]

Hey i wanna try play lower music on my amp and subwoofer, i have avatar atu-1000.1d 1000w 1 ohm and 2x12 inch subwoofer ported sub, Dimension 900 x 350 x 370 / 250 mm can i play lower hz on that sub or do i need better sub?

[@DIYAudioGuy]

That's a very big question! A little to big to answer in the comments section.

[@DIYAudioGuy]

But hey, this might help. Start by getting yourself an inexpensive measurement mic and an app on your phone so you can actually see how low you are playing. This video may help kzbin.info/www/bejne/baDVe6Ksob2peK8 then check out this video for more information on how to tune your box lower. kzbin.info/www/bejne/Y6rSoYekmrhqnZo

[@Komunalaren]

@@DIYAudioGuy thanks for help i will try do that :D

[@thekidbart4528]

I have a Skar audio 12 inch box and it’s tuned at 36hz, in it I have Crossfire C3 and I have my subsonic at 29hz…should I drop it some more? I used the SMD CC1 to set it at around 29hz on subsonic….should I do 25hz instead? Some help?

[@DIYAudioGuy]

.75 * 36 should give you 27 Hz.

[@thekidbart4528]

@@DIYAudioGuyI did set it at 28hz being that the CC1 doesn’t have the 27hz test tone.

[@anthonymann9975]

Young Mann I’m trying to play CATCH UP with all your very informative videos I have some RFD 2208 Rockford’s that have been in hiding in my closet that need to come back from the DEAD !!! Hook me up on what I need Please

[@DIYAudioGuy]

At the very least you will need an amp, if you want to go with all RF then get this one: howl.me/civ4Tfeo2ld For the wire kit I recommend NVX, excellent value especially if you use the diyaudio10 discount code. bit.ly/3bGLITB

[@Brian1.]

Coolness

[@DIYAudioGuy]

You know it.

[@kristicarhomeaudiosystem47]

What is best for a Subwoofer 80hz or 100hz? and which is strong bass 80hz or 100hz?

[@DIYAudioGuy]

Depends on the subwoofer and the rest of the system.

[@TheChrisGrib]

Do we tune it to the Hz of the ported box? Or the Hz of the subwoofer. What if they are different?

[@DIYAudioGuy]

Use the frequency of the box. The two numbers you are talking about (FS and Fb) are completely different things.

[@jacobkauwe5573]

Hi how do set my sub amp if I have a processor and an epicenter

[@DIYAudioGuy]

Turn off the crossovers and infrasonic on the amp and use the ones on the processor.

[@beatmaniaboy]

+1 for the dayton ultimax series, 1 12 hits harder than my 2 10's even with it being on bridged mode on an audio control amp,

[@DIYAudioGuy]

Dayton is a hidden gem, good performance and a reasonable price, more people need to know about them.

[@xxxYYZxxx]

I use a 600w 12" Ultimax in an undersized 1.25ft^3 sealed box - as large as I can fit, so a realistic vented alternative would be a ported 300w 8" Ultimax. The Ultimax is a great sub for the RMS level it's built for.

[@over-there]

I want large xmax and a large speaker, say 48 inches wide, what wire size for a 16 inch voice coil

[@DIYAudioGuy]

Note sure if anybody sells one that big, but this one is pretty close: lddy.no/12scz

[@IfawXVI]

If i'm using a sealed box, where do i set the filter to? It goes from 20Hz to 50Hz, no on off switch.

[@DIYAudioGuy]

With a sealed enclosure you probably don't need one. So set it at 20 and see how it works.

[@tonybologna139]

Where would I set my low pass at?

[@gueroburban4989]

I’m tuned to 32 hz I have a single 12 skar evl in a 2.0 cubed ported box what should my subsonic fikter be around? I have it at like 30 hz

[@DIYAudioGuy]

I explain that in the video!

[@gueroburban4989]

@@DIYAudioGuy I’m asking you so you can tell me? Asking fir a reason

[@rotweilerdc]

@@gueroburban4989 He explained it in the video

[@letid9422]

24hz

[@cbeach187]

So if my ssf has a 24db slope I would multiply by 0.251 correct?

[@DIYAudioGuy]

Yep!

[@cbeach187]

@@DIYAudioGuy I set my ssf filter with the 0.251 formula from your other video. I had been previously using a smd cc1 to set my filters and this method hands down sounds better. The dials setting now my ssf is up higher and my low bass sounds amazing an 0 bottoming out now . I believe the cc1 had me way under tuning.

