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Thread: 4ohm question

  1. #1
    AR Newbie Registered Member
    Join Date
    Dec 2007

    4ohm question

    I just recieved the Denon 3808 receiver which comes set at 8ohms and am connecting Vienna Acoustics towers which are at 4 ohms. I believe I am able to change the settings on the receiver to 4 ohms, is this correct? And if I do this what wattage would I be pushing to the towers? The denon specs state that it is 130 watts per channel at 8 ohms

  2. #2
    Suspended Smokey's Avatar
    Join Date
    Jan 2004
    I would leave the impedance switch on Dennon at 8 ohm for maximum performance.

    Since 4 ohm speaker loads demand more current from amplifier than 8 ohm loads, the manufactures provide an 4/8 ohm impedance switch to protect the receiver over loading from lower impedance speakers. At 4 ohm impedance setting, the rail voltage on receiverís speaker output is lowered as to limit the current draw for 4 ohm speakers.

    At 8 ohm setting, full voltage is applied to receiver speakers output. So at this setting, your receiver can deliver more power. But be careful when receiver impedance is set to 8 ohm and you are using 4 ohm speakers, not to over drive the amplifier.

  3. #3
    Forum Regular pixelthis's Avatar
    Join Date
    Apr 2007


    AND even with the switch set to 4 ohms I'd still keep an eye on my receiver for a few days ,
    just to be sure its not running TOO hot, (it'll run a little hot)
    The power output will be a bit higher under 4 ohms, but it wont matter how much, you can only play them SO loud...
    should be in the owners manuel what the watts rating is at four ohms
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  4. #4
    Forum Regular blackraven's Avatar
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    Nov 2006
    St. Paul, Minnesota
    You should be fine with a 3000 series Denon receiver with a 4 ohm load especially if your speakers are fairly efficient. Where you run into problems is with cheap power supplies and inefficient speakers like my Magnepan's with a S/N of 85dB.

    Just make sure your amp is not getting too hot if you set the receiver to 8ohms.
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