Join Date: Aug 2001
Location: Lexington, KY, USA
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The 6ohm/8ohm mode is confusing on onkyos. Basically if you set it for 6ohm, it reduces the amplifier power and handicaps your receiver so it won't overheat with a 6 or 4 ohm load.
From a while back I have read that you basically always want to run it in 8 ohm mode to get full amp power. Put a fan on top to cool it down. If the onkyo you have can't handle the 4 ohm load in 8 ohm mode then you probably need a different/more powerful amp.
I have been running 4 ohm speakers Axiom M80ti (very easy 4ohm load) on my TX-NR876 and now TX-NR818 with both of them set for 8 ohm. Never had the receiver shut off or overheat. Always had a 120mm fan on top in the back blowing up.