How To Set Amp Gain to Match Lower RMS Subwoofers? | Car Audio Q & A

[@Joshuazico]

I love when someone explains something so i can actually understand instead of wasting time rambling about nothing

[@cloudnine5651]

too bad it wasnt true

[@jmc1127]

Alan I've become a fan and subscriber of the channel over the past year and its always impressive when a host will not only answer the question but "take it a step further" to test the theory and alleviate ALL doubt! Well done and keep up the good work! JMc from Big D!

[@freakenstein1991]

Damn bro, shoulda been a teacher. I followed along attentively the whole time. Great work.

[@aaron71]

right? me too, and i sucked at school.

[@si-mt6pl]

Damn Waldo I haven't seen u since elementary school in the 90s.

[@dustinmoore1650]

1991 2.0si that’s because you couldn’t find him. He was there all along, the whole time.

[@NoLoveinHell]

well you weerent trying to install subwoofers in math class lol

[@jaygold14]

@@NoLoveinHell lol true

[@TheBarrios69]

Man!! You saved me the hassle of doing the math. The last(I was hoping you would do the equation) 600x2 equation and you made my day and night! Thanks so much. Usung my volt meter tomorrow to get 34.64 on my Xtr orion 1500.d

[@buscojosenjuarezdenuevoleo9669]

What is the second math after power x ohms = let's suppose is 1500 waats Amp x 2 ohms =3000 then what?

[@liberalsarethebiggestcryba6654]

@@buscojosenjuarezdenuevoleo9669roughly 54

[@robertstorms6203]

I was literally just looking for this info and it randomly popped up on my recommendation. Thanks for the help guys.

[@lowhertzhighspl]

Of course, that's because Google owns KZbin.

[@justinflorek5369]

Great video, and thank you for explaining it. I was curious watching this, why there was a variation. The voltage was slightly low and the wattage was a little high, (it was 16% off). I then realized that wattage was amp dynoed at 13.2 volts, and the gain was set at battery voltage ~12 volts. When you take that 334 watts, and divide by dyno voltage to get your amps, then multiply the amps by voltage you set the gain at ~12 volts, it comes out exact.

[@metaldreams3595]

Hey, I forgot, when he says Ohms, is he going off trhe Ohms of the Sub or what were wiring it at? Cosw my Sub is 2 OHMS but its wired for 4 Ohms

[@tonydize3944]

Most people only show you how to set it to clipping point instead of matchin the power to subs like this man does great job I know that's an old video but it continue to help people

[@miguelanguiano4218]

That’s how I did my adjustments. I like this. Question do I need to have a certain track on before turning up the radio?

[@miguelanguiano4218]

Oh I see needs to be a test tone. How do I get a test tone?

[@bingdong8571]

They still make kenwood! I dont do car audio anymore, good to see there still around. i wish they would return to home audio

[@blade4363]

Great video but what I have always done is turn the volume up on the head unit to just before distortion and then increase the gain on the amplifier until I hear the sub a start distorting and then back off The Gain Slightly

[@scootdawg3535]

that's how i do it!!

[@vitaminb4869]

Yeah, but here we are trying to set amp to 50% of its max output (assuming 600w amp and 300w sub) to match the weaker sub. Otherwise, you're sending too much power to the sub and will overheat/kill it eventually.

[@JWard2]

And in doing so you leave opportunity for the subwoofer to blow. That old method is close but not perfect

[@numinous4789]

When you do this, apply your amp changes when the car is running. A fully charged battery is only ~12.5v. When your car is running, you'll see ~13.4-14.4v, depending on your voltage regulator. DON'T use this method with the car off, otherwise when your car is on and you're actually pushing, say, 14v, for instance, you'll be over your RMS power goal. Also, check the actual impedance at the speaker wire ends. A wired 2-ohm sub may measure 2.4 ohms, or it could measure 1.7, etc. Use measured numbers instead of theoretical ones when you use the equation.

[@akfhjfughjgh]

Numinous shouldent the meter be set to DC when checking directly from car battery?? Not AC how he has it in the video??

[@aaron71]

No, because you aren't measuring the DC voltage from the battery, you're measuring the signal the amplifier is creating to send to the speaker.

[@cekpi7]

There is difference between resistance and impedance, how would you measure impedance? At what frequency? As general rule of thumb just use 2 ohm for 2 ohm sub, since impedance changes with change in frequency, also box rise can affect that too

[@troydefond2307]

What about setting gain this way on a set of NVX JAD 1200.1 amps. I know the master is where I will set all the gains, and the slave amp won't need adjusting. However where should I stick the Digital Multimeter leads and will it be the same formula as stated above. I do not have access to any expensive equipment just a multimeter.

