Hofmann's Iron Law: A Better Box for Better Bass!

Подписаться 90 тыс.

Просмотров 295 тыс.

50% 1

In this video I explain Hofmann's Iron Law, we learn a little bit about who Dr. Hofmann was, how to use his law to design a better box, get more bass, and how we can work around the law. To Learn more about box design check out these videos: • Port Tuning
Thank you to @Toid and @LivinLoudwithAndy for their help with this video!
If you found this video helpful then you can support the channel on Patreon for as little as $3 a month: / diyaudioguy
Affiliate* links to products used in the video:
JP8 Amplifier: lddy.no/11qim
Alternators: lddy.no/10avb
Try Amazon Music to listen to Hofmann Sr.'s piano concerts: amzn.to/3vEZyM0
Dayton Audio Subwoofer: parts-express.sjv.io/mgmjkD
Sundown Subwoofer: lddy.no/125np
Kicker Subwoofer: howl.me/cgZanpbU12f
Exclusive Discount Codes for DIY Audio Guy fans:
10% off at NVX.com (nvx.com/?ref=n_3Nr6MdZIar-d) with the code DIYAUDIO10
10% off of Custom Speaker Pods (customspeakerpods.com/) with the code DIYAG
Support DIY audio content by shopping with these affiliates:
Amazon: www.amazon.com/shop/diyaudioguy
Shop for Car Audio at NVX: nvx.com/?ref=n_3Nr6MdZIar-d
Shop for Basshead Gear at Down4Sound: lddy.no/1065t
Shop for Car and Home Audio at Crutchfield: howl.me/cg9bCOKLoK7
Shop for Car Audio at Sonic Electronix: bit.ly/3bazPBs
Shop for speakers at Parts Express: parts-express.sjv.io/0J6eYE
DIY Audio Merch: my-store-b3f136.creator-sprin...
Chapters:
0:00 Introduction
0:20 What is the Iron Law?
1:40 The Efficiency Formula.
3:00 A Practical Application of Hofmann's Iron Law.
4:00 Cabin Gain
4:20 Who was Hofmann?
6:40 Hofmann and TS parameters
8:30 Power and Efficiency.
9:30 Cheating the Iron Law
10:20 The Iron Law and Enclosure Design
*As an amazon associate marketer I may earn a small commission on qualified purchases. As an affiliate marketer I may earn a small commission when you make a purchase at Parts Express, Sonic Electronix or Down4Sound.

Авто/Мото

Опубликовано:

9 июн 2024

Ссылка:

Скачать:

Готовим ссылку...

Добавить в:

Мой плейлист

Посмотреть позже

Комментарии : 447

@DIYAudioGuy 2 года назад

Learn more about subwoofer design here: ru-vid.com/group/PL3Aot9dMXzXZ21MXAzvirExu0sfsWWSHT

@BabyCharlotteschannel 2 года назад

Well explained. I'm a technical reading and learning geek so this stuff is right up my alley! Thank you for another great video Brother!

@DIYAudioGuy 2 года назад

@@BabyCharlotteschannel I always prefer the more technical stuff.

@lawr3nc3mann84 2 года назад

Thanks.

@unbanmy360 Год назад

I use pa driver's as subs on class a b amps on a factory alt🤫

@DIYAudioGuy Год назад

@@unbanmy360 Those PA drivers are very efficient.

@DJ_Force 2 года назад

"Why is there so much math?" Because math is how you understand and predict the behavior of the physical world.

@DIYAudioGuy 2 года назад

That's a great way to put it!

@kevinwheeler5595 3 месяца назад

After all, math is the only pure science followed by chemistry and biology.

@user-dm5dx1ms6l Месяц назад

@@kevinwheeler5595 What about Physics

@ParaSiempreCinema 2 года назад

So over a year ago I bought a qbomb for two 10s. The box is huge and tuned to 35hz (I've checked specs and done my tests and yes it's tuned to 35hz). I uploaded a picture of my setup banging on a facebook bass group and holy shit, I was told I was dumb that my box was way too big and that my subs were clipping blah blah blah. I ran those two 10s in this box for over a year with zero issues and it banged! Now I'm using the same box but with more beefy subs and it still sounds incredible! Moral of the story, don't listen to haters on fb or youtube

@DIYAudioGuy 2 года назад

Absolutely! I bought this box with the intention of trashing it. I was wrong.

@kipplitz 2 года назад

On a side jag... One of the smartest guys out there, Ol' Albert Einstein, once said he didn't need to know everything, he just needed to know where to go look for it.

@DIYAudioGuy 2 года назад

Absolutely, save your brain power for the important stuff.

@Boogerweldz 2 года назад

This is one the very best in recent times and most interesting audio related RU-vid videos I’ve ever seen. The back story on Hofmann and others was excellent! the side stories from other RU-vidrs… so good!

@DIYAudioGuy 2 года назад

Thanks!

