Originally Posted by magi44ken
Originally Posted by FMW
There is no such thing. Just connect the speakers and play away.
For my Yamaha, there is an option for you select 8 or 6 ohms settings. I wonder how does Pioneer knows what ohm speaker it use? Ohm matching is important.
Ohms matching is relatively unimportant for a well-designed Class AB or G/H amplifier. It can be important for some Class D (switchmode) amps. The Pioneer 522-k seems to have standard class AB power amps.
Most ohms switches on AVRs selected different taps on the power transformer to optimize the AVR to squeeze out the last watt possible without overheating during bench testing.
If you listen to music over speakers this feature should be irrelevant even when it exists. An AVR dissipates less than 1/2 to 1/4 as much heat while playing music as it does while playing pure sine waves on the test bench. Using speakers rather than resistive loads cuts out another 25-33% of the heat. The fact that almost nobody plays their system at full tilt boogie all the time makes further significant cuts.
If an AVR overheats in typical use, it means that it is in a poorly ventilated space, that there are problems with the speaker wiring or in rare circumstances either the speakers or the AVR itself is damaged.