Fiddling with inter-channel phase ....
A newly joined member says that he has had good results with this DSP room correction system here: http://www.audiovero.de/en/
It seems that they have a demo version?
One thing I have to report about a DSP system I've been experimenting with: the system calculates and introduces an inter-channel time delay of a few thousandths of a second. This significantly changes the quality of voice, 'cleaning it up' etc. etc.. However, if the DPS remains in circuit but this delay is overwritten and set to zero, voice returns to its normal characteristic, and even though the overall speaker/room response remains a flat line (or whatever line you program).
The worrying thing is that the magic effect and definitely audible change is seemingly related to nothing more than the inter-channel phase difference, the ear being astonishingly tolerant of all the normal room's usual sonic lumps and bumps. Was I disappointed ....
Alan A. Shaw
Harbeth Audio UK