$150 SPL Challenge? Maximum Boom for Minimum Cost [4K]

[@midniteoyl8913]

Every time you show off some underrated cheap gear the price goes up the very next day..

[@wal]

Dang it!!

[@tyronepatterson5092]

Lol yup that is true

[@rodneygreenwaymusic]

@@wal it's true. Jus checked out the ignite amp. Went up $15 on amazon.

[@murrayent1able]

Yeap, I go on Amazon and check and like you said the price is higher than what he said.

[@djbradz7453]

It is known

[@wadehensley5005]

140db from 132 bucks worth of equipment and 360 watts is damn impressive, from any standpoint.

[@wal]

Yeah boi!

[@dudndadn12212]

Goes to show ya that the box is what makes it.

[@Crushonius]

@@dudndadn12212 not really the box is not even made for the woofers . in this case its not the box that makes it but that he got 4 12s for such a low price . 4 12s have about the same piston area as 2 18s that a lot of moving air even though they do not have some massive spl like excursion .

[@tinytrax1978]

Don’t forg

[@tinytrax1978]

Don’t forget the $3,000 battery bank power supply

[@jasonneal]

So as you know, going to a lower ohm load, your THD raises. So I would try a higher frequency. Also, if your just going for SPL, open your LP filter all the way or run the amp in full range. Also, put a oscilloscope on your head unit on the frequency your running to see where it clips at so you know not to run the volume past that. Distortion will give you a lower SPL reading.

[@shanenon85hawkins35]

Love how you just do things for fun that’s the hole point having fun and loving what you do keep it up

[@LerRhann]

Whole.

[@wal]

yeah boi!

[@LadrilloCuantico]

That's it !

[@reynellsantee147]

If you think this is just for fun, take a look at how many views he has, It's All About the Benjamins lol!! This man is getting rich off of you, just from you watching .

[@lastatmyownpace3497]

Yep

[@CompressedSoup]

less db more power consumption because of clipping probably

[@philmissy1]

more power consumption due to clipping? clipping by definition means your out of power. So no soup boi not at all. Once a systems max output is reached just to gain an extra 3dB requires twice the power. Still hasnt explained the lose but heat and inefficiency would. An efficiant amp turns 100% of the power in to power output. Impossible. Cheap amps ran at around 80-90% efficiency. The higher wattage just translates into heat clipping and disstorion in the output signal. The magical at 1%distortion rating is used for a reason. Every amp is capable of exceeding power output above it but the output degrades rapidly.

[@jimeppright7862]

Peaks are clipped but the average power increases. Sounds rough, but some like it.

[@dontrustwhiteyevery1]

Bet the protect light came on.

[@kevinlechner7722]

Maybe he peaked for like a fraction of a second but not enough time for enough pressure to build up inside?

[@robertkurtz7587]

Kevin Lechner had to be a burp then went into protect

[@HifiVega]

140db! Mission accomplished

[@wal]

Yeah boi!

[@bigboycombo6342]

Lol, not bad. I use to hit 126 when competing in 0 to 100 watt pro a long time ago.

[@thenotoriousrvh6091]

Dang lmao you had enough left over to include the Blaupunkt head unit 😂

[@depthsounderdave]

Mine gets here Thursday!

[@wal]

Ha, head units don’t account in $150 price

[@Corrosion37]

I have enough for one in my couch cushions

[@timmturner]

@@depthsounderdave I got mine a few days ago, haven't installed it though.

[@alec-s]

They sounds great...

[@richardgingras1293]

170$ including shipping on amazon for the amp now. Polk should slip you some thank you money for spiking their sales.

[@wal]

Wow, madness! Polk, just send me my check now 👈😬

[@Akira_203]

Less db probably a result of mismatched refresh intervals in the equipment. If the AMM1 is refreshing every 100ms but the dbMeter is refreshing ever 500ms you get weird results.

[@crazylarryjr]

That's what i was thinking to, latency actually or mismatched latency might be the cause

[@LerRhann]

This is the correct answer.

[@johnhornbeak5735]

Is there a standard refresh rate of most class D ? Or is it a factor of the quality of the power supply (Example: JL vs cheap SSL amps??

