Distributed Bass Array configuration

One thing to keep in mind: if you are using a sub (or four) with---I would certainly hope ;-) ---a low-pass filtered signal as its/their source, well, what is the slope of that filter? If only 6dB/octave (1st-order, as with the Vandersteen subs), that sub reproducing a, say, 80Hz signal, will be reproducing 160Hz (an octave higher) at only 12dB down. Who thinks a 160Hz wave cannot be located in space? How about 320hZ (24dB down)? Naturally a higher-order filter will change those figures.

If you run your sub(s) in mono, that mono output will extend further up in frequency that the frequency at which the x/o is set, the degree to which is determined by the slope of the filter. It is for that reason that some prefer employing higher-order filters (both high-pass and low) to integrate speakers and subs.

Doesn't surprise me at all 60ish khz effects bass perception...at that level, it becomes a 'physical' thing that likely vibrates your body hair...:)
Since you exist daily in an atmosphere soup, the reproduction of those fq adds to the 'reality' of the program....the suspension of disbelief...

I'll agree that L/R bass exists until the 'mono-ization' occurs, and it's all one motion due to wavelengths.  I like the concept of SWARM; smaller drivers quick enough to follow an amt...or a walsh. ;)

The thought of 'off the floor' placement in a smaller space (or a problematic one) has appeal...esp. looking forward to a new and improved place to hit 'reset' on my 'equipment'...*S*

(No recommendations, please. I agree with your selections; mine would likely bore or abhor but please me Enough.)

No, this is not occuring over this weekend.  I have important sloth to indulge in....plenty of time to run simulations.. *S*

-26db....*damn*  If fans bug you, your heartbeat and breathing are next..
Just teasing...don't stop. *g*

Happy 4 to all, play loud enough, J

Based on my experiences running a sound system, years as a bass phreak and a lifetime's work on my domestic rig, i can state with certainty that the ultimate bass is achieved by realising that bass is a part of the music, and should emanate from the same location, travelling in the same direction.

Sound is a pressure wave, and humans are capable of discerning the source of frequencies well below 20hz, let alone 80.
 Place one powerful subwoofer, crossed over below 40hz asymmetrically in a decent sized room and you will clearly, undeniably feel a difference in pressure coming from the side of the room with the sub.

I have enormous respect for the dba as a means to achieve excellent bass operating within parameters like cost , space and waf. 
But the ultimate, and most natural-sounding bass will be achieved from using main speakers with sub 20hz output, and stereo bass stacks sited alongside your main speakers, and firing in the same direction.( I go with a span's width between sub and main speaker.)
Furthermore subs need to be outside the main speakers if you plan on listening from the centre, and for most genres of music i bring the subs in at 40hz. Some dub reggae or deep house tracks get 54hz, but this can sound too thick with other tunes even of the same genre.

 In a nutshell, you have done all of the hard work deciding the best place to put your main speakers. In an ideal world, place your subs next to them. In a compromised world use the distributed bass array, and experience the enjoyable but artificial three dimensional effect described elsewhere.

In terms of using stereo or mono bass, i generally continue to fall into the same trap of imagining that bass is part of the music and should be treated the same as the main signal. By the time you are adding four or more subs you will have output to spare so there's no advantage to quadrupling a mono signal. However i am sympathetic to using mono bass to cope with imbalances caused by triggering room nodes.

I did try the Trinnov pre amp, but the Wavac pt-t1 tanned it's behind.
If your system is already correctly time aligned in analogue by having each drive unit the same distance from the listening position, there is nothing to be gained from the Trinnov's digital time correction. The dealer was crestfallen, he could clearly hear the same thing i did.

All that was left was the character of the pre amp, and my preference for a valve pre amp remained intact. Fortified, even.

< 20 - 60 hz is considered SUB BASS. It is MONO, I don't care what you do to it. BUT if there is a left and right SUB bass signal from the source that is replaying via the MIXED recording, you can't just use the left or right signal and call it good. 

I've read here on AG countless times "it makes no difference because its MONO", use either the left or the right output. NO!

You have to use BOTH LEFT and RIGHT signals to play the WHOLE bass track...

Second. BASS is directional PERIOD.. 60 - 80 hz is transitional from SUB to BASS. BASS is 80-250 hz. 

The problem is the decay rate of ALL the lower frequency waves 80 < loading the room and BOOMING.

I went to GRs OB servo system.. FIXED that problem, right NOW! BOTH sided of the cone are in the room. How simple is that? The only place and WAY OB works for ME.
It has a step baffle and a pretty well programmed firmware chip.. Rythmik plate amps.

The other problem is overshoot from 80-250 hz (where ALL the SLAM is).

THAT is where a lot of systems get sloppy from MB to MIDS, they get muddy and OVER-exaggerated low mids.. or bloated? I can't stand when the congas SUCK. or Cher's voice.. :-) A baritone girl or a Contralto (to be correct) sound bad.. 

I direct couple the MB columns to serious class d 12k pro amps.. and use an active full blown DSP XO. It Fixed the overshoot problem for the first time without a (SLOW A$$) VERY EXPENSIVE accelerometer set up.. 1/10 the cost..

There is a difference in SUBs and BASS BUT I keep seeing the TWO used as if they were the same thing.. I use two different drivers for TWO different things.. More floor space but a much bigger smile. :-)