[@FrostyBud777]

Put the leads where your negative and postives wires for you subs go. turn to ac voltage , and your good to go. (play a 50 htz test cd and put gain from 0 to where it reads for your math)

[@lowhertzhighspl]

Shouldn't we first measure the speaker's Ohms/Impedance and use that precise number? I ask because my system is set-up to be 1-ohm but on my DMM it shows to be measuring at 1.4 Ohms so would it be better to use 1.4 in the equation rather than just the stock "1" Ohm? 5,000 x 1.4 = 7,000 sq rt = ~83.7 V versus 5000x1=5000 sq rt = 70 V resulting in a difference of 13 Volts which may mean the difference between distortion/clipping or clear power. Right?

[@Elemino]

Impedance is typically nominal, and the reason for that is the resistance of a coil (such as the voice coil in a speaker) changes as the frequency played changes. Another factor with voice coils is the magnet itself inducing voltage into the moving coil, further having an impact on resistance. So, no, not really. What you measure at DC with your multimeter is only accurate at the given moment while nothing is happening.

[@Youngtruckerdee]

I had 2 audio pipe 15’s wired at 2 ohms on a 1200w hifonics 1216D.1 amplifier that’s 1 ohm stable at 1200w. I was powering it with a 700w second battery that’s connected to my main battery . I was told that wiring the speakers at 1 ohm would increase there output and i did and they sound the same. Shouldn’t they be louder because there getting twice the power?

[@jesusloveyou9523]

when I see math my mind go blank lol

[@jesusloveyou9523]

Have no idea Bro just turn the knob until u hear bass 😨

[@Jasiel.95]

Lmao 🙋🏽‍♂️🙋🏽‍♂️

[@latola7204]

Lol turn until u smell smoke then back it off haha

[@mr79109189]

@@latola7204 When it claps lol I mean clips how long until you smell smoke I wonder?

[@sethh8892]

This is the most basic of basic math how could you mess this up?

[@DatSQ5]

Thank you for this, I have a Memphis PRX-A1500.1 and have a CT Tropo XL coming in so I only need 1000RMS not the full 1500 this video is gonna be a masssssive help.

[@gilbertogutierrez6027]

Would you guys mind making a video about different test tones (0db, -3db, -5db etc. ), explaining the difference between them and explaining gain overlap. What it is and how we can use it. I'm sure it would be very helpful for a lot of people. By the way, great video!

[@danielteo4785]

7 years later it's still super helpful. I have 2 harbour freight DMM and i couldn't get to read. I just saw that the red probe connects to the top slot. Edit i tried this method and still reads 0 to 0.2V on ACV. Don't know what I'm doing wrong.

[@CedricPledger]

This video is clutch. Thanks bro.

[@alanstant9356]

I knew about ohms law, just didn't know to use it in my installs. I don't have an amp fun, so I would have to hope the amps don't distort. Thanks for showing me man.

[@DaviWalt]

I used this video to match my gains, and it sounds great. But what i don't understand is why the gains setting was so different from setting it by ear ?

[@STK10VA]

The OzWalter did you use the impedance of your wiring or the impedance of your speaker?

[@PapaGuapo]

LooseKanin which are you supposed to use? The ohms after wiring or of the subwoofer itself?

[@leighkapp6298]

Nnpo

[@johncoruna]

Excellent explaining. I've never seen any car audio installer doing this... Lame. Great video! Thx

[@210Designs]

Allyn, thank you for explaining this for me. I will be sure and use this information, in all my future installs. Sent this link to everyone I know. #rockstarstatusnow

[@SonicElectronix]

Bj Hammon Thank you for the submission, it was an awesome question!

[@ricardocontreras8763]

+Sonic Electronix I have a performance technique 2 channel amp and p2 punch 12 how do I tune with multimeter

[@kurrentevent]

wwill the amplifier automatically know what ohms your trying to achieve once you plug in the speakers, or would you have to set the amplifier at the ohm you're trying to get? does that make sense?

[@DR-um2bv]

Kurrent Event the amplifier will automatic adjust to the speaker ohm. it will be trying to produce as much power as possible , but something is in the way, the speaker . the more it has to struggle (resistance / ohms of the speaker) the less it can produce, the lower the struggle (ohms ) the more power it can produce. so actually an higher ohm speaker keeps your amp from working too hard. but a lower ohm speaker will say " hey buddy if you think you can handle it go right ahead knock yourself out ".