[@luissalmeron8696]

Where do you learn this type of knowledge. What school would I have to go to?

[@DIYAudioGuy]

I just read a lot.

[@monstah408]

My amp at 12 slope should I multiply with the .501 ?

[@DIYAudioGuy]

Yes

[@monstah408]

@@DIYAudioGuy awesome , thank you for the videos !

[@user-rq4th6ql4g]

Hey buddy I’m not to sure if u answer to comments but I have a quick question if u don’t mind. I have a potted enclosure 2 12 inch jbl 1220b woofers theyre rated at 34-200 hz with a sensitivity of 94. What would I want to set my subsonic at? I’m kind of confused if u could help me it would be very much appreciated. Keep up the good work boss. Just tuned my gain with your method

[@DIYAudioGuy]

If you know the tuning frequency of the enclosure multiply that by 0.75. I'm guessing that you probably don't know that which is why you're asking. So I would suggest trying it at 25 hertz and see how that works.

[@user-rq4th6ql4g]

@@DIYAudioGuy yea unfortunately I’m not to sure where to find the tuning frequency I’ve tried to look online but can’t find it I’ll try 25hz and see how it is, I’ve put my low pass at 80 to be safe too. appreciate you helping me out! All love keep grinding! Your videos r very informative and entertaining

[@HOLYJIGGA]

Good Afternoon! What Does It Mean When My Subwoofer Cuts Out On Certain Basslines Or Certain Lows & How Can I Adjust My Amp To Prevent This?

[@DIYAudioGuy]

That usually means you have a loose wire. check all of your grounds check all of your power connections check all of your speaker connections.

[@bobbygarcia8372]

all audio components are factory tested wired. Also to test an output of your audio component should also be tested wired in the vehicle. Although it was stated this is for fun and entertainment

[@Chromedome-ss6mg]

It seems like big loud systems would move the adjustments with all the bass.

[@Bighotwheelhunter]

How come my sub pop when I higher my lpf

[@DIYAudioGuy]

It's hard to say, start by making sure your gain is set correctly. kzbin.info/www/bejne/mV64hXRrbtWZhqM

[@THESUBZILLA]

"but honestly how often do you play notes that low" EVERYDAY!! lol I'm a low bass addict...

[@DIYAudioGuy]

I like the lows, the infrasonic bass that you can't hear. Most people are not. Very few car audio guys tune their ports lower than 30 hz.

[@THESUBZILLA]

@@DIYAudioGuy haha yea, I got a 6th order wall, 2) 18s on a MD12k, rear tuned to 18Hz, it's very windy...

[@DIYAudioGuy]

That sounds like a load of fun.

[@THESUBZILLA]

@@DIYAudioGuy it is very lol. great video btw!

[@MikeHensley-sc3ns]

I Slapped the sub button right there… subs a slapping.

[@carlosyounger5449]

Ok so if my box is tuned to 40hz my sub sonic should be set to 28hz right? here what I have 2 10x4mofos at 1ohm box is tuned to 40-42hz but now I'm confused on where my lpf and sub sonic should be I thought lpf should be 40hz and sub sonic 28hz but now I'm lost can you help please

[@carlosyounger5449]

Sorry amp 1500.1 class d with 24 db slope

[@DIYAudioGuy]

I would put the low pass filter at 80 hertz and the infrasonic filter at 30 hertz. Since you're using 24 decibel per octave slopes you might be able to get away with 100 hertz for the low pass and 25 for the infrasonic. As always your ear is your most important tool. But doesn't sound good big a different crossover point/slope.

[@carlosyounger5449]

@@DIYAudioGuy ok so last question I'm running (2)10s 1200rms each 4ohm DVC so 2400rms at 1ohm final with my amp being 1500.1d 24db slop and box seems to be tuned at 40-42hz I did the square root of 1500 x 1= 38.72 is this right and if so what tone should I use to set it a 40 or 50hz or should it be something else

[@carlosyounger5449]

@@DIYAudioGuy also if it helps my x max is 15mm and mech is 21mm fs(hz) is 29.63 QMS 5.6 VAS(ft³) .869 QES .45 RE 7.24 BL 24.44 QTS .42 SPL(1w/1m db) 83.4 that's all the info I have on subs

[@DIYAudioGuy]

@@carlosyounger5449 It's all based on the box tuning frequency.

