Question about Yamaha RX-V659 Receiver

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Speaker impedance and the Yamaha RXV 463

I have 2 sets of speakers that I'm wanting to connect to this amp.  One set is 4 ohms (old speakers) and one is 8 ohms.  Can I do this?
The manual indicates that I can manually set the impedance to 6 ohms.  Should I set the impedance manually for 6 ohms and hook up all the speakers?  I don't see that I can manually set only one set of speakers at 6 ohms.
So, am I taking any significant risks by hooking both sets of speakers to the same amp.  I did this with my previous amp and it seemed to work ok, however, one channel did fail but I'm not sure that the problem was the impedance.  Your thoughts?
bob patterson

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  • robert w pat Aug 05, 2008

    ginko, thanks for your feedback.  Just to make sure I understand, the higher the number for impedance of a speaker (ie 8 ohms), the LESS efficient the speaker and the more power it takes to run the speaker.  Or, it is the opposite, the HIGHER the number, the MORE efficient the speaker.  So, when and if, I manually set the amp to accommodate  6 ohm speaker, I'm telling the amp to get ready to operate with LESS efficient speakers that it is set up to do.  Have I got this?

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  • Yamaha Master
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You risk to crash a set of speakers. In any case this will have a detrimental effect on the sound

Posted on Aug 04, 2008

  • Ginko
    Ginko Aug 04, 2008

    If you do not pump the volume it will work fine , device impedance is 6 ohms, I do not think it will damage the 8 ohms speakers, only the result in terms of surround and sound distribution won't be better than using two 4 ohms speakers.

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Posted on Jan 02, 2017

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Want to use my current speakers with a new surround sound system. Current system is 5.1 channels, rated at 100w per channel @ 8. Ohms. New System is rated 145watts, 5.2 channels at 6 Ohms. Will b ok?


Hi Ronald.
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