Originally Posted by Syzygy
From whence did you get the comment "as long as you're willing to live with the volume limitation"
? It's not in the manual.
Page 11 of the manual under PROTECTION CIRCUIT reads ....
"Also, if replaying large sound levels
by using a speakier having an impedance less than that specified (eg. 4 ohms), the temperature will rise and the protection circuit might be activated. The power supply will go into the standby state, and the power indicator will flash red at 2 second intervals."
Clearly it does not say you "cannot" use 4 ohm speakers here. What it does imply however, is that if you do use them, you just have to be careful about raising the volume to high, which is why Denon doesn't rule out using them.
In the FAQ database on the Denon website it says:
"If using 4 ohm rated speakers, common sense should always be taken as to the volume level setting, as it is easier to overdrive or "clip" an amplifier with 4 ohm speakers than with speakers with a rating of 6~16 ohms. "
The bottom line is that with a lower resistance to energy flow (ie 4 ohms), the more wattage (heat) is generated at a given volume setting compared to the same volume setting with higher resistance speakers (ie 8 ohms). Therefore you can use "any" speaker with this AVR as long as you don't set off the Protection Circuit, which just means figuring out the highest volume you can safely use and don't go above that. Bigspur seems to have found his limit at -15db. The AVR lets you set the Volume control maximum _-20, -10, 0, OFF) at MANUAL SETUP - OPTION SETUP - VOLUME CONTROL (probably selecting -20db to be on the safe side if others are around in his case) on p. 35 of the manual. Even though I've got 8 ohm speakers, I have the max volume set to -10 so the kids don't inadvertantly "clip" the speakers when playing their games.