[@supernintendo9398]

I have a question, if the box is sealed but you have 2 subs facing 2 others in a single box, why can I reach x-max easy without subsonic "amps nob name" they are push the air together. So it gets pretty high pressure in that box hahaha

[@DIYAudioGuy]

I'm not sure what you mean by two subs facing two others in a single box. But in general sealed enclosures don't really need an infrasonic filter. That's not an absolute truth, just the general trend. The air inside of the enclosure acts as a spring that makes it harder for the cone to move.

[@supernintendo9398]

The front and back of my box have subs. But they are inverted for box space and cooling@@DIYAudioGuy

[@FunHobbies225]

my sub is tuned to 32hz what should my sonic filter be at? about 40hz or 20hz

[@DIYAudioGuy]

24

[@FunHobbies225]

@@DIYAudioGuy thanks my half way mark on sonic filter is 25 and it goes to 50 on my DC audio amp 1.2k so pretty easy to figure out where 24 is.

[@NoPainNoGain___]

​@@FunHobbies225 i just got the same amp recently how's it sound what you think about the dc 1.2?

[@FunHobbies225]

@@NoPainNoGain___ its amazing amp dont get barely warm and puts out clean power will last years and years with no problems.

[@NoPainNoGain___]

@@FunHobbies225 that's good to know!i just got them installed last night very good so far and one solid ass amp 👌

[@markcasillas2166]

Quick question,this really doesent pertain to the video but,here on you tube when there showing the cars and truck with mega bass,are they okaying music in slow motion or,whoever making the videos edit it like that?

[@DIYAudioGuy]

The KZbin copyright system is complicated. a lot of times you can't hear anything that sounds remotely like music when people are doing bass demos on KZbin, so the algorithm can't match it and the owner of the music can't really discern if it's theirs or somebody else's. Sometimes you get a copyright strike and KZbin will take the video down. Sometimes the owner of the copyrighted music will make a copyright claim, the video will stay up but any ad revenue from KZbin goes to the copyright owner. If you get three copyright strikes KZbin can take your channel down.

[@markcasillas2166]

DIY Audio Guy I kinda thought so but wasent rellly sure thank you for answering,I’m just starting to get into car audio and by far sir I think your channel is great,i like how you cut right to the point and talk+show what is what,why is why,and how is how lol,please don’t change how you run your channel it’s awsome the way it is,looking for on many more how to videos,me personally I have have. 2016 Jeep Cherokee trailhawk edition,keeping oem head unit but everything else from dash to trunk is after market,I’m running LC7i by audio control,have 4 coaxel 6x9 fosgates doors two 3,5 fosgates dash, 4 channel 760watt pioneer for highs, two p3d4-12 1200.1d fosgate for woofers,don’t like the fosgate mids and 3.5 sound really distorted,was thinking to up grade kids and highs with components system,tell me your thoughts on my systeam,what you think I can do to make sound better,what you think is overall better component systeam and one more,would you happen to know about the jumpers inside thebLC7I? The summing confuses me on how to set up and honestly thinking to just run dsp,again thank you and looking forward to hearing from you,

[@DIYAudioGuy]

That is a lot to take in! I'm not sure if I can really answer it fully in KZbin comments. Let me start by saying that you've got an awesome ride. The downside is that it's very difficult to integrate into a new factory radio. I personally would have looked into an amp pro. I think they make them for Fiat Chryslers vehicles. The anmp pro does not look like much But if it is compatible it is the best way to get line outputs from your factory system. They come with a T harness you literally just clip them in and you get six channels of full range RCA output. As far as the distortion goes from your current speakers, you probably need a higher crossover frequency. I'm not a big fan of throwing three and a half inch coaxials in the dash. I think you would be a lot better off with a component system. If you hav seen my three-way installation videos you know that I have a wide band driver in the dash location and a tweeter's surface mounted on it on the dash. I honestly think I could get away without the tweeter. Having said all that, I don't recommend that you spend any more money. I'm just not a fan of throwing money at problems. Instead you should play with your settings, any equalization or crossover features on the amp and the LC7i. Tinker with it until you can get it to sound better, tinker some more and see if you can get it to sound great. If that doesn't work then you might want to consider switching out gear. I appreciate your kind words and the positive feedback on my videos. I have a lot of fun tinkering around with audio projects and I want to share the hobby with the world.