@TimpBizkit Год назад

Passive radiators can actually be more efficient than ports when using high power. Passive radiators don't compress as much if you're using a small enclosure that needs a long skinny port. You can also tweak the frequency response. You can save a bit of space if you build a box that can get low, but has most of the efficiency from 50-90 Hz. Another way you can save space is by using thinner box walls and regular thin bracing. Baltic birch allows you to build thinner than MDF. I have an enclosure that's over 3 cubic feet and the box walls are 3/8" thick, but it doesn't flex due to bracing. The total material use goes down, therefore space, although it is more tedious to build. L section metal braces are the least space consuming and thick chunks of MDF the most.

@samuelnewberry8259 Год назад

just recently I've been interested in building my own sub enclosure but don't just want prefab quality and performance. very much appreciate how you make your videos educational and fun to watch. thank you so much for your hard work!

@DIYAudioGuy Год назад

Thanks for watching.

@tomcat8983 2 года назад

Fantastic video! My Acoustic Research 12" powered sub I've had for around 20 years means so much more to me now after learning about Hofmann. Thanks!!

@DIYAudioGuy 2 года назад

As best I can tell KLH is the only one of the three that still making hi-fi speakers. So you might just have yourself a rare gem right there!

@KeithCopeland778 9 месяцев назад

Hofmann was obviously an intellectual GIANT!!!!!!!! Very impressive and informative video!!!

@justins.1283 2 года назад

I like to use efficient drivers so that I can keep the power requirements reasonable. You can actually make a system that sounds good without needing a ton of power if you choose your driver's properly.

@DIYAudioGuy 2 года назад

That's a smart strategy.

@erikbritz8095 2 года назад

Recently found this out when my cheaper but high sensitivity PA sub beat out my DD715 in SQ matching it in SPL well 80% of it and plays just as low but actually higher this lead me to believe that when starting out in car audio a high efficieny driver is a lot better.

@DIYAudioGuy 2 года назад

@@erikbritz8095 What is the PA sub?

@erikbritz8095 2 года назад

@@DIYAudioGuy pro Audio sub 96DB spl and a local brand called P. Audio basically cheaper Beyma woofers i can do hair tricks and play as low as 19hz in car with it on 600watts im gonna do some more testing soon and put more vids on my channel as only my DD715s vids are up at the moment.

@yzrippin 2 года назад

@@erikbritz8095 please do you say hair tricks and low lows only 600w? I just blew my jl 10w1v2. (Was very old and tattered. I got 600w to play with out my gmd9605. So which subs are in your car?

@the_nondrive_side 4 месяца назад

as a child in the 90s I got an installers manual.. the pioneer bass book.. like 1993 or so.. i figured out T&S real quick and was making 2.5-5cuft ported boxes right fast.. but also was making custom external ported behind the seat truck enclosures.. running the port under the seat externally along the floor. my first in a 93 b2200 where the OEM jack was mounted

@gamefreak249 2 года назад

I'm building a full sound system with my buddies, and we just picked up two Eminence NSW6021-6. This video will definitely help us!!

@HifiVega 2 года назад

This is an excellent video Justin well worth anyones time kudos.

@DIYAudioGuy 2 года назад

Thanks man! It was a ton of fun to make!

@VoltzIsSalty 2 года назад

That alternator upgrade is so worth it though i’m able to keep my 3000w taramps smart 3 at full blast (78v at 1.6ohm/about 3800w give or take) any time any frequency forever as long as the car is running with my 240amp alt and xspower battery along with 0 gauge runs for power and additional grounds. Box is also tuned to 29hz so it hits them lows. Also have a built in volt meter in my car and while cruising voltage is always 13.8-14.5 and at idle only drops to 12.7 on the power hungry frequencies. (Box was designed by me courtesy of your awesome videos!)

@DIYAudioGuy 2 года назад

For that kind of power you definitely need the alternator.

@Hammerback972 6 месяцев назад

I have a 325 HO alt running a Orion HCCA SPLX 3000.1D @ 1ohm, cruising I am able to maintain 14.8-15.2. Drawback is the alternator cost more than what my car is. Im serious😂

@kipplitz 2 года назад

Great video! Keep up the fantastic work, love watching your content.

@DIYAudioGuy 2 года назад

I'll need to bring you in for a guest spot sometime!

@matthewlowry1268 Год назад

Great info! I appreciate that you provide the why behind a method so we can apply it to our own ideas. Thank you!

@DIYAudioGuy Год назад

Glad it was helpful!

@edwardmonsariste4050 9 месяцев назад

I was going to comment about getting around Hofmann’s Law while the video was playing. You did a great job explaining how easy it is today to achieve extreme sound pressure at low frequencies without a huge box.

@gsxroyce256 Год назад

I’m soooo glad I found this channel. Soon as get caught up I’ll join for the min amount anyway to help support the channel. I need this information so it’s worth a tip to me.

@DIYAudioGuy Год назад

Thanks!

@turboduckhead6179 2 года назад

Love your passion and enthusiasm for science

@DIYAudioGuy 2 года назад

There are so many cool things in the world! Look up Hofmann's father. Amazing man.

@rollme1kenobi893 2 года назад

Keep up the good work.👍👍Very practical. And that's awesome! 5% of the world might be trying to put 12, 18's in a car our house. Your explaining how to be as efficient as possible. That's what the other 95% is trying to do. Thank you!

@DIYAudioGuy 2 года назад

That is what I'm shooting for!