[@jamesf9610]

Sonic Electronix want to make sure I got this right. If I'm running two subs bridged to mono at 1 ohm and I want 800 to each sub I would use 1600 correct.

[@AldenPez]

Watched this video a while back and used this method to set the gains on my amp. Thanks for the info!

[@PhiMobileSounds]

Don't forget to set your crossovers before testing so that you can read your 50 or 60 Hz test track.

[@XX-121]

and maybe try playing something else just to double check. also the reason the wattage could be slightly more or less than your calculation has to do with your input voltage and how your amp handles that. most will put out more wattage when the cars running and your alternators pushing 14.4 instead of 12 when it's off.

[@zakuraayame5091]

This also proves the inefficiency going from 4 to 2 ohms; while the math shows double, in reality losses inside the amp prevent that/ I feel it shows you should err on the side of caution, as the first two were quite a bit over the target of 300, and depending on the quality of your speaker, you might not want to give it 15-20% more RMS than it is rated for consistently. A better idea would be to properly match your amp and speaker. Measure true impedance would give better maths, as you are calculating with more significant digits (ex: your '4 ohm' speaker might be operating at 4.2 ohm). In the video, the math says the 2 ohm test showing 334W @ 23.8V, the speaker has an operating resistance at that Hz of 1.7 Ohm. The 4 ohm test showing 345W @ 34.6V, would dictate the speaker was running at 3.47 Ohm; while the 600w result is almost spot on 2 Ohm. Since this was being run on a test bench ... it would tell me that it is not as accurate at lower power levels, either in its ability to detect wattage, or its ability to provide specific resistance levels; if there isn't information causing this we are not privy to. Understand the theory, then use logic and critical thinking skills to apply things practically for your set up. Every amp and speaker is different, adjust appropriately for yours by gathering as much information as you can and using it to your advantage.

[@cbr1thou]

So I will ohm my leads before I disconnect thanks man

[@MichaelBeeny]

As a general rule if the sound is clean, nothing is being stressed!! that's all you need to know.

[@ratykat]

Agree'd, but with loud bass not everyone can detect distortion lower than 30hz (which is what a lot of cars are tuned to here in the UK) and plenty of people think the gain knob is volume :/

[@dopeminguez24]

Michael Beeny old heads always have to hate on everything they see simply because it's not being done their way..

[@andrewjohn6853]

yeah its not always obvious to the ear that a sub is clipping

[@el_taiito5492]

Subwoofers can be burned without clipping.. not always right.. depend of the sub

[@highspeed9518]

Unregulated amps bass boost and voltage drops account for 95% of blown subs

[@ascap2854]

Thanks this helped a bunch. I have a Skar audio rp1200.1d on a single Fosgate P3 600w and didn't want to blow it because really can't afford another.

[@darkday1702]

Awesomeness...was looking around how to do this. Thanks for the info :D 2000 watt amp to 1200 watts@1ohm incoming.

[@johncarnahan3992]

I got confuse so I just hooked my speakers straight to the battery and it works great!

[@chriscape3136]

this was the most informative video I've ever seen on this subject, I already knew the method intimately, but I've never been able to explain it, I'll just show this video, thank you

[@AmericanSmallArms]

Einstein: “If you can't explain it simply, you don't understand it well enough.” 😉

[@cloudnine5651]

uhhh....this isnt true. wtf are you going on about?

[@d3vilman69]

Hi I know this thread is 2yrs ago but hope can still get a response :). In the video it was shown the HU vol was set to max. With the amp gain at minimum, the amp output already has 15+ Volts. Based on the equation the amp gain is increased till voltage reaches the target value => HU is matched to the amp. This, I understand. Now, we know that speakers should be operated at or near their rms power output levels to sound their best without distortion. But after making the HU match the amp, note that the HU vol was set to max - but we don't listen to normal music at this max vol of 35. Say we lower volume down to 17 which is comfortable. Question 1: Does the lowering of HU volume by half drastically reduces the amp channel output voltage such that it no longer meets the target matched value, meaning the speaker operates at much lower rms than intended? Question 2: Suppose I have a 4-ch amp that pushes 120W rms @ 4 ohm per channel. I connect it to four 4 ohm speakers rated at 50W rms. Based on equation target voltage is sqr(50x4)=14.1V per channel. Is it possible that, at minimum amp gain, the channel output voltage already exceeds the target voltage?