[@D4rk51d332]

@@johnhornbeak5735 They're talking about the how often the test equipment measures, not anything to do with the amplifier. Basically the refresh on the sound meter was slower than the refresh on the power meter. That is why it only showed 137db on 900 watts, if Big D would have let it play a second longer the meter would have probably read higher DB.

[@1Techoner1]

Why would it be designed that way. I'm slightly confused.

[@wal]

$150 SPL Challenge Rules / Results: 12voltmag.com/2019-150-spl-challenge/ Everyday Audios: kzbin.info HiFiVega: kzbin.info ShowTimeSPL: kzbin.info Gear used for my setup: 12" Blaupunkt Subwoofers: is.gd/blau12subwoofer Polk PA D2000.2 Amplifier: amzn.to/2Pps3Ze

[@ilovetoyotatrucks]

Williston Audio Labs im so doing this i will spend $100 or less on 2 subs & i bought a used Pioneer 800watts RMS 1ohm stable Pioneer MONO block & i got a OLD bandpass box 4th order bandpass is custom made so ill measure it for tunning and replace the missing plexiglass with 3/16ths i hope! Might need 1/4 im unsure

[@ghostunspeakable7866]

Anybody try those 10 inch titan subs they got at parts express for like $10.50 ? Old school flea market glitter subs.

[@ilovetoyotatrucks]

Ghost Unspeakable id say the pyle / BOSS/ lanzar/ ssl/blaupunk/ DUAL/ planet audio/insert direct from china sub are all built a tad bit better than those old paper cones id say those titans are simply midrange subs with a subwoofer surround imo!

[@toveryonder1115]

2 ohm?

[@ghostunspeakable7866]

@@toveryonder1115 they are 4 ohm. With a plastic cone. I think about 87db 200w.... But for $150 you could get a dozen of them.

[@test123apt]

Remember when Alma Gates had the world record bronco at 144db??? My how times have changed!

[@MyMediaConsulting]

I thought she hit 164 with the first PPI truck.

[@djshedd77]

@Shane DriftKing M3 Turner yeah... 144 is not that loud. I consider something to be "loud" when it reaches the 150 mark. 150db is a respectable number and 160+ is when you know someone's system is serious

[@audiophilecole2994]

@@djshedd77 144 is very loud compared to 99% of the nutsacks out there that think they are loud. Though they have systems that do Mid/High 130's with the factory door speakers playing with 10% distortion. Side note I do agree that LOUD starts with a "hair trick". Real close to 150db

[@dudeparistx]

I had a shop in Paris, Tx for 13 years. I sure do miss this industry. love your vids.

[@reganmorben9248]

Been at this since 88, 2 Things you can do to improve SPL with that box and in that type of vehicle. 1). Port it properly. You will EASILY pick up 3db just by porting/tuning that box properly. Those are port caps, they are meant to have an ABS or cardboard tube slipped over them which is trimmed to the correct length to make a port, they by themselves are not really supposed to be ports. I'm going to guess by looking... that the ports you'll eventually need will be close to 5 - 5.5 inches long. 2). Stand the box up, move it as far toward the front of the vehicle as you can, and point it to the rear with the ports at the top. The angle of the rear window will reflect the sound down into the hatch area where (as you know every time a low frequency sound wave bounces it matures) you will benefit more fully from "cabin gain" than if you put the port on the bottom and significantly more than if you faced the box forward. I expect you could be seeing 144 - 146db pretty easily. I'll lend you an HCCA 2100 for $50 lol!

[@Ebacherville]

I modeled these Blaupunkt's and guessed at his box dimensions and port size based on the data in the video his port air speed at full watts with these drivers are crazy high (off the chart high).. these subs are not reccommanded ported.. the only way to port them and get acceptable results are much much larger ports to prevent breakdown of the tune with the port airspeed..

[@staywhite6332]

@@Ebacherville You have something set wrong.

[@staywhite6332]

He's already peaking in a nice, high freq to get decent numbers out of those. Shorter port designs tend to peak way better for spl, so, his ports are pretty good, really. Personally, I would have done 1 common chamber, one larger port about that same length. But, this looks like an obvious old school box from the 90s when we often did double ports per chamber.