@rz9708 2 года назад

Great video brotha. Keep dropping the knowledge on us we appreciate it.

@DIYAudioGuy 2 года назад

Thanks!

@tomvanrijswijk4517 2 года назад

Great video with good information. For me personally the math is fine and not even complicated at all. The video style is very nice as well. I liked the different shots between your talking!

@DIYAudioGuy 2 года назад

Most people pay to much attention to watts and overlook efficiency.

@bbsSKEET13 7 месяцев назад

Wow! This video is less than 12 mins but helped me a lot, thanks.

@carlosmauricioespitia6016 2 года назад

Great job on the editing!! Wow! Great content

@DIYAudioGuy 2 года назад

Thanks, glad you enjoyed it.

@ScottGrammer 2 года назад

Very well-done video. I have a lot of time explaining this to people. Now I can just point them to your video.

@DIYAudioGuy 2 года назад

Please share it with them!

@ScottGrammer 2 года назад

@@DIYAudioGuy I'll be discussing speakers in a future video, and I'll link to your video when I do.

@lupuradu Месяц назад

Watching videos like this one makes me realize i'm missing so many knowledge, that i don't even know what the heck do i seek for in terms of audio performance.

@bingdong8571 Год назад

Very good stuff, i used to work on car audio back in the 90s. Im glad i only build home stuff now.

@SS-sw8de 2 года назад

Great job bringing the good energy, and great information.🔥💯

@DIYAudioGuy 2 года назад

Glad you enjoyed it! I has a lot of fun digging into Dr. Hofmann's story. His dad was even more impressive. He was literally the worlds best concert pianist during his time.

@SS-sw8de 2 года назад

I will be looking into him also. Thank you!

@zarboaudioprojects1430 2 года назад

I enjoyed watching this video and learning more about something us DIY speaker guys often quote, but don't really know that much about, Hoffmann's Iron Law. I really like your channel -- the content, and how you do your videos. Informative and entertaining... plus you're brave enough to do the car audio thing... that takes GUTS!!!! -- Tom Zarbo (AKA Zarbo Audio Projects)

@DIYAudioGuy 2 года назад

Brave, or stupid? I will let you know when I found out!

@flaplaya 2 года назад

First off awesome video I love math equations they tend not to lie. As a kid I had a Cerwin Vega 15 free air dual VC that I installed in a huge homemade sealed enclosure just like buds. It hammered so low so hard. No mid all lows sub 200 hz. I've never been able to duplicate that performance because I got lucky and don't remember the exact dimensions.. My dad helped me and allowed me to jam that thing in my room as a kid and this video brought back those memories. Thanks guy. Oh I forgot to mention rigidity of enclosure. Less flexibility of box = way more output... Cool side note about jumbo btw. Awesome stuff!

@DIYAudioGuy 2 года назад

That's awesome!

@alhammons7112 2 года назад

This is a wonderful video. Good job!!

@DIYAudioGuy 2 года назад

Thank you!

@audfrknaveen2256 2 года назад

I know the law for many years. But I don't know the formula. Thanks for sharing Adudo guy !!!! 😀😀😀👍👍👍

@DIYAudioGuy 2 года назад

It was a fun video to make, I'm glad you enjoyed it.

@andyjr2683 2 года назад

Thank you sir. I watched it twice!!

@DIYAudioGuy 2 года назад

Awesome! Thanks for watching..

@SpeakerBuilder 2 года назад

From my vast experience in home audio, I would add that the different bass driver sizes effects the overall character of the bass, not just the power. I was surprised to learn when I auditioned three systems for a guest some years ago, with each system using a different bass driver size (8", 10" and 12") that the different bass driver sizes (each in a large vented enclosure) produced different bass performance characteristics. And I would add that the smaller bass driver worked better in a smaller room, and as the room size increased, the larger bass driver worked better: 8" in a 100 sq ft room, 10" for up to 200 sq ft, and 12" for rooms above 200 sq ft.

@DIYAudioGuy 2 года назад

Absolutely!

@TRC2002 Год назад

15, 18, 21, up to 33 being biggest home theater sub.

@eclampsium 3 месяца назад

Man that 15” flat down to 21hz would be sooooo coool and i bet so many people wouldn’t mind the size trade to have one of those in the Ht!

@nickstalhood5380 2 года назад

Love your channel keep up the good work

@DIYAudioGuy 2 года назад

Thanks!

@jccjmml7 2 года назад

It's funny how you can get down to the nitty gritty of drivers and enclosures for car applications and try to nail it down like a boss......THEN you go and stick it in a vehicle with its own unique acoustic properties and throw a wrench in the whole thing. Recently took my buddy and I five different box configurations/designs to get it right....all because of the dang vehicle.

@DIYAudioGuy 2 года назад

Absolutely! All of the formulas and software assume you are playing in an infinity large room.

@dnate697 5 месяцев назад

Gosh I love this video!

@High-Tech-Redneck Год назад

best system I ever built was four 10 Kicker comps, each in a 1 cubic foot box mounted in rear of my Dodge Dakota RT extended cab. Kenwood 1100 watt amp, really good bass, but slot ports are the next level, and I am so ready for my new system

@consciouscool Год назад

This is so interesting. Technically speaking the game has changed so much. I remember house parties with base bottoms and fans on the amp in the winter months with the windows open in the PJs and your were still sweating.

