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speakers on/off

Discussion in 'Electrical Engineering' started by Dan Caputi, Jan 25, 2006.

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  1. Dan Caputi

    Dan Caputi Guest

    Apologies for the simple nature of this question. I would have posted on an
    "audio" group but I'm afraid of getting biased answers (not to mention
    getting "ripped a new one")...

    I want to control (on/off) a pair of remote speakers. Can I combine the
    minus (L- and R-) leads and switch that using a single SPST switch? I'm
    *pretty sure* my amplifier uses a common earth grounded return on all

    - Dan C.
  2. JohnR66

    JohnR66 Guest

    Using a single pole switch on a common return is not a good idea. The
    Connecting the outputs through a load back to the other channel will not
    cause harm (common supply amps). It is the basis of bridge amplifers. Of
    course, in stereo mode, the common signals produced would cancel out,
    leaving a kind of surround effect. Connecting speaker loads between the +
    terminals of direct connect and capacitor coupled amps was used to produce
    the fake 4 channel sound back in 70s. Of course, this is not what the OP

    With capacitor coupled outputs, the amp output is biased at 1/2 the supply
    voltage. Connecting the outputs together through a load, no harm will come
    to the capacitors.

    Of course, this implies the amp is functioning properly with proper load
  3. TimPerry

    TimPerry Guest

    please dont do this. use a double pole swtch to break both speakers.

    your method will not shut the speaker completely off and the greater the
    stereo content (L-R) the louder the funky sounding audio will be. or if you
    adjust the L/R balance, the greater you turn the balance the more sound
    comes out... to 2 speaker wires out of phase.
  4. TimPerry

    TimPerry Guest

    assuming solid state electronics it's a non issue. tube equipment or
    something with a transformer output needs to have a load.

    many amps these days have the kind of switch we are discussing built in:
    where you can have "A" or "B" or both or neither.
  5. TimPerry

    TimPerry Guest

    what is bad about it?
    how can an amplifier 'blair' with no speakers attached?
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