Onkyo 818 6ohm /8ohm question - AVS Forum
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Old 07-24-2012, 12:22 PM - Thread Starter
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I just picked up the Onkyo TX-NR818. Would it be a problem to run 8ohm front and 6ohm center/rear speakers? I'm a complete novice and have no clue.

Thanks in advance.
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Old 07-24-2012, 12:47 PM
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It won't be a problem. There are a lot of people doing what you describe and don't even know it.
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Old 07-24-2012, 12:53 PM - Thread Starter
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Quote:
Originally Posted by KidHorn View Post

It won't be a problem. There are a lot of people doing what you describe and don't even know it.

Thanks I wans't sure and heard I could trigger the auto shutdown if the receiver runs to hot.
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Old 07-24-2012, 05:23 PM
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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. 
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Old 07-25-2012, 06:05 AM
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I wouldn't bother with a fan. Onkyo's run hot but are designed to be cooled via natural convection. As long as you have a couple of inches on the top and at least an inch on each side, you'll be OK. Receivers don't run hotter powering 6 ohms over 8. At least not a noticeable amount. The heat produced per decibal is more influenced by speaker sensitivity than impedance.
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