@DIYAudioGuy Год назад

Parties tend to get hot.

@consciouscool Год назад

We had an Econoline van that we used to transport the equipment a real POS. He installed (2) 18 in speakers in the rear cargo doors with a 500w Sherwood amp. That thing was booming even though we didn't know what we were doing. Thanks for the hard work you do for this channel.

@SaltwaterBoogeyman 2 года назад

Awesome video and great history! Knew about the law but not about the person nor history. Nicely done

@DIYAudioGuy 2 года назад

Thanks! I had a lot of fun putting this video together.

@jajuanrussell5386 Год назад

I had 2 12" SE subwoofers in a sealed 5 cubic² inch box. Wired at 2 ohms, and firing 1200 watts from the trunk into the cab of a 2001 Nissan Altima; that provided some clean low bass. Althoughbeit, the bass was made even better after a SoundStream crossover was installed. The complaint is that I had to sacrifice the entire trunk for a loud stereo system. 50×4 watts Pioneer head unit feeding 400 watt amplifier on high pass which powered 4 3-way Pioneer 6×9 and 2 Kenwood tweeters. I tried to run a 2000 watt SoundStream Amp, but I fried it. Alternator did not supply enough power to it. The 1200 watt Amp used to go into protect a lot in the summer time; but it did the job when it worked.

@1389Chopin 2 года назад

Appreciate the shout out to hoffman sr. Titan of the keyboard - one of the greatest of all time

@DIYAudioGuy 2 года назад

He was a legend!

@JAM-ur8tj 2 года назад

Great informative video!

@DIYAudioGuy 2 года назад

Hofmann was an interesting guy!

@fxandbabygirllvvs 2 года назад

Living loud with Andy love that dude he's a cool dude

@DIYAudioGuy 2 года назад

I think he has a great on-screen presence. He will have 20k subs here on YT by this time next year.

@High-Tech-Redneck Год назад

thanks for a good video, lots of information and I am patiently awaiting my new system, two 10's in slot port box..............curently have one 10 in a powered box

@bingdong8571 8 месяцев назад

Good history lesson. Thanks

@DIYAudioGuy 8 месяцев назад

Glad you enjoyed it

@TRONMAGNUM2099 2 года назад

Cool video, learned something new.

@DIYAudioGuy 2 года назад

Awesome, thanks.

@neonspeed1995 3 месяца назад

I remember when I was 14 I bought 2 KLH 15" floor speakers from best buy and I was so proud of them, they were the first brand new speakers I bought myself brand new lol.

@DIYAudioGuy 3 месяца назад

I still have my floor standing speakers from Radio Shack, purchased in 1988.

@janbenschop7597 Месяц назад

Henry Kloss was actually the driving force behind AR, KLH (KLossHenry), Advent, and Cambridge Audio.

@lexi-conby 2 года назад

great video! i always had a feeling that my jl audio 12w6v2-d4 sub sounded okay with the 1.25cu ft recommended sealed but not great. recently, i was trying to build a 2 cu ft port but since i still stuck at building ported boxes, it ended up being a 2.3 cu ft sealed box. in any case, it sounds sooooo much better loud and low. now i know why thx to your explanation and hofmann

@DIYAudioGuy 2 года назад

It takes space to make bass.

@johnbacani2323 Год назад

I bought a used JL 10W7 and bought a costum box that was made for 12W7 ported specs. The hole was cut to fit a 10s. I’m so excited to get tyem installed and tuned! It will be loud and low as what you have experienced here too

@djnaughtybass Год назад

For my solo DDX-12 the box it was in was small and high tuned so it was honestly just loud wouldn't hit low what so ever, so I decided to build a 2.5 cubic foot box tuned down to 35hz and now she slaps all the way down to 28hz with a bandwidth of 28-71hz and I don't think I'll ever go back lol

@justingillette8287 3 месяца назад

Good content sir!

@DIYAudioGuy 3 месяца назад

Glad you liked it

@kiiarahasnosynonyms 2 года назад

this is critical information!! thank you!!!

@DIYAudioGuy 2 года назад

As long as we don't achieve critical mass! The results would be explosive.

@kiiarahasnosynonyms 2 года назад

@@DIYAudioGuy ⚙️🙂

@johnviera3884 2 года назад

Your a beast man. What a fantastic video.

@DIYAudioGuy 2 года назад

Thanks

@davidkoslek9372 2 года назад

justin dropin" that tuesday knowledge!!

@DIYAudioGuy 2 года назад

Partying on a Tuesday!

@gordythecreator 2 года назад

Hofmann's life sounds like my upbringing. Frequency means more than EVERYONE ELSE can fathom.

@DIYAudioGuy 2 года назад

Yea, his dad was more interesting than he was. Apparently he was literately the best concert pianist on the planet during his day.

@pk3776 2 года назад

The knowledge…right there!…👍💯🖖🙏

@DIYAudioGuy 2 года назад

Hofmann was a bright fellow.