[@danielmcbride2383]

the reason why the head unit was turned all the way up is because once you set the game to the right level that's the make sure that when you turn it up all the way it don't blow your subs it will not hurt it after that if you only play your music at half way and yes it's possible for the ant game to be turned all the way down to be pushing over 14.1 volts are 15 volts

[@COURTNEYLOVELIFE16]

So what if you have 2 subs 650 a pice and run at 1 ohm do you just multiple by 1

[@auzcr]

phantom gaming i have the same question

[@beardedforlife3740]

Double the watts and multiply buy one or use the rated rms for one sub and multiply it buy what that sub is whether it be a 2 ohm or 4 ohm sub

[@vitaminb4869]

2 subs * 650 = 1300 watts at 1 ohm.

[@Tony-tk4ht]

I have 2 subs 500 rms run at 3.360 ohm. The result i get for one is 40.98 volts, would i multiply this by 2?

[@darrelrichardson7040]

thanks bud. new to the audio world and this helps

[@brianc.4425]

This video helped me out immensely! I used this technique to set the sub gain as well as the 4 channel with a 1kHz tone, and the results were phenomenal. The bass sounds great, but even more than that, my cabin speakers (all Type R) sound the best they ever have. I'm hearing details I've never heard before, and with all 4 set properly, there's a synergy and a chemistry between them and I believe I'm hearing them the way they were designed to be heard by Alpine. It's also a great feeling to be sitting in the driver's seat at the stereo controls and knowing that everything is set as it should be, and being confident in knowing how much headroom I have when listening to music recoreded at slightly different levels because I saw the DMM readings for myself rather than having someone else do the install for me. Thank you guys so much... you're the best!

[@fazjewls14]

Great explanation. You should do one while in the car. Because your using a 16v system in AC. So hope you make one in 14v with DC in the car

[@MrBigR928]

Just locked in on your vidz yesterday and your good at your craft no doubt. The whole game has changed since i was bump'n. I had 2 Punch 15's, 2 Three way sony 6x9's, 2 four inch Altecs with a punch 150 on the woofers and a punch 30 on the highs with a XV-1 cross over in a 1986 Toyota Tercel 2 door hatch back with a pumped up alternator and Maaaan i was bump'n ya herd me? Lmao! But now I'm older with a Kenworth W900L that came with a bunch of Memphis brand goodies but an old Audio Bahn amp. So i wanna make sure everything is matched up and running cool. I also have a 2005 Chevy Trailblazer that i wanna throw alittle sump'em in too. So thanks for doing these vidz. I'm not looking to do crank up's but i want my thump nice'n clean😎✌

[@selectorerwin1don12]

Wonderful video is this same method apply to 110v amplifier ??? Best way to calculate ever thanks

[@Makukeisari]

Before watching this i was constantly setting the gain because the music sounded wrong and bad quality. Today i took the time to properly set the gain with this method, the difference is huge! No matter how loud i want to listen, it never sounds distorted and the actual music quality is superb! :)

[@fallenone6]

Do you set the gain matching the ohms of the sub in general or the ohms your wiring it down to? I have for 4ohm but going to wire it to 2ohm. That is why I'm asking.

[@Romi969]

@@fallenone6 you have to match the gain to the ohms you're wiring it into.

[@fallenone6]

@@Romi969 thank you!

[@fallenone6]

@Romi would you also happend to know if say I have a 1000 watt amp and I have 2 500 watt subs and I tune it to 1000 watts will that split the 1000 watts and give 500 watts to each subwoofer?

[@OBARRVAGOS]

U can do it by ear also easy to set gain if u have a hatch type trunk like a van .

[@SlashtaCross]

What happens if you have multiple subwoofers? Like two 12’s ran to 1 ohm. Do you still use 1 ohm in the equation?

[@casey360360]

Yes. Electrical really is that simple.

[@xXGusDaBus75Xx]

@@casey360360 soooo... if you have both subwoofers RMS at lets say 600watts, do you use 600watts for the equation? I have a Kicker 1600watt mono block amp with two kicker L7T12 2OHM peak at 1200 and rms at 600 wired both to 2OHM.

[@casey360360]

@@xXGusDaBus75Xx if I understand you right, you're asking if you use one subwoofers max RMS handling to set amplifier output for 2? So in a circuit, voltage is shared across all parts, power is shared. If you have 2 600 watt RMS subwoofers, your peak output needs to be a max of 1200 watts. When calculating this from the RMS voltage on the amplifier output, you're using the total resistive load of the circuit, which in your example is 2ohms. Let's say you're getting 50Vac at your amps output (with speakers connected) with a 2 ohm load, you're seeing 1250 watts RMS.

[@xXGusDaBus75Xx]

@@casey360360 I have two DVC 2ohm 12s RMS 600 and peak 1200watt wired together to a two ohm 1600watt mono lock. Do I need to add the rms together of each for the equation or base the equation off of a single subwoofer.

