Tom, your on to it with your suggestion of separate multi-ch power amp to bi-amp L&R speakers and use your Arcam for other speakers.
For now, if you Arcam is a 7.2 avr and allows bi-amping L&R speakers you'll notice a step up in sound w/o investing any money for now. I use a Yamaha 140 wpc 7.2 amp and I'm able to allocate 2 rear surround channels to the front L&R for bi-amping and noticed improved sound from front speakers.
For now, if you Arcam is a 7.2 avr and allows bi-amping L&R speakers you'll notice a step up in sound w/o investing any money for now. I use a Yamaha 140 wpc 7.2 amp and I'm able to allocate 2 rear surround channels to the front L&R for bi-amping and noticed improved sound from front speakers.