@andrewandrosow4797 8 месяцев назад

Good video! In my opinion - vented port sounds gives more deeper and natural bass.I have been making an experiment - 2.5`` speaker in small 0.3L box with 1`` plastic pipe - the length of a pipe was 20``. The speaker (unexpectedly for me ) played sounds below 100Hz - but there was resonances on harmonics in the port pipe and sound wasn`t clear in mid-range band.

@robertstembridgejr7532 4 месяца назад

My car used to hit 146db with two 12's sealed box! So don't be afraid to build a sealed box it'll sound better too over a ported box!

@Ghaleon42 2 года назад

What an amazing video

@DIYAudioGuy 2 года назад

Thanks!

@Ronco160 2 года назад

Good info 👍

@DIYAudioGuy 2 года назад

Thanks 👍

@JeffrayCrownwell 2 года назад

Well! I have learned a lot from some of the most esteemed audio engineers and received a lot of answers about speakers and amplifiers that I found one way to make speakers sound so incredibly natural and wish such rich and deep bass that you have to listen to it to believe it! I'm sure that you know about the Cerwin Vega speakers and their reputation for their nice and deep (Not saying that they are the best but they have a solid low frequency even though it's a bit too cracky....if you know what I mean!) I personally made some 6½ woofers sounds even lower in bass and so incredibly softer that everyone who heard them could not believe that the bass of a 6½ was way better than a 10 inches woofer from Cerwin Vega! I did use the same reference in order to build some much bigger speakers and the results were also absolutely amazing! I wish I could have my very own company!

@DIYAudioGuy 2 года назад

My home theater set up uses two 5 and 1/4-in drivers and a transmission line for the right and left speakers. I lost my subwoofer amplifier due to a lightning strike / power surge and I didn't even notice at the sub it stop playing until I had the house to myself and wanted to crank some base heavy tracks.

@Grim67firebird 2 года назад

Hello , I love the videos you have put together on boxes . Whats your stand on the so called 6th order boxes and do u feel they are worth the time to build? Thanks for all the time and knowledge you provide .

@DIYAudioGuy 2 года назад

Unless you are doing SPL competitions it is hard to beat a ported enclosure.

@Grim67firebird 2 года назад

@@DIYAudioGuy the 6th order is supposed to be a dual tune port so u can play a larger variety of notes with less restriction and role off but just seems kinda impossible to be true when listening to you explain ho the ported system works. Is it true they work as they say so i can tune one at 23hz and another at 40hz ?

@cartruck1070 2 года назад

Knowing this and your ts parimeters and learning how to use winisd properly will allow u to find that sweet spot and build a box better then the other guy. 😁👍👍

@DIYAudioGuy 2 года назад

That is the goal.

@lylegoodluck Год назад

Thank car audio gods for Hofmann!!

@DIYAudioGuy Год назад

He was a giant.

@georgem6359 7 месяцев назад

Hofmann was the Man! BTW, I do the same - always design enclosures bigger than the manufacturer's spec's and get better results.

@iikatinggangsengii2471 5 месяцев назад

true2 there are tons of them, who knows slightly more money on different brand may improve alot the portable isnt available though, not sure it is better than all ive heard and isnt comparable to desktops either, prob best to expect lower on purchases, it makes 10 points upgrade 'rule' remains true lol, shouldve patented it tbh

@Audysseus 2 года назад

youre going to blow up man im so hyped, you make such quality videos there is no way youll spin tires.

@DIYAudioGuy 2 года назад

I am just hyped to be here!

@Audysseus 2 года назад

@@DIYAudioGuy thats why youre succeeding, in it because you love it not because you want it.

@keithwiebe1787 8 месяцев назад

Years ago a CD magazine told how to build a subwoofer from a 12 inch Eminence sub at the time and it was used in an expensive M and K system. Well, I built that but the sub would bottom out with only 25 watts applied to it. A couple years later found out that the sub worked much better in a 1 cubic ft enclosure instead of the gentler Q design at 3.5 cubic feet. Before I could experiment the subwoofer's foam surround fell apart. I let some years pass and in the meantime built some khorns (mid 80s) and 10 years later bought a car sub off of ebay. It happened to be a MA audio MA121XQ and it had the right parameters for the 3.5 box I had made a decade or more earlier. Tuned to 27hz or so and powered by a 300 watt amp (I just replaced it yesterday with a new Dayton 250 amp with dsp) and it doesn't bottom out and just works. Low cost too. It has 10mm xmax which seems plenty.

@JohnDoe-fk5fr 5 месяцев назад

You really hit the nail on the head when you said the amp is the cheap part. I just got the jp63 after watching your videos and I spent $1700 on the amp. I had to buy $350 on wiring, all 0guage copper. Then the demand for amperage I have three optima batteries which are $400 each and the lto 6.0 it was another $500 once I had it shipped from Vegas. So ya over $2000 just for the equipment to run that amp. Total cost of amp was $3750. Then the sub was $1600(rs team 18) and birch box with 3” baffle and 2.25” walls was $960. Hope people understand this when they think the amp is inexpensive. I haven’t even upgraded my alternator yet either, luckily it’s a 200amp (f250superdutystock) and keeps up fine. So ya, my one sub system was $7000 and shipping that shit from Vegas to Vancouver island wasn’t cheap. $550 in total shipping for the jp63 and a jp100.4 so probably was over 7k.

