Setting up my new Yamaha RX-A770 (Ohms)

Discussion in 'Home Theater & Video' started by Steve Pratt, May 15, 2018.

  1. Steve Pratt

    Steve Pratt New Member

    Messages:
    8
    Just joined this forum and just purchased my new Yamaha RX-A770 AVR.

    I've been reading through some of the posts and got stuck on the one for setting up the ohm settings for the speakers.

    My fronts are Definitive Technology BP-10s. The specs say Nominal Impedence of 6 ohms.

    My center is also DT with Nominal Impedence of 8 ohms.

    My rears (Rock Solid) with Nominal Impedence of 8 ohms.

    When I set these up do I need to select either 6 or 8 or can I set them up individually? I haven't opened the box yet.

    Thanks,
    SP
     

     

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  2. drumbum

    drumbum Super Member

    Messages:
    1,092
    If either on screen or a switch on the back, leave at 8 ohm setting.
     
  3. donprice

    donprice Wound up workin' at a gas station.... Subscriber

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    2,213
    Leave it at 8 ohms. The 6 ohm setting probably does more harm (to the sound) than good.

    Hint - if the amp is running reasonably cool (i.e. not overheating) then it is OK with the load it is is seeing. I ran ~4 ohm speakers on my Yamaha RX-V2500 and RX-A2010 for years with no issues - however, they were high efficiency speakers so the amp really did not see a high power draw under normal listening conditions. Pushing low efficiency speakers at high volumes requires more power than an AVR is designed to deliver. Yeah, that's real scientific stuff so just go by how hot it gets and if it goes into protection mode then you need to change something.

    Come to think of it, I have the older RX-A710 in the bedroom and zone 2 pushes a pair of 8 ohm outdoor speakers in parallel for a nominal 4 ohm load. No problems but I don't crank them out of respect for the neighbors.

    Welcome to AK and the Yamaha family :beerchug:
     
  4. charles 1973

    charles 1973 Super Member

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    2,964
    Setting the speaker impedance on my Rx-A770 requires holding down the straight button and pressing the main zone button to begin the 5 step procedure. The unit has 2 settings. Factory set at 8 ohms for all speakers, or the 2'nd position which is 6 ohms. It allows for 4 ohm front speakers and 6 ohms for the 4 surround channels. I was worried about it's 4 ohm capability, But from the research I have done, There doesn't seem to be any problems in that respect.

    The popular consciences among many audiophiles and some professional reviewers and service people alike is to leave the unit on the 8 ohm setting even with 4 ohm speakers unless you have a problem (like overheating or the protection circuit shutting off the amp). I think you will be fine leaving it in the 8 ohm setting.
     
  5. StimpyWan

    StimpyWan AK Subscriber Subscriber

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    Location:
    Blue Ridge Mountains!
    As the rest have stated, always use the 8 Ohm setting. It delivers the most power and current. The 4/6 Ohm selection, actually current limits the power delivery, in order to protect the AVR. So, if the receiver stays cool, in 8 Ohms, you're good.
     
  6. Steve Pratt

    Steve Pratt New Member

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    8
    Still haven't found the 8 Ohms setting.
     

     

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  7. donprice

    donprice Wound up workin' at a gas station.... Subscriber

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    8 ohms is the default setting. See page 21 of the owners manual.
     
  8. Steve Pratt

    Steve Pratt New Member

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    8
    Thanks. I did see that, but unless I'm missing something there, they left out an important step... and as a result, page 21 did nothing for me. This video shows that the power needs to be OFF before pushing the buttons. Kind of important. Going to play with it some more after I get this first cup of coffee down:
     
  9. Steve Pratt

    Steve Pratt New Member

    Messages:
    8
    I'm a little confused about this Screen:
    On Screen > Scene > TV or Movie Viewing > Load > Detail.
    I used the YPAO MIC to set up my speakers, and when I went in here "Surround" was NOT checked. Should this be checked or not? TIA
     

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  10. charles 1973

    charles 1973 Super Member

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    That screen is specifically for HDMI control. From what I can gather after reading the manual, HDMI control allows another AV audio input while using a compatible HDMI device. For most of us turn it off.
     
  11. hemiram

    hemiram Active Member

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    155
    Location:
    Toledo, ohio
    Just leave it at 8 ohms. There is no benefit from setting it otherwise.
     

     

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