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

Learn more about subwoofer design here: youtube.com/playlist?list=PL3Aot9dMXzXZ21MXAzvirEx…

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

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

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.

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

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.

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.

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!!

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

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!

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

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!!

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.

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

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

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

Love your passion and enthusiasm for science

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!)

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

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.