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Onkyo 875
#251026 03/10/09 04:57 AM
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drewy1 Offline OP
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Has anyone used the Onkyo 875 with their M80's? I know it has an impedance switch (current limiting) for 4 ohms but I would rather run it in 8 ohm mode to utilize full current. I can get one for a great price but I am concerned about it cutting out.

Re: Onkyo 875
drewy1 #251029 03/10/09 05:31 AM
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Sound and vision did a bench test with this unit and found that it produced 320 watts per channel into a 4 ohm load with the impedance switch set to 6 ohms, not 8 or 4. With the switch set to 4 ohms the receiver only put out 55 watts, hence the reason why I would not want to buy this receiver if it had to run in this mode.

http://www.soundandvisionmag.com/receivers/2463/test-bench-onkyo-tx-sr875-av-receiver.html

Re: Onkyo 875
drewy1 #251030 03/10/09 05:50 AM
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I don't think we've heard of anyone having problems with M80s and an 875, but I'm not sur we've heard of anyone using one, either. I'd definitely leave it in 8 ohm mode (whatever standard operating mode is) to prevent that sort of current limiting.


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Re: Onkyo 875
drewy1 #251035 03/10/09 06:26 AM
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But you don't have to run it in that mode, so don't worry about it.


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Re: Onkyo 875
JohnK #251036 03/10/09 06:31 AM
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No I don't have to run it in 4 ohm mode, but will it cut out or overheat if I run it in 6 ohm or 8 ohm mode?

Re: Onkyo 875
drewy1 #251037 03/10/09 06:34 AM
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Not unless you'd like to play it loud enough and long enough to permanently damage your hearing.


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Re: Onkyo 875
JohnK #251038 03/10/09 06:36 AM
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drewy1 Offline OP
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Fair point.

Re: Onkyo 875
drewy1 #251047 03/10/09 12:34 PM
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leave the switch on 8 ohm. ;\)


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Re: Onkyo 875
SirQuack #251150 03/10/09 06:48 PM
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Someone had the 875 around here, because we were comparing it to the 806. As I recall they were really happy with it (and the specs seem to support that impression) but I don't recall the speaker - but odds are it was the M80. Search the forum for 875 and you should find some comments that ease your concern. I was looking at the 806 and 875 and came away satisfied the 875 would handle my PSB's which, like the M80, run down to 4 ohms sometimes.

Hope that helps.


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Re: Onkyo 875
drewy1 #251175 03/11/09 12:06 AM
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 Originally Posted By: drewy1
Has anyone used the Onkyo 875 with their M80's? I know it has an impedance switch (current limiting) for 4 ohms but I would rather run it in 8 ohm mode to utilize full current. I can get one for a great price but I am concerned about it cutting out.


I had the 875 for 1.5 years with M80s and never once had any issue whatsoever with driving a 4 ohms. I now have the 876 and it continues to work flawlessly. I have a 7.1 system. There is no way that I can set the volume to the max without killing my ears (I have a rather small room though: 20'x15').

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