speaker a and speaker b

Discussion in 'Mac Accessories' started by benlee, Jul 19, 2007.

  1. benlee macrumors 65816


    Mar 4, 2007
    I have really good speakers hooked up to my receiver under speaker a. I want to add some others in another room under b but they are kind of crappy. Will this reduce the quality of sound coming from the good speakers?
  2. darthmullet macrumors member

    Aug 4, 2006
    it should have no effect on the quality of the other set. Just be careful with the volume control— the sets probably have different impedance and power handling capabilities so one set might be loud while the other is very quiet. Check your manual for more information on how to deal with that.
  3. aquajet macrumors 68020

    Feb 12, 2005
    That depends on the design your receiver.

    Receivers with an A/B speaker selector switch can be designed two ways: with the speaker switch internally wired in series or internally wired in parallel.

    Usually you can tell which design your amplifier uses by the minimum allowable speaker impedance for your amplifier. An amplifier which supports a 4 ohm load will usually have the speaker selector switch wired in parallel. But if it only supports a minimum 8 ohm load, chances are the switch is wired in series. The reason for this is because most home speakers are rated at a nominal 8 ohms. Two 8 ohm speakers wired together (which would be the case if you're running two pairs of speakers at the same time) in parallel will present a 4 ohm load to the amplifier, while two 8 ohm speakers wired in series will present a 16 ohm load to the amplifier. So in the interests of protecting its customers' equipment, manufacturers will try to dummy-proof their design as best they can. You don't want to run a 4 ohm load on an amplifier designed for a minimum of 8 ohms, which will likely fry your output stage. But a 16 ohm load on a rated 8 ohm amplifier is okay.

    To answer your question -- if your speaker switch is wired in series, it will likely affect the sound quality and will reduce the sound output from the speakers by half. But if it's wired in parallel, you shouldn't notice much of a difference, if at all.
  4. benlee thread starter macrumors 65816


    Mar 4, 2007
    Thanks. I just searched online and the receiver is parallel wired...

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