Hello again,
If you wanted to add a competitive discrete power amp to drive the single "back" channel, take a look at the Marantz MA-6100 125-watt THX Mono Power Amplifier. It has excellent specs, a high-current power supply, and it's affordable ($330 US sugg. retail).

Regards,

Alan Lofft
Axiom Resident Expert

Alan Lofft,
Axiom Resident Expert (Retired)