I recommend a Yamaha A-S801 integrated amplifier. If you don't need the Video features of your AVR this will make your PSB speakers sound brand new and will pair well with any other new speakers you bring in.
I addition you can try the built-in DAC on the A-S801 via optical/coax from your Marantz - you might prefer that clean Sabre sound. Two upgrades in one!
I addition you can try the built-in DAC on the A-S801 via optical/coax from your Marantz - you might prefer that clean Sabre sound. Two upgrades in one!