Thanks! I have not created the filters for the (very small) system I am building, but as long as the Id software has convolution capability, I think it will work. 4 streams at 48kHz with 65,536 long filters doesn't take much horsepower and 65,536 at 48kHz should be enough. Basicallly I want to use the Id as an active 2-way crossover playing from a NAS. The Id, together with a 4-output USB audio interface (Scarlett 6i6?) is probably the simplest way to do that. My experience is that using Acourate to create filters that do the work of crossovers and room correction produces approximately the same benefit as spending 10x as much on (unfiltered) speakers and room tuning, while being physically much less obtrusive. You probably should figure out how to sell that concept!