@DIYAudioGuy 4 месяца назад

Amps are cheap, but power is not.

@donepearce 9 месяцев назад

I like my bass low, but for the enclosure that lives under my desk, I don't need it loud. So I tune for extended response and I have flat response down to about 15Hz. I don't hear that, I feel it. It does result in a port that chuffs, but I don't hear that because the desk is in the way. After that I use Sonarworks for final integration. The result is fine.

@fargobill Год назад

is there a calculator online to input the parameters and get the result? You left out the part of how to apply the law to get the most out of the enclosure, or did I miss something?

@anthonybrown6143 2 года назад

I have a question you may be able to help me with. I'm running after the head-unit is a AudioControl DM-810 Processor, AudioControl Epicenter, Three Alpine Amplifier's ( two are bass amps), aftermarket Bass Knob and a Ill Auto Sound RCA Distribution block. I wanted to know in what order should install everything? Example: epicenter before the DM-810 processor or vice verse? And how should I run my aftermarket bass knob? Thank you very much for your advice.

@DIYAudioGuy 2 года назад

It's hard to do troubleshooting and gear setup in the RU-vid comments. But I think you have too many components in your signal chain. I think the DM810 is all that you need, It has AccuBass and a wired remote.

@davidheiner4378 Месяц назад

So if I bought a 12” woofer that didn’t require a big box, but put it in a big box it would perform better and hit lower than a box that was fit for the subwoofer?

@technodaz Месяц назад

I got 3x12 up front and 2x12 under the couch , my walls are 3-4ft thick stone wall and between this room and the dining room is a 7ft tunnel of stone.....basically open the door stand outside and the loudest bass in the house, the tunnel is basically the port of my sitting room speaker.

@jeanious2009 Год назад

12:00 Mannnn I remember the PA Electrovoice ELM12’s some were using in their vehicles. I had two recently in 2006 in a jeep Cherokee and them EV’s GOT HELLA LOUD when it was around 100-400hz which is unheard of any 12” car subwoofer being able to do. I had a 12” subwoofer as well for the lows so I had nice coverage on the low end from 36hz-400hz.

@DIYAudioGuy Год назад

Yea, a lot of the early car subwoofers were EV's or Eminence PA drivers.

@jamesbannister7512 Год назад

So here is something I have been doing for a few years that seems to work well. 10 inch sub in a box with volume for a 12. 12 sub in a box with volume for a 15 and so on. Not sure how well my idea works on paper but it usually sound pretty good to me. My current set up is pretty low budget. 7.2 surround sound. With old school sony tower speakers for my bass. internally braced because of half inch fiber board. Boxes are 2.6 cubic ft with 12 inch woofers on a 200watt rms fisher 2 ch amp. Ports are two inch abs pipe about 12 inches long. Seems to do pretty well. Nothing crazy for a set up but over all it seems to work well.

@DIYAudioGuy Год назад

That is not a bad rule of thumb.

@kiiarahasnosynonyms 2 года назад

just a thought but an ole ambulance or fire rescue truck will have the "power " and space to build a really nice portable test station 🚑 they have massive electrical charging systems and well built and maintained yet cheap on the market

@DIYAudioGuy 2 года назад

I thought the exact same thing! If I were going to build a bass van That is the route I would take.

@treasurehunt7812 2 года назад

Used to run a professional audio company, designing building and installing sound systems in various live pa venues... I'm learning stuff here, LOL...

@DIYAudioGuy 2 года назад

You should start posting videos yourself! I bet I can learn a ton from you.

@gabrielrivera4929 2 года назад

Question: I’ve always bought prefab boxes but I finally saved enough to buy a ported custom box. I listen to various types of music but mostly rap. Hate to be a dummy but I have no clue what I should tune my box to. Thinking about 37hz-41hz.

@DIYAudioGuy 2 года назад

It really has more to do with your taste and the sub you are using. I would tune it a bit lower, but that is just my preference. I would rather be low than loud so I tend to shoot for the lower 30's. I did have a 10 tuned to 22HZ, I enjoyed those extreme lows, but I sacrificed to much output/SPL. That is the tradeoff with a ported enclosure, you can tune it low, or loud. You have to pick.

@kenso.1 2 года назад

agreed. in isolated frequency testing, i found 30-40Hz to provide the most bang for the buck. while i would love to feel the 25Hz magic, it is simply not realistic with my “budget” system and is way inefficient down there. used a deep crossover to tune as much of that signal out as possible.

@bakhtiyargillani 2 года назад

I need a little guidance over here. So basically, I have an old Pioneer 307-d2 sub and i'm willing to add it to my home theater. What cubic ft should the box needs to be exact in order to get proper low output in a room?

@DIYAudioGuy 2 года назад

diysubwoofer.blogspot.com/2021/05/custom-subwoofer-enclosure-designs.html

@08magnumsrt Год назад

I was wondering if you could please tell me what type of passive radio that is at the 3 minute mark of your video? It doesn't look like a SLAPS radiator. It's basically the only other one that I've seen built well like the one you pictured.

