Thank you.
You don't think using a panel beside each speaker will achieve much then?
I asked about frequency range because of it relates to panel thickness.
The problem for me is that currently I use a CD Transport, digital EQ and DAC (with no USB input) all connected with balanced XLR cables (the equaliser uses only balanced XLR).
Most of the software or hardware seem to be impractical in my current set up.
BACCH either offer very expensive hardware or Mac based software.
You are facing the same dilemma I used to DAC. Despite knowing about Ambiophonics in early 2000, I refused to let go my Theta DAC and Transport and then Marantz SACd and Sony multi channel SACD. In 2009, built a dedicated room and had a good stereo system. Then I tried again with Minidsp Ambio with the intention of modifying it so that it could accept XLR from preamp to Amp. Luckily, the Suptratek and Classe Amp had RCA and XLR option. Tried that and after about a year. Sold everything and bought a Motu24Ao for virtual hall and a Crown to drive Sound lab ESL. Ambio is a different world, it will outclass stereo playback easily even with cheap equipment. Search for Howard Kneller of Soundstage review of Ambiophonics to understand the difference.
Panels are not going to work well if you cannot prevent the sound from 200 to about 5000Hz reaching the opposite ears.
Email Ralph if you need help with your current setup.
Cheers!