[@markcasillas2166]

DIY Audio Guy awsome well thank you for the advice,and as soon as get get off work I’m gonna look up that video you were talking about,keep the good work,If I wanted to learn more about car audio installation wise do they make books I can study do they have schools I could go to RB best to watch how to videos

[@DIYAudioGuy]

Outside of KZbin there aren't a lot of options for the DIY training. There is a professional certification, and they publish books. I'm not sure if they just let any random person buy them. mecp.com/

[@carl3820]

Dude. I know your reading a pre script explanation but you gotta do us a favor snd Slow it down dude lol. I know it’s easy to cruise along when reading but don’t forget people are trying to watch your video and learn. When your flying through stuff it makes it very difficult without rewinding s million times. Just a little friendly advice. Maybe it’s just me lol. But thanks for the info. From what I can retain and understand it seems useful lol. Thanks again.

[@DIYAudioGuy]

Thanks, that is useful feedback.

[@rotweilerdc]

Just rewind the video chief

[@DjR3aper]

there's a speed button. watch em at .75x

[@pathaha4870]

bruh he did nothing wrong and dumbed it down you must need school

[@pathaha4870]

AMAZING VIDEO YOUR JUST SLOW

[@cobe1mllc]

Dunder Mifflin Assistant to the regional manager

[@DIYAudioGuy]

👍

[@Live_Loud]

What if my amp doesn't have subsonic filter?

[@DIYAudioGuy]

A lot of amps don't have one. Some amps have a preset one from the factory with no user adjustable controls. You'll need to check your owner's manual to verify. If your amp does not have one, and if you think you need one, then you will need to either swap out the amp or tune your subwoofer enclosure lower.

[@Live_Loud]

@@DIYAudioGuy can't swap amp as I brought it yesterday only and tuning frequency below FS will reduce efficiency. I have pioneer AVH-Z5090BT but unfortunately head unit doesn't have subsonic or dedicated HPF for sub out which should be there! 😅

[@DIYAudioGuy]

@@Live_Loud A lot of people never bother with the infrasonic filter. If you're really worried about it then model your enclosure in WINisd, or just go easy on the volume if you're playing music with a really low bass. Don't play a 20 hertz test tone at full tilt, that kind of thing.

[@Live_Loud]

@@DIYAudioGuy I generally listen to decaf which is bass boosted music which has lots of lows! Anyways I'll be careful with the volume. Thanks a lot for prompt response.

[@DIYAudioGuy]

No problem!

[@FinsleysCustomCarAudio]

Keep bass boost off?

[@DIYAudioGuy]

Yes!

[@RealRemixYT]

I have a Ken wood amp with the exact same thing how do I set it up for a 600watt subwoffer with a 4 ome it’s supposed to be 2000 watts the amp but it’s constantly pulsing with the woffer please let me know

[@RealRemixYT]

Btw it’s a 10 inch woffer

[@DIYAudioGuy]

It's probably the exact same amp. "Max" power is 2k, but RMS is 1k. Here's a video, toward the end I show you how to set up an amplifier when the amplifier can produce more power than your speaker can handle. kzbin.info/www/bejne/g3PGeIKlh69niNE

[@TheUltimate65]

Subwoofter Amplifers with and without subsonisk filter its the difrent og night and day

[@unbanmy360]

most infrasonic filters 12-18db? It's 6db??.708 in voltage I believe this is correct. I haven't double checked at max power it was set at half volume as shown here for 40fs driver 32hz tuned set to 24hz

[@DIYAudioGuy]

You should be good. You can always make adjustments after listening.

[@unbanmy360]

@@DIYAudioGuy what would also work a roll of r15 or less for a buck

[@TheOnlyJoshH]

I’ve watched this twice and I still don’t know what to do xD my Memphis amp has that knob, and idk how to tune it, I just turn some knobs and it sounds good to me lol but that doesn’t mean it’s good for my subs

[@DIYAudioGuy]

If you like the sound then it probably OK, that is the most important thing.

[@TheOnlyJoshH]

@@DIYAudioGuy okay good, thing I worry about most is ruining the subs haha.

[@sermac3246]

👍

[@DIYAudioGuy]

😎

[@gsxroyce256]

An easier way to set it, is crank it up with a 20 Hz test tone and than turn your infrasonic knob up until the voice coil stops slapping the back plate of the magnet lol 😂 jkjkjk

[@ishuacardenas3505]

I need a video that dumbs it down a little this Is complicated

[@DIYAudioGuy]

Which part is complicated? I might be time to make another video on the subject.