@DIYAudioGuy Год назад

parts-express.sjv.io/0JN2QV

@EDUARDO260692 21 день назад

96% of the video: I love Hofmann ❤ 4%: Basics of Bass boxes ;)

@DIYAudioGuy 18 дней назад

What is not to love? The guy did some awesome stuff!

@areasonablethought610 2 года назад

This guy looks just like my doctor whom I have to see tomorrow morning. Hopefully I get some good news from the visit.

@DIYAudioGuy 2 года назад

Good luck!

@Chase1297 Год назад

Hey if a manufacturer recommended a 3 cube box, how much larger would you make the box (generally obviously). 3.5? 4? 6? How much larger do you generally go

@DIYAudioGuy Год назад

I plug the TS parameters into Win ISD and let the software figure it out. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yZNeYBYGRKk.html

@johannjohann6523 Год назад

Interesting video. I've been trying to figure out some of this subwoofer stuff, and not sure size always is the key feature for subwoofers. I consistently see 10" and 12" subs that rarely go below 35 Hz. Yet I have an 8" JBL sub rated at 18 Hz - 800 Hz (which I'm sure to many that 900 Hz is on the high end of a sub). The box came with the sub, and though I have not tested it, I can say yes it does play lower notes than to subs that are in the 35 - 40 Hz range (I do have exceptional hearing, and proof humans can hear below 20 Hz and above 20 Khz. But I have terrible eyesight, and think one sense made up for another. I'm just glad it was my ears instead of sense of smell. lol). But I too always thought a larger subwoofer driver was needed to hit down to the 20 Hz mark, like a 15" or larger. So how are smaller subs able to achieve this ? Please, I seriously would like to know as I am somewhat confused maybe? And I am having a hard time locating anything about a driver's ability to reach to low end Hertz like a subwoofer. It seems to me you would always want a sub to go down to 20 Hertz otherwise you are cheating yourself. And one reason I ended up with the JBL I do as it is hard to find subwoofers that reach that low of Hertz. Which really surprised me.

@DIYAudioGuy Год назад

It is all about the interaction between the enclosure and the drier.

@NSluyter Год назад

If they go lower they go less loud (hofmann law)

@freddiemoreno01 2 года назад

@DIY AUDIO GUY any recommendations for a Sundown audio ZV5 15 enclosure? Looking for SPL mainly

@DIYAudioGuy 2 года назад

You looking to build your own, or are you looking to buy one?

@freddiemoreno01 2 года назад

I wanna have a custom one built but I wanna make the right choice for the sub. Basically only listen to rap.

@-Savage- Год назад

I'm looking to build a triangular box for 2 8s for my trunk. Space saving in mind. I do want it to be functional. It'll sit tight behind my rear seats. Looking for any info that will help me calculate the box design. Thanks

@DIYAudioGuy Год назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yZNeYBYGRKk.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-NjolI-OEHE8.html ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE--s78YDDwB0I.html

@unbanmy360 Год назад

Does polyfill make the box act larger? Or does it just help with standing waves

@DIYAudioGuy Год назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-ZQ0WvSKfDVY.html

@rikardekvall3433 2 года назад

Great. At 3.05 you spoke about the great passive radiator. At 0.48 you flipped around the MK Boombox. I would like to build the MK Boombox but I find it a bit to big/deep. Can’t you redesign it with two passive radiators instead for the ports? Us the same kit, but only cut and remodel the box, that are included in the kit, so we beginners DIY have something to do during winter. Keep up the great work.

@DIYAudioGuy 2 года назад

A lot of people seem to build their own (or modify the kit). As far as making the kit smaller/using a PR you can just model in WinISD. You will need to relocate the amp, it takes up the full depth of the kit.

@rikardekvall3433 2 года назад

@@DIYAudioGuy Thanks. I need to learn how to use WinISD. So handy you just recently made a tutorial! Keep up the good work.

@DIYAudioGuy 2 года назад

@@rikardekvall3433 There is a bit of a learning curve, but it is a great tool and the price is right.

@randyrawdingii5135 8 месяцев назад

I've seen your vids off and on the past few years, looking up different things. As a drummer, I've always appreciated hifi audio/quality equipment but focused more on the headphones/earbuds space. After a few incrementally improved installs over the years, and dreaming about my ideal setup, I'm going all out; h/u, 3 way active front stage, rear fill, custom sub box, some strategic sound dampening... But what in the sam hell have I done, other than NOT HIRE A PROFESSIONAL... Thanks to this gem I now know OF COURSE there's a sub box CAD? program🤦‍♂️ And now (at 35) I don't have to go ask my dad to do his hocus pocus voodoo math wizardry when I eventually build my box. The more I learn, the more I realize how much more I have to learn... I'll be seeing you, I'm sure LOL. Thanks for the great content. God bless!

@DIYAudioGuy 8 месяцев назад

I totally get that. I feel like I've just scratched the surface! There's so much more to do and so much more to learn.

