I have a Marantz SR5005 that's a few years old, but still a very capable AVR. It's rated at 100W (20Hz - 20kHz, 0.08% THD, 2ch driven) x7, and I use it in bi-amp mode on my existing Polk RTi10 speakers .
I'm eyeing an upgrade to the Polk RTi12. Those are rated at 8 ohm impedance, 90 dB sensitivity. Will my Marantz put out sufficient power in bi-amp mode to run the bigger RTi12? From what I've read, they need a stout amp or else they sound really mediocre. Not interested in upgrading to bigger amps at this time, so if the SR5005 isn't powerful enough I'll hang onto the RTi10.
Marantz AVR & monoblocks + MartinLogan Motion 3.1 setup