[@AxelsPokedex]

We have the same haircut

[@DIYAudioGuy]

Hell yeah brother!

[@hectorortega9131]

Very interesting info, but you are going way to fast for the guys that wanna learn.. thanks any way.

[@anthoniewhittington7342]

Just goto your video adjustment on top right of video ajust playback speed slower for u to keep up and good to go. Your welcome 😌

[@hectorortega9131]

@@anthoniewhittington7342 great idea! Thanks Mate.

[@anthoniewhittington7342]

No problem happy to help out

[@heyimclancy]

@@anthoniewhittington7342 it really depends on everyone, this is the perfect length for me, as I'll go back and listen to each section and slow down from there

[@matk22]

Infrasonic and subsonic and two totally different things.

[@DIYAudioGuy]

In this case the correct term is infrasonic but almost everyone uses the term subsonic.

[@evilinside5984]

@@DIYAudioGuy Since im looking for reduction/limiting of freq. in the 10Hz to 19Hz range, then in my case it would be called a subsonic filter, right? But for anyone looking for reduction/limiting of freq. In the 20Hz and up freq., would be infrasonic filter?

[@DIYAudioGuy]

@@evilinside5984 subsonic means slower than the speed of sound. Infrasonic refers to frequencies that are too low for the typical human being to hear. It's one of those situations where the commonly used term is the incorrect. It's just a high pass crossover set to a very low frequency.

[@alphaomega8373]

His daddy calls him subsonic, so imma call him subsonic.

[@2002ZRX1200R]

If they can't reach the lows, they are only woofers lol.

[@DIYAudioGuy]

For sure!

[@PsyDei]

I didn't understood a word. Probably I don't need a Subsonic filter.

[@DIYAudioGuy]

Most people don't use them and a lot amps don't have them.

[@jbwright0162]

Didn't understand this can someone please make it simple

[@ijonnypro]

No worries bro I got you. Plug in your port tune number instead of my example one. 1. What's your port tuned to? Let's call it 32hz (change to your tune) 2. So, 32hz × .75 = 24hz (so you need to play a 24hz tone) 3. You want your dmm plugged into pos & neg speaker terminals 4. With the tone playing, adjust the volume on your head unit until it's reading 10v on the dmm 5. Now you can set the ssf, adjust the ssf on the amp until the dmm reads 7.08v (You wanna get it as close as possible to 7.08v, but it won't hurt the subs any if you can't get it exact & it's reading like 7.05 instead. After that you're good to go man ssf is set Side note: if you can't get the volume to read exactly 10v, he did it for easy math. The equation is 10v × .708 = 7.08v. So, you can replace 10v with whatever number you're closest to then multiply by .708. That becomes the number you adjust the ssf to on step 5. I'd try to get 10v tho it's a much easier number. Hope this helps man 👍

[@pleasedie4me386]

Way too fast. Very usefull info, but i cant keep up

[@DIYAudioGuy]

Trying to keep it exciting. Math can be dull.

[@FinsleysCustomCarAudio]

On a Subsonic Filter 20hz - 50hz What would it be at 12:00 position? 35hz? 20+50=70hz 70/2= 35hz Thanks for anybody that can’t help me figure it out.. Also, LPF 20hz - 200hz Half way would be 110hz and 9:00 position being 55hz?

[@DIYAudioGuy]

You can't really trust the markings on the potentiometers. Play a test tone equal to the frequency where you want to set the crossover and follow the instructions in the video.

[@olveramelinda]

I’m lost 😑

[@DIYAudioGuy]

I know the feeling!

[@olveramelinda]

@@DIYAudioGuy I kinda figured it out. Sound good now

[@Slumericannandit83]

Will u please just come tune my amp and build me a box already 🤣 i feel uneducated watching your videos 🤦🏻‍♂️

[@gilbertloza3383]

Learning is cool but fuck

[@DIYAudioGuy]

Learning new things ain't easy.

[@ricardogaribay954]

All a waste of time just none sense,,,,all good if your a technician,,,,,,average person would just like to see a simple video an how the sub moves and sound by adjusting the sub sonic

[@DIYAudioGuy]

If you really want to know what it looks and sounds like feel free to make those adjustments with your own amplifier. Just don't come crying to me when you damage your gear.