@proffessasvids 3 месяца назад

The issue with the enlarging the cabinet is you end up adding efficiency to the low end only. The problem is you rob energy from the top end to do it. Same with large port area. Yeah it's awful loud around the box tuning but it rolls off very fast above there in the range. Boxes that are too large for a driver with introduce mechanical distortion into the range around a half octave above the port tuning due to the mismatch in damping. You'll also find you run into xmax limits very quickly in an oversized cab. So in summation, Hoffman iron law gives you low end extension at the cost of high end extension. All you are doing is moving the playable band, down the range and shortening it at the same time (low bass one note wonders). I grew out of iron law boxes many years ago when I realised the bandwidth drawbacks. It's a great way to get cheap woofers loud at low frequency but you'll soon get bored with only being able to play your tuning specific decaf tracks. Everything else with transients in it or upper bass will sound muddy and 10 minutes behind everything else. You'll also get bored of wearing out woofer suspension if you are competing like this. Xx

@totalkaos6969 Год назад

What is the length and size of port do I need for this? SKAR ZVX 12-2. 3.0 CU BOX. THANKS

@DIYAudioGuy Год назад

I am not taking on enclosure design clients at the moment.

@gabrielvieira6529 2 года назад

I can make a subwoofer speaker box for a 4-inch woofer based on two subwoofer boxes, one 6" and one 4-inch, mixing the sizes, averaging the two sizes, putting in a longer port, and making a "5-inch subwoofer box" but using the 4-inch speaker? I'm looking for lower bass than the two subwoofers I have, merging the box sizes maybe can make that happen? I don't want it to be really loud, I just want to hear better low-end bass, if that's even possible with that little of a driver... (i think between 45 Hz they die, I don't know if this build can play low to 35hz...) I don't have the specs for the woofer...

@DIYAudioGuy 2 года назад

I would just model it in WinISD. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yZNeYBYGRKk.html

@xxxYYZxxx Год назад

Funny, I'm using classic 2" A/R mids in my car audio system. They were new old-stock on P-Express, and no longer available. They screw right into Dayton indoor/outdoor speaker pods I've mounted on my dash, mated to Dayton 1x4" ribbon tweeters. I'd have bought more if I'd know how useful they are.

@DIYAudioGuy Год назад

Sweet! I bet those sound great.

@xxxYYZxxx Год назад

@@DIYAudioGuy I haven't found a better 2" mid on P-E, at least for RMS & Sensitivity. The sound isn't objectively better than my home system, but using pods eliminates door-resonance altogether, and dash-mounting makes for better stereo imaging than I'd previously though possible. I put a 12" Dayton UM sub box on the passenger floor! Upfront, I can low pass the sub at 200hz w/o imaging problems, so the pods never get any cone-shredding bass.

@DIYAudioGuy Год назад

@@xxxYYZxxx in a perfect world I would build a system with subwoofers up front in both foot wells.

@xxxYYZxxx Год назад

@@DIYAudioGuy At one time, I stressed over the idea of putting a subwoofer in the passenger foot well of my WORK TRUCK that NOBODY every rides in, then I came to my senses about priorities. Amazingly, Goldwood makes a wedge shaped 1.25ft^3 box that barely just fits almost exactly into the available space, like the built it that way on purpose.

@BaddDukk 2 года назад

320amp otternator.... lol. Seriously though - nice video. Power is so cheap and drivers so specialized these days that we are spoiled with tiny enclosures. I remember dropping Rockford SP-412s into 3cuft each and it was a compromise!

@DIYAudioGuy 2 года назад

For sure! We live in interesting times!

@dougtond1380 2 года назад

this was a great explanation. Now, to peruse your channel for passive radiator information

@DIYAudioGuy 2 года назад

I've got a couple of videos where I use some passive radiators, I think one of the very first projects I built for the channel was a passive project. Perhaps it's time to make a nice video on passive radiators?

@dougtond1380 2 года назад

@@DIYAudioGuy I saw that. I started watching some of the PR videos, but I've never heard a solid explanation on how to come up with enclosure dimensions or proper weight of the PR, etc.

@snhongo1 2 года назад

Hie ...please can you do a video of examples of how to calculate different size boxes using this formula...

@DIYAudioGuy 2 года назад

Unfortunately the formula does not give a full picture of how a subwoofer will perform, only the pass band efficiency. That is why I recommend this: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-yZNeYBYGRKk.html

@snhongo1 2 года назад

@@DIYAudioGuy ok thank you

@jasonmcedward2595 Год назад

DIY, you have any plans for 2 12 type R Alpines? I need a new box, please

@DIYAudioGuy Год назад

I do not, but I can draw some up. bit.ly/3IwIJLb

@kaedeschulz5422 12 дней назад

I always try to get as much air movement in as small of a box as possible. I like to use driver's that don't need much volume and have a high Xmax like for example an SB23MFCL-4 with 12mm Xmax or a Ciare 12.00SW with 14mm Xmax and put them into a Tapped Horn. For both driver's i have designed Tapped Horns that go down to 13hz. A friend is currently building the one i designed for 2 of those Ciare 12s and he will build 4 of those Dual 12 TH and together they will be capable of generating 127db down to 13hz at 1meter outside according to Hornresponse. Each sub has a outside Volume of 655Liters and does 91db at 1watt. Inside and corner loaded those could probably cause some SERIOUS injury to human and the house they are placed in.