[@ryry7886]

@Chuck Holmes sub positionig makes a huge difference

[@ryry7886]

@Chuck Holmes "bass is non-directional"...? lol

[@TheBrokenLife]

Wired at 1ohm, set the volume on high, pause the track, power the amp up, and then just burp it. If you actually get that 950w for 1/2 second of full output, you should be good. Back in the day guys used to run their A/C on high forever to get the amps cold too. I think that was mostly superstition, but a bag of ice would be fun to try. All you need is that 1/2 second...

[@wal]

I tried this and it didn't work. I think the amp goes into protect before the meter measures. I'm going to get a TermLab to try as I've been putting off getting one for a long time now....and it's time to step up my game

[@robertpinger2537]

The problem with that is when you wire below stable load, the protection circuitry goes into effect when the rail capacity exceeds a certain limit. This is why “burp guys” typically do a “slow roll up” so that the ohm load can safely increase to a limit the amplifier will allow

[@JustSub2Me]

Yeah and you're right people sitting there running your AC that's not going to do nothing but draw current and pull power away from your system because unless he's got the amp mounted on the dash lol those AC vents are not going to do nothing later bro

[@pissedoffconservative347]

@@robertpinger2537 very intellagent comment. 100% correct . When we burp at .25 ohm Some times our rolls take 20 seconds to give impedance time to rise.

[@JustSub2Me]

@Buick Regal I agree with you but if you're competing your amps only going to be running for a minute or two tops. Because most people who burp don't demo

[@legendsofcaraudiobradnewso8424]

LMAO!!! Amp is rated at 4 ohm bridged, I am going to run it at 1 ohm! EPIC! :)

[@wal]

Ha ha, these new fangeled amps should be able to handle it, right? :-)

[@legendsofcaraudiobradnewso8424]

Williston Audio Labs exactly! Lol

[@Makeeverydaycount24]

And changed the fuses 😂😂😂🤦‍♂️🤦‍♂️

[@blackz06]

IF you understood "box rise", you wouldn't find it so funny.

[@dylansmed4305]

@@blackz06 please explain it. And why it's not funny

[@jasonneal]

So as you know, going to a lower ohm load, your THD raises. So I would try a higher frequency. Also, if your just going for SPL, open your LP filter all the way. Also, put a oscilloscope on your head unit on the frequency your running to see where it clips at so you know not to run the volume past that. Distortion will give you a lower SPL reading.

[@bradleypass2916]

Big D does a awesome job and is very informative about all of his test and information

[@GodfreyMasters]

This is honestly what I like to watch. Great video bro.

[@tankdog03ify]

I liked this video because your learning and teaching.. I enjoy this type of stuff

[@redan420]

Man I love this channel. Crazy how much money I wasted in the early 90's buying junk before saving up to buy a Fosgate Power 300 and Punch subs. It was worth its weight in gold but also cost about it's weight in gold back in the day. Keep up the good work!

[@jameselam8263]

Your measuring spl so the smaller the cabin the higher the pressure. Try raising the box up on a platform or making a temporary wall with some paneling. This will reduce the air space of the cabin.

[@wal]

Great tips, thanks!

[@floydbeard5073]

140 Is what your goal was Big D. Excellent job buddy not bad for a cheap budget build 🤙 thanks for the video and your time.

[@wal]

This was a FUN video for me to make and gave me ideas of future challenges where I can include you guys. This way we can all participate!

[@floydbeard5073]

@@wal sounds like a plan in the making.

[@FinsleysCustomCarAudio]

Never thought about checking sub phase like that. Thank you for teaching me that.

[@joeblank3235]

Clipping, once you go to high your speakers don't understand a square sine wave... It does more to hold at a point than move the speaker to a nice curve

[@wal]

But they are round? Not square. Ha, that was a joke! Thanks for commenting!

[@MrShiffles]

Nice test! I was predicting around the 140db range and you nailed it :) I bet if you played with the port sizes some you might find a better tuning to squeeze out another db or 2...or build a beastly 4th/6th order for even more...Cheers!

[@propabilityfpv303]

I saw a friend put the drill with the screwdriver bit right through his brand new 12" fosgate lol

[@aaronschen9896]

Just discovered your channel big D. Good stuff, takes me back.

[@wal]

Awesome! Glad to have you hear brother!

[@mackdurff8107]

The dampening factor of most amps is dramatically lowered when the ohm load is dropped. The loss of control of the subwoofers with increased distortion and loss of ability of the amp to deal with what the subs were reading back to it would limit its control to hold a pure tone.