[@atmosphericpressure3560]

I have 2 - 250wrms subs that are D2's. All that matters is the final load that the amp will see. 500watts x 2ohms=1000/Square root of 1000=31.622volts

[@tommyk4687]

Best explanation for setting gain ever!!

[@djbigbenjammin8954]

I have a question for you guy,if you can help me out with this problem. I have a kenwood radio kdc-x797,and I have had this head unit for about 6 years. And I have an "hf error 68" on my unit,I have tried to rest it and the hf error 68 still appears on the screen. How should I fix it?

[@HToWnRePPiiN]

it means it can't communicate with your cell-phone. You should cycle the power switch, if the error still shows press the reset button on the control unit.

[@simracingelite4004]

thanks man, i am using this method for a long time since i have watched your video

[@markymarkdidthat]

and how do i know my headunits voltage or if it distorts?

[@shanesubashe787]

Use a dd1.

[@geo6642]

best video and explanation with proof i've seen all day

[@blazethebong420]

What about for two subs? Say two 300rms subs at 4ohms

[@vitaminb4869]

It doesn't matter. You could have 10 subs and if the desired output is 300rms@4ohms, then that's what you should be setting it for.

[@nicholasgerman5376]

If both subs are rated for 300 rms then would 300 be what I’m going for or is 600 what I’m going for if I have 2 subs wired to 1 ohm

[@mrrolltideroll2018]

I have a 350.1 D amp pushing 2 800 w skar brought it down to .5 don't really understand how to set the app up not to clip out

[@efraingallegos2158]

I have a question, do u add your total watts if you have two. For instants two 4 ohms subs rated at 300 each (300+300=600 or 300 total)

[@blazethebong420]

Efrain Gallegos I'm wondering the same thing

[@OrlandoRamos95]

Efrain Gallegos same here

[@blazethebong420]

Orlando Ramos I added my total watts, I have two 300rms subs at 4 ohms, so I did 600rms x4ohms =2,400 and square root of 2,400 is 48.98. Set my gains to match close to that in volts and it sounds really good. Not sure if it's what you're suppose to do. But I did and it sounds awesome.

[@OrlandoRamos95]

blazethebong420 sweet, another question what do you touch with the multimeter, the positive and negative on the amp where the speaker wire connects to?

[@blazethebong420]

Orlando Ramos yes that is right

[@GregBird]

Good info to have... will definitely use this in the future.

[@srairmand]

didn't he used to work for soundman?

[@jasoncox7903]

Question... When you do have a bigger amp than the sub can handle. Are you missing out on the woofers potential or the amps sound quality when you tune the amplifier to match the RMS of the speaker???

[@rayray6422]

I have my cvx12 , 2 ohm sub wired in parallel to 1 ohm.... would that mean I need the square root of 750w(x1ohm) or 1500w(x2ohm)?

[@ibrahimraja9845]

Raymond Sheppard have u figured it out? I have a dual voice call sub at 4 ohms but when wired parallel its at 2 ohms so Iam wondering which i have to multiply by 2 or 4 ohms?

[@amargeddon2568]

Ibrahim Raja multiply by 2 ohms

[@ns5337]

@@ibrahimraja9845 2ohms , it"s whatever you wire it at the end

[@Sertao2013]

I don't know if what I'm asking has to do with what your talking about but here is my question . I just got the JVL ks-ax201 from you guys . On the back it has 3 things I can change . The first one is the input sens. In the instructions it has - set this control according to the line-output level of the center unit connected with this unit .For the line-output level,refer to the" SPECIFICATIONS " in the instruction manual of the center unit. This controller is preset to 5v when the unit is shipped . If my ddx9903s kenwood is putting out 5 volts does that mean I set the input sens to 5v ? Is what your calling the center unit ,is that the receiver or head unit ? Bass boost is the middle setting of the 3 and its Off low or high I guess I just have to play around with that to see what sounds best . The last one of the 3 is the LPF How do I know what hz to set this at it goes from 50 hz to 200 hz ?

[@Jaydee420]

hey man it all looks easy but where should my lpf be when i test it

[@OBARRVAGOS]

Jaydee420 Choose an lpf frequency that your subs can play .

[@RemainNameless614]

Not what your subs can play. It's what the box is tuned at.

[@austinduhon1510]

DCVR614 wrong

[@hellobooom]

the frequency where your midrange speakers roll off at, usually 80-100 , tuning according to box would be for a sub hpf (half octave lower than port tuning)

[@rebl7355]

Good question from "BJ"

[@briangill7177]

Thx

[@maskedreaper626]

I got a 98 grand marquis with 2 rockford fosgates r1s. And a 600 w amp with a 1200 w wiring kit. How would one go about gettin sponsored by you guys?

