This is simply incorrect. So that we can get our terminology straight, to me, midbass lies above 100 Hz. Everything below 100 Hz. is simply bass and there are precious few musical instruments which have fundamentals in this region.

In the modal (bass) region things like distances to the sources crossover frequencies and the like have little to no real meaning. And talking about 100 Hz (the upper limit of my multiple sub implimentation) as being "run up through the upper bass to lower midrange" is ridiculous. In the modal region the complexity of multiple subs is Exactly what one wants.

There are two issues here. One is the use of dense interference to smooth room modes. The other is of integration with mains, considering crossover points and slopes and distance between subs and mains.

Dense interference can be accomplished at 100Hz using closer spacing than is required for dense interference at 35Hz because of the wavelengths involved. I'm saying I think probably it is worthwhile to have closer-spaced overlapping midwoofers for modal smoothing, and further spaced subs. The further subs might be arranged symmetrically as Welti suggests, or randomly as you suggest. But the nearby overlapping midwoofers should probably be symmetrical, to provide better imaging. They're the transition drivers, used up to the end of the modal range. They would work something like a traditional line array, but used only up to the Schroeder frequency.

I think I understand your concept, its strengths and weaknesses. How about you? Do you understand what I am saying?

"I'm saying I think probably it is worthwhile to have closer-spaced overlapping midwoofers for modal smoothing, and further spaced subs." i.e. non-Welti, or Geddes, a sort of Parham arrangement.

Below 100 Hz "integration with the mains" is irrelavent - it is insignificant. Thus, to me, your "issues" are simply not relavent. And your argument for symmetric placement is weak because it will always yield a higher spatial and frequency variance than a random or partially random placement will and there are no "integration" issues.

I never said that I "crossover" above 100 Hz, and I don't know where you got this idea. The only "crossover" would be at 50 Hz from the Summas to the VLF sub. The other subs don't crossover anything, they just augment the mains and simply fade away being down by about 6 dB at 100 Hz. with a very steep fall above about 120-150 Hz. So there is no potential for the things that you are ranting on about. This was all in my previuos posts, maybe not this concisely stated, but it was there. You seem to make up a lot of things that I never said.

• Computer Simulation of Room Acoustics