[@johnraymaker5885]

I'm pretty sure he knows what he's doing dude

[@lmadden6236]

One of your best videos! I imagine you would gain with them facing the hatch, maybe 10" away.

[@wal]

Thanks for da tip!

[@buelliganx1]

That's what it's all about, having fun. Reminds me of back in the day scrounging together whatever we could get cheap just to see what it would do.

[@modelnutty6503]

WAY BACK, 1983, built cabs for a pair of 12's from an old console stereo and the 2x8" horns that went with them. old school under dash equalizer+amp feeding about 16w/ch, loudest little Mazda GLC ya ever seen, lmao!

[@buelliganx1]

@@modelnutty6503 I remember using two pyramid 10's and a scrap little sparkomatic power booster to make a pretty nice system. Used to piss people off when they would search my car for a hidden amp and all they could find was that crazy little booster. Lol

[@toveryonder1115]

Ssl makes a $30 12 with a fs of 30hz, 90db 1w@1m, 400 watts rms.

[@mrupholsteryman]

Have a link for this? I couldn't find that same price....

[@MidnightToker24]

They're $70 Canadian for the 12", $32 Canadian for the 8". Cheapest on Amazon.

[@toveryonder1115]

@@MidnightToker24 amazon is not the site you are looking for

[@RWL2012]

@@toveryonder1115 what IS...?

[@MidnightToker24]

@@toveryonder1115 for Canada that is the cheapest out of any site that I found with shipping factored in.

[@Newschoolcovers]

9:04 The power compression of the drivers probably takes effect. The amp is clipping, which causes the avg signal to increase from sine (crest 1.414) to square (crest 1). Accordingly, the coils of the drivers become very warm, the impedance increases and the efficiency decreases further. This also happens on the amp side, where the power supply outputs less on the output side as the switching power supply collapses. This then draws more current, but loses efficiency.

[@SparkedEd]

BLAUUUU. Thanks for the shout out my dude

[@wal]

👌😬👍

[@CVM222VOLT]

If you were my neighbor, I would show up with Pizza, soda, beer ... everytime I heard you experimenting with gear. I got into car audio as a teenager in the late 70s. I remember Blaupunk as that German brand that came as OEM in Porsche and a few other high end German cars. Never would have thought that name would be associated with dirt cheap gear in the future

[@vincentmeredith2561]

More than likely the subs were over worked at the higher watt causing distortion at the subs so they didnt work as efficiently?

[@evanfield580]

I think it would be louder with one speaker that is a little better in a smaller SPL box and a 1ohm load

[@Th3EcHo]

What app are you using to measure the Hz on your phone. If ya dont mind me asking

[@KnowName33]

My God I keep seeing people ask this. Do you really think it's an app from the App Store? No it's an app from the App Store that connects to the $400 sensor that's inside the car it's not a freaking Standalone app

[@patrickbranchini378]

@@KnowName33 big mad. Chill out.

[@KnowName33]

@@patrickbranchini378 sorry I just get frustrated when I keep seeing questions asked over and over again about things retarded so much so that a 3 year old wouldn't even ask

[@wal]

It's the SSA APM-2 Wireless SPL meter - is.gd/ssaapm2

[@matt.c.thehillbilly]

This answers my question lol I've been out of car audio for about 10 years and not current with some of the new gadgets thanks for the link I might have to invest in one of these

[@blkngwinn]

A bit off topic Big D but there`s an interesting and short article on the CE Outlook website regarding new amp ratings and they specifically addressed how consumers are getting ripped off with these inflated amp power ratings.

[@miguel300ish]

Hade to take a long crapper at work to see this video lmao lol

[@depthsounderdave]

Same

[@wal]

Way TMI..

[@bassnonmofficial5399]

Meters generally take a second to register a reading, likely just got that burst of power from rolling in fast. I’d go back and try to do a slow roll on so the amp hopefully doesn’t protect on you

[@johnjaromack9530]

Complete car audio noob here-thanks for the speaker phase tip. I feel like an idiot for not thinking of that myself. 🥴

[@ParkerTheBasshead]

Love it! Can't wait to see you hit that 150db

[@wal]

Throw that meter in the port and I’m there 😜

[@ParkerTheBasshead]

Williston Audio Labs 🤫 I won’t tell anyone 😂

[@Butrdtostngravy]

Maybe have Mark at Car Audio Fabrication see if he can built you a box for the specs of those subs xD

[@wal]

That's a great idea!