[@mikehayden2115]

Stupid question : is there a reset button or something on a solid audio amp, to get it out of "protect mode - red light"?

[@OBARRVAGOS]

Mike Weber unhook the amp let it rest for like 2 days . Then hook it back up . If it still does protect mode then something is wrong with the install . Prob wrong speaker to the wrong amp .

[@RemainNameless614]

Letting an amp sit for 2 days doesn't do a thing. When a amp goes into protect mode it could be a lot of things. Wired too low of ohm load than recommended, amp got too hot, blown resistor in the amp, not enough power to run the amp, etc. Does the amp have a odd smell like something burnt, does it turn on for a second then go off, or does it just go into protect mode soon as it receives power?

[@brycediven3595]

DCVR614 I have a Taramps amp that is going into protect mode after it starts to bump the woofer.

[@MariaMedina-qv6mk]

dude can you make a video how to set LPF on amp using a multimeter with hertz setting on it

[@luisguajardo1197]

I miss AMPLIFIED! Go visit Doug!

[@mike.hunt420]

@MiGueL Gonzalez that why you aint got no content?

[@dr.astro.hutchins]

Straightforward info! Thanks

[@cmn65401]

your distortion light came on on that last test on at 7:34

[@AmritSidhuSaab]

cmn65401 I was wondering the same since he said stereo isnt distorting and the AMP can put out 2000W, but the distortion light came on at 600W only.

[@citrusmcflygmailco]

Amrit Sidhu the reason for that is 2000 is the peak wattage only what it might hit at its maximum RMS is half of that usually at a thousand Watts and only if it's bridged. If it's a dual-channel that thousand is actually split between two creating a 500 RMS per Channel. As a rule of thumb if you have a 2 Channel 2000 watt amp it's 1000 / Channel Peak 500 RMS. The fact that it didn't distort till 600 is a matter of quality

[@TunedThunder97]

Just cause the stereo doesn't distort, doesn't mean the amp won't, I know this because I have the smd distortion detector

[@keithmcclain5375]

Amrit Sidhu hi

[@Asdasty]

The test is for 1% thd. So the dyno will automatically stopped once it reaches that point.

[@GodIsGood1991]

So you don't need to turn the lpf all the way up before using multimeter?

[@scottyhester1]

Could you use this formula to find a 1 ohm load?

[@magnuswf]

Yes, it's the same. Just measure the ACTUAL impedance of your subs, and remember to use an amp which is rated for the right impedance, otherwise you could damage the amp. Closer to 0 Ohms=closer to a short circuit.

[@johnb6520]

@@magnuswf I know this was a year ago but by actual do you mean if my sub is a dvc 2ohm and I wire it down to 1ohm I should use 2 in the formula instead of 1?

[@magnuswf]

@@johnb6520 if you have a sub with one voicecoil rated at 2ohm, you need an Amp which can handle 2ohm. How many voicecoils and ohms does yours have?

[@magnuswf]

@@johnb6520 and by actual i mean you need to measure with a multimeter on the ohm setting, instead of trusting the specs 100%

[@johnb6520]

@@magnuswf ive got a kicker cvx 12 dvc 2ohm rated for 750w rms and a kicker cxa800.1 newest model, 800w rms (certified power sheet in box says 857) stable down to 1ohm. Ive already wired the sub to 1ohm in the box, Havent started actual install yet. done a few in the past but never knew how to set up the amp and this is my first factory radio install so I want to do as much research as possible. I appreciate the reply man

[@alejandrovette]

FUCK YEAH! Thanks for the video! i was stuck with an 1800 watt rms amp with 1000 Watt rms woofers! I didn't know what to do until i saw this video. Thanks again!

[@Geerladenlad]

Great video! Very educational! I have a question for you: How long does it take for a stiffening cap to lose it's charge when left to sit disconnected?

[@phasechange5053]

+Geerladenlad I agree this is a really good video , explains alot of stuff.

[@de-emperor9053]

hi ,please I have a little issue with which amp to use for 2 12" kfc 3011 subs , I want to get a kenwood kac-9105d or kenwood kac-9104d , wanna know if it will work with the two subs ?

[@usmc2141ilya]

I would check for the Voltage at the battery when the car is at idle with headlights on, depending on the car's battery size and alternator output your voltage may vary.

