I had my Apogee Duetta Sig's bi-wired, not a huge sound upgrade IMO. I had an extra amp of the same make but not the same model that I always wanted to try out in a passive bi-amp mode..so one day when I had to much time on my hands I gave it a try, this turned out to be a HUGE upgrade even though it is not an active bi-amp setup.
I could never go back to single amp setup now and will in the future explore active bi-amp or tri-amp setup with two subs. That said..some people do seem to report great results with bi-wire only..I did not hear it on the two systems I have tried it on in the past and don't think it's worth the extra cable cost.
Dave