[@modelnutty6503]

it'd definitely help a bunch. even doing calculations for THAT box and reworking the ports could do good things.

[@keithblair2285]

Great vid Big D, the dB score was less because the amp went into protect before the cabin could pressurize enough and your meter responds a bit slow. The cabin of that Sequoia is massive and takes longer to build pressure up front compared to a small hatchback.

[@wal]

Thanks!

[@GRNDZRO13]

I gotta ask Big D, what app you using on your phone for the SPL?

[@kiltedvet420]

its not an app, he has a meter in the car, but it connects to the phone for a read out. the black box on passenger floor i think is where i saw it

[@cncgeneral]

Big old car should be peaking way lower than that, did you try a sweep to find where the peak was? I'd expect more like 40ish hz

[@jeremys8360]

Short 4 inch ports will do that. Those ports should be like 10 inches long each. They looked more like 6

[@Latinsonido]

Love to see you competing on the 150$ challenge bud, i´m corrently in 2nd place with a 149.1 dbs on 148$ system :)

[@wal]

Killing it 👌

[@keaton_mcrae]

Latinsonido what’s the setup you got?

[@Latinsonido]

@@keaton_mcrae powerbass 10" 275w sub and stetsom 1600w amp wired at 4 ohms, did over 145 on 95$ using a 400.2 powerbass amplifier too, my ports are made by baby milk cans btw lol

[@kaitlyntherasse8357]

I like the videos outside the lab. Curious to see what they hit rear facing!

[@wal]

Me too!

[@myz06rocks]

Even better would have been a comparison "taste test" style... Person picks their favourite. A $150 budget build and custom box vs. a $1000 big box retail store setup with subs amp and enclosure.

[@wal]

I see all kinds of possibilities for future challenges 🤙

[@zachjohnson1]

So you expect Wiz to pay $1k to a shop for a setup just for your viewing pleasure? What exactly would that accomplish?

[@myz06rocks]

@@zachjohnson1 did I say had to be his? Or that it couldn't be demo equipment? Or that it couldn't be that of an acquaintance? Relax...was just an idea. If I am deemed responsible for Big D's financial insolvency I promise I will assist.

[@7Logik]

Nice video and the box looks good , you've got a setup that I have been thinking of woth 4 10s . Faced up exactly like you have , I noticed your ports are facing up rather than to the side or back . Is there a reason you did it that way and what differences would there be vs placing it on the side vs straight up . Also what is your port velocity woth those multiple ports . Just curious

[@Guiltless765]

Very nice as usual Big D 🍺

[@wal]

Thanks for watching and commenting!

[@Guiltless765]

@@wal Always..Thank you for all you do for the car audio community.Us old dude's appreciate it.

[@Gambleraddictz]

This shows the Box is everything

[@wal]

This box wasn’t designed for these subs though. It was one I had sitting around. Surely could’ve got a better score with the optimal box

[@jeremih2969]

I wanted to hear a song...

[@runningbear1982]

That 9-volt tricks pretty slick there.

[@1rexrex]

Try it with one of the Rockford amps just to establish a real measurement.

[@wal]

Ha! I wanna try all kinds of amps, including the Orion 3k HCCA 👈😜

[@corbensmith9470]

Thanks for the video. Were you using just straight 60Db? Or what was the frequency cut off? I'm sure you paid a good penny for that meter. But if you could secure it so as the speakers are pumping you could also show in reference to how many watts are being thrown through it. Watching the video not able to feel the bass. This is just a idea maybe a bobblehead. In my Toyota the rearview mirror really starts bouncing. Something to give the audience the effect. Can't wait for the next video

[@sterlingtemple]

Thanks for driving the Polk audio amp price UP!!!!!! ha ha

[@wal]

Oh lawd! No deal is safe!!

[@jr1001jr]

hey Big D, just curious, what were the deciding factors for the equipment? were there certain specs on the subs OR the amp that made you choose them for your build?

[@ThisGuyDrives]

The subs were $20 each and the amp was $53. Money was the deciding factor.

