Originally Posted by jjclecky
Would the denon 2112 be powerful enough?
At 90 watts into 8 Ohms and 125 watts into 6 Ohms, and the designation as having "Low Impedance Drive Capability", but no spec for 4 Ohm wattage output, I would be a little leary of the 2112 being powerful enough, especially if you want anything close to full Reference Level. The Klipsch Ref Line can have impedance dips to 3 Ohms or lower at port tune. I haven't seen an impedance curve on the RB-61ii, and I don't know if they exhibit this issue. However, if I owned these speakers, I would want more than 90 watts at 8 ohms driving them. I also don't know how accurate the Denon spec is, or how much the power supply limits the current delivery in multi-channel output modes. If the power supply is the limiting factor, then, in situations where there is high levels in all the channels simultaneously, AND there is high levels around the port tune of the speakers, the power supply may not be able to deliver enough current to cover all the needs. The net effect is amplifier clipping, and that clipping will make the tweeters sound overly harsh. It can also cause tweeter damage, although the distortion would likely cause you to turn the levels down before tweeter damage would occur.
One way to deal with this is by adding external amps for the main channels. However, the 2112 doesn't have pre-amp outputs so this would not be an option. I would look for another receiver with higher output, or pre-amp outputs that allow for connection of an external amps.