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Re: Welti comments

71.118.141.169

I didn’t realize my paper(s) had caused such a commotion! A few comments:

“I regret that the article fooled you into that assumption -- it fools most readers because it is poorly written.”

I don’t know how it could have been stated any clearer…
"1 INTRODUCTION
This paper concerns low frequency optimization in small to medium sized rooms with multiple subwoofers and multiple listeners. "

The paper is relevent in cases where there are more than one listener, with their heads not occupying the same space. Of course it is more relevent when they are a couple of feet apart or even more if there are several seats covering a substantial portion of the seating area. Yes, its true that this would most often be the case in a home theater situation. If you are only concerned about the “stereophile sweetspot”, you shouldn’t have much to worry about. Get a good parametric eq.

“No real room measurements for Welti”
Reread the paper please. (“How Many Subwoofers are Enough?”,)

“Only one virtual room used by Welti to represent all real rooms!”
Reread the paper please. (“How Many Subwoofers are Enough?”,)


“No concern about bass quality (or even measurements) in the ONE sweet spot for two-channel audio”
Stated clearly in the paper.

“No concern about subwoofer-front speaker integration.”
Lots of concern, but for the multiple seat situation where that is really a PROBLEM.

“It may be possible, after months or even years of trial and error, to find positions for multiple subwoofers that are optimal for ONE seating position in ONE room ... but ONLY if you ignore the quality of subwoofer/main speaker integration (the quality of the front soundstage), which is the most important attribute when using a subwoofer(s) in a two-channel audio system, IMHO.”
Please read ““In-Room Low Frequency Optimization”, Sept. 2003, AES preprint 5942.” It is possible. There are consumer devices coming out soon.


“(3) Full excitation of the first-order axial floor to ceiling room mode (as every subwoofer on the floor fully excites that room mode) causing a NASTY bass peak in the 69 to 73Hz. range (eight-foot ceiling).”

This is part of the typical misunderstanding of room modes: thinking only of the excitation, and forgetting the second part – where the ears are (closer to the null of that first axial mode than not in this case).



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