[@wal]

What @Devil's Advocate said

[@Thumper68]

Distortion or subs maxed out at higher power so lower dB.

[@chuckantel6738]

I have 2 of those little gems of Polks. But I'm running them at 2ohm stable stereo... 2 4ohm per channel (mids and highs) I'd say the efficiency of the subs is better at lower power? Motor dictate that? Try a different frequency? I dunno...

[@trecedaves3159]

Bet at 2ohm that amp would have gone into protect. Rise you would be 4.3ish

[@wal]

I think it would do great at 2 ohms mono. I’ll need to add 4 more woofers though 👈😬

[@trecedaves3159]

@@wal that or change to 2 ohm subs. Perfect world right..

[@walk4God]

Great vid man. Reminds me of putting stuff together and experimenting when I was a teenager. If it blew..it blew lol As far as the output of wattage and spl rating, might have spiked last second before it cut off and your spl meter didnt have enough to sample to provide reading. How was the bass inside? Any different?

[@mickelfrisch9556]

OK that amp is more than $150 tho

[@ROTTBOXX]

This I totally want to see the outcome of. Unfortunately I'm at work. Would love to do an old school setup like my first beast setup. Mtx 2300 and 4 blue thunder legend 12s. Sealed. Never put it on the meter but it was loud.

[@jameswilliams4735]

Ah man...Blue Thunders and the old Terminators sounded so smooth back in da day! Wish I could go back in time to hear them again.

[@ROTTBOXX]

@@jameswilliams4735 no doubt. I keep trying to find some. Ebay.. craigslist.. good luck finding an old 2300. Theres 2300x's out there. I assume they are the same... but I'd like to see someone do a dyno. Hint hint!

[@jameswilliams4735]

@@ROTTBOXX Everytime I think about when I sold my 2 brand new Blue Thunders and my Rockford Audiophiles I just get sick...😢😢. And I sold my MTX 2300...😢😢🤯!

[@ROTTBOXX]

@@jameswilliams4735 same. If I could go back I would have just stashed them in a closet. And bought more of them lol

[@don_schwartzmeyer2379]

What’s sad is I don’t even have the money for that rn 😂

[@tatialo37]

weirdlife_8 _ 🤣🤣🤣

[@tatialo37]

Me either!!!!

[@Gamleprofil]

@@tatialo37 same lame

[@wishusknight3009]

The loss of sound pressure with more power is probably the amp losing a tonne of damping factor at such a low impedance. It may also be a bit of clipping too.

[@andylong2239]

Might check the glue under the rubber ring on the Blaupunkt 12's. My surrounds were not glued that well and had leaks where they mount to the basket. I bought some around the same time you did Big D before the price increase. Audible noise was present in sealed boxes until I added a little glue.

[@wal]

Thanks for the tip!!

[@MrBensmith8302]

Impedance matching is why you get less power at 1ohm. The amp is stereo and designed for 4ohm bridged. But its always fun to try pushing the limits!

[@wal]

Yeah, why not? For science 🧪

[@lowtoyxx]

This might be my favorite challenge ever. Good work d!!!!

[@wal]

Mine too. Have ideas for other challenges

[@wal]

Thanks bro!

[@lancegt01]

Man that is awesome numbers for that setup. Since your box is an “experienced” setup for some ol’school rockfords. Maybe try a different box fab. I bet these subs would put out some bigger SPL in a properly ported box enclosure? Just trying to help. Love your work!

[@josemontelongo404]

You could of discarded the amp In this budget test. Keep in mind you are using 60hz as your test tone. Simply run an extension cord to your vehicle and connect it directly to your speaker terminals. Again, just because you have high wattage it does not mean you will get high SPL. It has everything to do with the speakers linear Xmax, after the speaker reaches its xmax limit it will distort and change tone so the SPL from your tuned cavity suffers. Regardless its fun to see. Have fun and keep those videos coming.

[@charliewilson3369]

Thanks Big D for answering my question.

[@thetruthhurts4054]

Man you guys went next level . I had 4 punch pro 15s 1 linear power 1000 4 punch pro 10s on mid base on a linear power 500 and 4 linear power 1752s on mids and highs and got only 140s to 142 dbs. Back in the day. Ofcourse we were dodging dinosaurs back then. :-).

