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Why is good, deep bass so difficult? - Myths and their Busters

This is a theme that goes round and round and round on Audiogon. While looking for good sources, I found a consultancy (Acoustic Frontiers) offering a book and links:

http://www.acousticfrontiers.com/guide-to-bass-optimization/?utm_source=CTA

Interestingly: AF is in Fairfax, CA, home to Fritz Speakers. I really have to go visit Fairfax!

And a link to two great articles over at sound and vision:

https://www.soundandvision.com/content/schroeder-frequency-show-and-tell-part-1
https://www.soundandvision.com/content/schroeder-frequency-show-and-tell-part-2

Every audiophile who is dissatisfied with the bass in their room should read these free resources.

Let me state unequivocally, deep bass is difficult for the average consumer. Most audiophiles are better off with bass limited speakers, or satellite/subwoofer systems. The former limits the danger you can get into. The latter has the most chance of success IF PROPERLY IMPLEMENTED.

The idea that large drivers/subs are slow is a complete and utter myth. Same for bass reflex. The issue is not the speed of the drivers. The issue is usually that the deeper a speaker goes the more it excites room modes, which the audiophile is then loathe to address.

Anyway, please read away. I look forward to reading comments.
erik_squires
dlcockrum's avatar
dlcockrum
2,105 posts
 
Hi Erik,

Roger on the cost. Plus having to build the chamber.

Sounds like you get a lot of low bass. Do those woofers also load the room?

Dave 
erik_squires OP
5,268 posts
 
Dave, I'm now in a completely open floorplan, so no room loading. Previously, yes!

Rather than the Behringer, I like the miniDSP line. Easier to control via windows UI, and I can feed it directly from OmniMic. I measure the response and then have OmniMic calculate a correction curve, and I'm done.

What I like about OmniMic is my ability to tailor the target curve. I usually go for a 1 to 2 dB/octave descending slope starting at 16-20 Hz for the sub. JL does a similar thing.
wolf_garcia
4,650 posts
 
This thread is a bass fishing tournament.
hifiman5's avatar
hifiman5
1,611 posts
 
Don’t fear a creative solution.
1. Try decoupling your subs from the floor beneath them.

2. Mass load the subwoofer.

3. Use a sub with an adjustable "Q"

If you are listening in a square box (literally), good luck!
kijanki's avatar
kijanki
3,575 posts
 
Extension is only part of the sound and you don't need a lot of extension to listen to acoustic bass or bass guitar (lowest note 41.2Hz).  My current speakers, with larger woofers, have worse (by 5Hz) extension than previous speakers but bass sounds much better.  It is not extension or dynamics, but just sound of the bass (both bass reflex).  Attack and decay of the note sounds right (natural).  I also suspect that distortion is lower (woofers without spider-web suspension, larger volume).  

Previous speakers had 2 1/2 way xover meaning that one woofer covers bass and midrange while the other supports low bass.  That way it is possible to stretch extension from small woofers in smaller cabinets but it won't sound as good as larger woofer.

Most of the woofers have overhung motor construction that produces more distortions while only few manufacturers (Including Acoustic Zen) use underhung motor, perhaps because it requires much larger magnets.

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