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RE: Another First Reflection Trap (FRT) Adventure : Quasi-Ambiophonics

Posted by josh358 on March 4, 2017 at 06:42:20:
Hi STC,

Sorry if I wasn't clear but I listened to the preprocessed files without the barrier -- I used the barrier to listen only to unprocessed files. The barrier worked brilliantly even though the speakers were at the standard 60 degree angle, but I couldn't get the preprocessed files to work very well even though I tried the panels at the recommended angles and tried listening at various distances. I did get a spread beyond the speakers when I was in the sweet range, but it was actually less of a spread than what I get with the speakers at 60 degrees and no crosstalk cancellation.

I have Tympani IVA's in split configuration so the woofer panels are separate, and timed differently. However, the crossover from woofer to mid-tweeter panels is 300 Hz third order and as I understand it in the RACE algorithm the bass below 400 Hz bypasses the crosstalk cancellation. The separate panels also didn't have a deleterious effect when I used the barrier.

Maybe I should try the panels even closer together? I thought I had them at about 20 degrees or less. As others have mentioned, though, the Maggies have side-by-side mids and tweeters whereas you're using the crossoverless Soundlabs and I'm thinking that the lateral displacement of the drivers may be interfering with the crosstalk cancellation since the acoustic centers are laterally displaced by about 5":

Also am I correct that the greatest effect of the XTC is at about 1 kHz? In which case maybe I should optimize the distance for the midrange units -- will try it again using that as a parameter. Meanwhile, I ordered a copy of AmbiophonicDSP to play with.

I'm impressed that you're doing convolution! I'd love to do that but I didn't see a way to make it practical. Don't the inexpensive home theater speakers reduce the quality of the sound? I assume you got the impulse responses from the source mentioned on the Ambiophonics site, but I'm curious about what you used for amplification and DA conversion and what you're using for the convolution -- will JRiver handle that many channels? Have you written this up somewhere? I'm intensely curious -- it's something I'd love to do.