The unit will have a big improvement with better output opamps. I changed mine and it was very transparent. The main problem is the volume obtaining a 4-channel control. If you do the work yourself there are low cost kits and instructions on the web.

Another way to solve the biamp challenge, that is lower cost without some of the DCX pain, is by using 2 DEQs and sending the outputs to 2 DACs. I would use a quality DAC for the highs and a mid-fi dac for the lows (or the one in the DEQ?). The DEQ has a fair amount of attenuation to solve the volume ctrl problem, though a small pain, and I did not hear any sound deterioration through the Krell and Maggies that were playing. I plan to go this way as soon as I get feel the need to upgrade.

Linc