[@silly_bandit_2093]

Thanks this helped so much. I do have 1 question that wasn't abwsered in the video. Does this method work if i have 2 subs plugged to 1 amp? If not how would I go about with the equations.

[@abduraghmaanlewis8619]

what if i connect a 4ohm woofer on 2ohms.. do i times the rms by 4 or 2

[@billyjarvis27]

U would donit at 2 ohms, its whatever the amp is gonna see, the amp is gonna think it's a 2 ohm load.

[@Tony-tk4ht]

I have a 1ohms amp but a 3.36ohms sub, so i would do 1 ohms when doing the formula for the sub?

[@Chromedome-ss6mg]

Your amplifier is not one ohm. It can handle one ohm. Your amplifier sees 3.36.

[@blackwebb30]

I have a 700w amp pushing 4 speakers 90w each (180 pair).Im using a multimeter to set my gains. The question is do i set my gains to the amp rms or the speakers rms, for example my amp Voltage wold be 52.91 and my speaker Voltage is 18.97. Hope I'm saying it right

[@ali-sleimanchehade6129]

And what if I am at 1 ohm? How should I set the gain?

[@FSXgta]

use your ears

[@colinshirshac4960]

Multiply by 1 stupid

[@Tony-tk4ht]

You ears are not accurate

[@XX-121]

need to read up on "ohm's law"

[@mannysalazar1124]

Hey great video! Question, I’m using the following setup on my Harley Davidson. Had a friend install and tune system but unfortunately I believe the tweeters where set incorrectly as they are now blown. x2 skar 6.5” (8 ohm) RMS: 260 watts x2 DB drive tweeter (4 ohm) RMS: 125 watts Diamond Audio Micro 4v2 600 watt 4 channel amp what should I set the 8 ohm mids to if the amp gives me the following specs. 150 watts x4 (2 ohm) 80 watts x4 (4 ohm) Also when playing the decibel sound track am I suppose to use the same decibel for lows for mids and high... I’m no expert in sound systems but am pretty mechanically and electrically inclined. Sound systems are a new area for me, any info will help. Thank you

[@paulvaladao6024]

when adjusting the gain on the amp what should my frequency be at when doing so.All the way up? or all the way down? or doesn't matter.

[@OBARRVAGOS]

Paul Valadao doesn't matter just set ur frequency and then set gain .

[@RemainNameless614]

Wrong. You set the gains then you adjust your filters.

[@OBARRVAGOS]

yup

[@ColdSteppinKeys]

So set the gain until it sounds how you want?

[@talclipse]

No you need to have a Constant Frequency in order to get a constant voltage!if you just play a random song the voltage will be all over the place and you won't be able to set it up correctly. Around 50hz should be a good starting point,but different frequencies will require different voltage,some more volts,some less.

[@gtstanton9785]

I understand the whole process and how to set your gain using your voltage number. My question is will that number change when you mess with the crossover I know you’re not supposed to use it but bass boost and subsonic filter?

[@RJ-ue3ub]

What if i have a sub that is rated at 550w rms and a amp that is also rated at 550w rms is that good?

[@diacom496]

Yes it's good, you can still use this formula to verify output on the amp, but it'd be more for verification rather than trying to actually adjust output.

[@greg0716]

That's ideally what you want

[@mavericktechreview1250]

Hi bro. Nice work. When you say the subwoofer RMS is that a total combination of speakers Watt? I have 4 speakers, 2 speakers rated 2 ohm, 2 speakers rated at 4ohm. Basically mixing 2 ohm and 4 ohm as it's front and rear pair of car speakers. How do I calculate the voltage?

[@joeastudillo9551]

I know this video is old when you say 300 watts is this means for both speaker or just one speaker? If it is two speaker of 300 watts 2 ohms like you said it will be 600 square root so if its two speaker it means double to get the square root

[@rickharrison6969]

If I have a bass knob, should I have that turned to the maximum setting while doing this? lol

[@josephpardo1427]

Keep it in the middle

[@lemsocruz]

Will this method works with all speakers and amplifiers ?

[@ganeshramoutar37]

Can u use this method for midrange speakers too?

[@_nosss_]

Hey man I love the vids and you guys have helped me become a DIYer since I've been unemployed and finding ways to blow my money lol but on a serious note. I have the set of Kicker CompR 12" subs from Best Buy paired with their 1200.1 amp. My question is, during this video, you mention the person having "300 watts" so is that two subs combined or you're calculating per sub? I'm sorry if that sounds confusing but for my setup, I know it's advertised at 2000 watts max, but rms-wise it's 1000 with 500 per each sub. I don't know if I plug in '500' or '1000' into the equation. again, sorry if it's confusing. addy just kicked in...