[@LerRhann]

Very very impressive big d. Love the vid.

[@blockbeata09]

Meter usually takes at least 3 seconds to register the score so I think it protected before the score popped up.

[@wal]

I think you right!

[@blockbeata09]

@@wal I used to compete in Meca fused classes so i had to figure out a way to run two Crescendo 5500s at .5ohm each on 240amps of in line fusing and make the fuses last long enough for the termlab register the score lol

[@kabco99]

I've been telling people about the battery trick for years to check polarity of some stock 6x9 or something that isn't marked. +to+ speaker will reflex up indicating correct polarity.

[@aaronspicer1093]

Did you fully close the rear door? Spunded like you put the door down, hatd to know if it was fully latched. You could have lost DB due to lost pressure out of the rear.

[@teepressifer]

Rolling the volume up slower will help a bit. The termlab takes a good 2-3 seconds to get an accurate reading. I think in your case the amp went into protect before the mic registered the spl. If it similar to a termlab for taking a good few seconds

[@normalicy]

I just got back from an unofficial soundoff in Odin Illinois that had a friend of mine that picked up 4 of these. He managed 149db in the kick panel with about 5000w available to the subs. I was shocked at how well they did.

[@wal]

We got 147.5 in my Ranger in kick with 2850W. Pretty crazy for $80 worth of subz

[@normalicy]

@@wal Kids have it so easy today. I had to spend a couple weeks of income to get a decent sub when I was in high school.

[@ruikazane5123]

Probably the less DB is because the amplifier is cutting the output and clips the signal in the process. (edit: tune the box to the higher frequency since impedance rise(aka box rise) is low on the tuning frequency! That will also produce a bump, up to 6 decibels or more!)

[@wal]

I will tune in! Like a banjo 😊

[@ruikazane5123]

Williston Audio Labs Be sure to wire it correctly for a 4 ohm load now as well. Impedance should be about spot on within 2 ohms from rated at the tuning frequency [Fb].

[@shimes424]

I like your phase check method! I personally use a D battery so I can use it on small speakers too (1.5v)

[@darrennaicker1913]

Just recently joined this channel damn,you make the best videos ever. Keep up the good work and all the best for the future.

[@wal]

Thanks brother! Great to have you here 👌

[@alfa7108]

Great vid thanks. Also makes me wonder if you would have put 3 or 4k on them for short period of time just for fun.

[@wal]

You know I'm gonna try, right?

[@jamesfair9751]

Port direction can greatly increase or decrease your db if that box can be manipulated around maybe try other positions and retest.

[@ChrisWilson999]

The lower SPL measurement was because the amp went to protect mode before the SPL meter had accumulated enough samples to display the next value. The SMD power meter would also have likely shown more power than it did. You can use an oscilloscope on a hall effect sensor to monitor power usage and will see higher peak values. On the SPL side, the meter works by taking an average value over a short period of time. If the amp goes to protect before it can calculate the next value, you won't see the peak measurement.

[@wal]

👍

[@rameshbhatnagar9606]

Hi from Mauritius Island. With regards to more power output but less db: To put it in a simpler way, imagine you have one 4 ohms woofer connected to a single channel amplifier ( imagine the amp is using one output transistor which has an internal resistance of 4 ohms as well)... so the output system matches and at full power both the transistor and woofer will bear the same output power. If you now bridge the same amplifier (each channel will have one transistor of 4ohms in series which makes 8 ohms)...when connected to the same 4ohm woofer, most of the power will dissipate through the internal transistor, as it is now twice the resistance of the woofer. Thats why, amplifiers have different impedence specification, so that the output matches and most of the power goes through the speakers.

[@adubs.]

My guess is the protect caused a quick enough power cut to get a spike from the inductors, but not long enough for the speakers to do anything. Total wild ass guess.

[@mattsnider5904]

That enclosure looks professionally made and looks like a nice clean install! Subwoofers = toys lol. It's fun booming and making your neighbors angry lol.

[@wal]

I don’t make my neighbors angry 😝

[@mattsnider5904]

@@wal Basshead harmony, right on

[@CactusJack252]

That box is doing a lot of the work. The whole set up is impressive for that money spent

[@wal]

These cheapo subs are boss mode

[@latenttweet]

Very very cool entertaining video much needed channel. However, there is no way that cell phone meter is accurate. Do you have another meter ?

