Monitor speakers really don't create huge demands on power amplifiers. The imedance can go down to 2 ohms, but it's not the difficult loads that hybrid speakers (ESL with dynamic bass) can produce. Also, the monitors are designed for bi-wire and not really for bi-amp application. Not that you can't do bi-amp with matching amps, it's just that it still goes through the high pass and low pass filters on the power side of the amplifiers. Also, you have the REL filling in that last octave or so. I would probably recommend a really great tube amp (ARC is probably a good choice as you are using their pre-amp and there is sysnergy with the two). I would also recommend bi-wire. Bi-wiring is often over rated and frequently give poorer results than spending the same amount on a good single wire with jumpers. In this case I have heard other Monitor Studio's (not the 12--they were larger models) and bi-wiring did offer an improvement.