[@t.kickstartbun1e797]

If the subs are running together so wired on the same channel of the amp 1000

[@slowvr30]

Hi I have 2 subwoofers and 1 subwoofer is 400 watts RMS. So if I use this method will I add the RMS together or use the RMS of one subwoofer in the equation? Thanks!

[@lowhertzhighspl]

That meter has approximately doubled in price in 5 years. I just bought it for $6. Inflation sucks when wages don't inflate as quite as fast.

[@4yearsclean]

Trump 2020

[@ashrafmohamed4463]

Please try to use distortion detector to set the highest possible clean signal from an amp rated 300 or whatever, then measure the volt. and prove that ohms law is really good method to calculate.I really do not understand how you use the voltmeter and calculating based in Ohm's law. I think the resistor or the impedance will never stay at 4 ohms when there is frequency changing, I guess for the subwoofer frequency the resistance value may triple. and that makes our calculation very wrong, not even close to the value it suppose to be, it will be much less. Please feel free to comment and correct me if I am wrong

[@scarawko1664]

I have a 4 channel 1250w amp 14.4v (4ohms 4x125w, 2ohms 4x250w, 4ohms bridged 2x500w) and my car has 6 speakers (5 inch dash 45w 135max, door and rear 6x9s 100w 300max). What would you recommended to get the most and best out of them? Is it possible to connect all 6 to the amp without limiting their output power or should I just connect the 6x9s?

[@orlandorivera3199]

Hoping to get answer seeing this video is a little old.my amplifier manual says it will output 100 watts @ 4ohms ×4 @ "14.4" volts". I guess this is a dumb question but so does that mean I have to set the gain @ 14.4 volts too output 100 watts? Wish I could ask question differently but don't know how to explain what I'm thinking.

[@mikez4719]

What if i were doing this for a dual sub enclosure? How many ohms should i multiply by if i have two 4ohm subs rated at 1200w rms collectively

[@kellajones9942]

How would you do this equation for two speakers

[@atraxr603]

This was great. Very useful. Thanks!

[@jus1taj]

That’s very helpful. Thank you.

[@Live_Loud]

The distortion light stays on for 600w rms test! I think that amp is rated for more but still why we can see distortion over there?

[@jairomorfa]

Thank you so much, now I can understand very well

[@thisdude5850]

How then do you set the gain to achieve the rated rms of the amp? There tutorials and instructions all saying do not set the gain high but if I set it low, I won't achieve the rated wattage.

[@lowhertzhighspl]

Do we use the Ohms (R/Resistance) of what the sub is (D2) or what it's wired down to at the amp (1-ohm)?

[@cenexes12]

At the amp is your measured resistance affecting final output.

[@jakeydiesel09]

Just helped set my taramps smart 3 to 34.64 to run my 600rms 12”, while I wait a few days for my 1500rms 12”. But please answer this- I got a dual 2 ohm, so I will be wired @ 1ohm. According to the formula, 1500 square root is 38.72. A dual 4ohm coil wired to 2 ohm allows more voltage? Another 16v to be exact? My amp will supply 3k at either 1 or 2 ohm.

[@richardrhoads9088]

So I have 2 dual 2 ohm kicker L7 subs that are rated at 750rms each. And I got the kicker 1800.1 which says 1800 watts rms at 2ohms. The subs are wired so it's a 2ohm load at the amp. So my question is do I feed 1500 watts to the the subs so they each get 750 watts or do I only feed 750 watts?

[@numinous4789]

How did you verify that the head unit can be maxed with no clipping with your oscilloscope? Did you just connect one probe to the + RCA and the other to the - RCA? Or did have the RCAs plugged into an amp and use probes on the amp's outputs with the gain all the way down and the frequency all the way up? I'm trying to think which way is better...

[@andyyo2506]

Is the process the same when trying to set an amp for a component system... if so... would you use the rms wattage of the components and times the number by 2 because of the set? or just the 1 rms number... for example 90 watts rms at 4ohms or 90 watts ×2=180 at 4ohms= to get your targeted voltage thanks in advance

[@leenino4170]

So how would I use this method with an LC2i hooked up? What about LPF and HPF on amp? What should those be set at?

[@MrUffizzi]

great vid, question I have is how do I go about safely setting gains on my mids which are rated at 150 watts RMS but my amp is only 125 watts RMS ?

[@kennethweller2144]

so can I still turn my bass boost up after I set the gain like 2 notches up or should I just leave it alone? also I turned my deck bass settings down can I turn them up as well? I have a Alpine cde hd149bt