[@wal]

The cell phone is only the display, the meter is an SSA APM-2 wireless SPL mater and tested within 0.4dB of the TermLab Magnum. See my comparison video here: kzbin.info/www/bejne/nnrZaWamnrqjjbc

[@DigitalNomad9209]

The reason you got less db at more power it because your coils had began to heat up. When the coils get warn, but not necessarily hot the subs tend to not get quite as loud

[@jamesmartin3533]

That nine volt battery trick is pretty cool!

[@wal]

Make sure those subs are in phase!

[@3dPrint_and_chill]

Every 1db needs twice the power because dbs is a logarithmic scale. Also the speakers may not be very efficient. Other thoughts, you may have a standing wave being produced in the car. It might be better to test them in a room with sound deadening to stop the figures being skewed by resonance effects. All that might be bollocks as my background is in radio communication not sound but sound waves and radio waves seem to act similar from my observations.

[@wal]

Thanks! The truck has zero sound deadening and I didn't even move the box around to try different locations. I think there's a couple of dB just waiting for me to find them

[@tonskulus]

Actually, doubling the power = +3dB in general (up to a point where something is starting to limit maximum SPL).

[@3dPrint_and_chill]

@@tonskulus thanks, like I said not really my field but I knew it was a logarithmic scale so you need to increase the power a lot for each perceptible change. A lot of people don't get that.

[@robertpinger2537]

Hey Derek @williston audio labs, here are a few things to try. Box position Seat position (lower rear seats) Open the glove box Sun visors Opening the driver door/ window Increasing/shrinking port area Add flares to both sides of the ports Decrease the number of ports and use 1 larger one Put the port on the side of the enclosure facing the hatch Put tape around the outside of the subs Cover the pole vent(s) with tape Shorten the speaker wires Shorten the power cables Add sound deadener Steering wheel position (height) Remove any trash/change/cups ect.

[@wal]

Awesome tips!! You da man 👌

[@bassheadofficial7341]

Open glove box?

[@graphenedream5939]

Probably went into protect before supplying full power, def. didn't like the low impedance. Not bad for the price. I have a feeling the box cost more than the rest of the equip..

[@kansasindependent4015]

I remember Blaupunkt from the old days it's good to see they're still around I always liked their products somewhere around my house I have a really old Blaupunkt amp what are the specs for the box used in this video if you don't mind me asking I like it : - )

[@wal]

It’s approx 8cu/ft with (4) 4” x 10” ports. Tuned approx 45Hz

[@AdamLower]

RMS power vs Peak power are 2 different things. Resonance in dirty power will put out less SPL than clean RMS at half the power

[@donjaun540]

Even though the subs are inexpensive do they sound good with music???

[@wal]

Sound really good for $20 each (when I bought them)

[@rueagonvyceratops2879]

the posibilities in a toyota sienna I have a 2002 sienna . looking to get a system in it , but first taking care of the vvt cam gear . since it has the cold start rattle , not everytime but it still has it now and then , and the van has 302,000 plus miles on it , and runs good still .

[@oldguyBMX]

I have a decent system in my truck. Would a app db meter work ok. I'd like to see ballpark figure.

[@momoneymattp7740]

no app one's dont even get close to ballpark and some u have to calibrate them and all one's that I have tried only max out at 120db there is none out there that will do over that so dont go by the icon that advertisers for that app... But if i was u and like am doing now am saving up to buy a Bluetooth SSA meter and i think they cost around 450-500$$ so if u want real true numbers buy the SSA db meter

[@wal]

Matthew above summed it up for sure. The SPL measurement part is the only one that kinda sucks for this challenge. You need either a $400+ meter or someone who has one. The miniSPL meter is around $220 I think and iti works fine as well. Get together with some friends and buy one and share it

[@oldguyBMX]

@@wal ok thanks for the info. I was out of the game for a few years. Maybe my system is not as loud as I think...lol. but it ripples the roof in my 03 Chevrolet Silverado kingcab...lol. it's a under the seat build. I was just curious to see what it is doing. But I'm not going to spend that kind of $$$ to find out...hahahaha..... thanks guy's I appreciate that info.