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Raising the amount of power going to one resistor?

Discussion in 'Electronic Basics' started by Jason, Apr 22, 2004.

  1. Jason

    Jason Guest

    I have a doctor's office and I ran audio to all the room by having one
    speaker in every room, connected to the amplifier via a simple
    Parallel circuit. However, I had two new rooms built and the speakers
    i bought for the new ones are higher powered (??) and require more
    electricity (?) and are much lower in volume than the rest of the
    speakers throughout my office. Is there a way I can raise the amount
    of power that these new speakers receive so that the volume will be
    somewhat equal to the other speakers? I imagine there must be a
    simple component that forces more electricity to go through a part of
    a parallel circuit. If you can, please write me at my email address:


    Or you can post it to this group and I will try to check every day.
    Thanks in advance.
     
  2. The problem with just connecting a bunch of speakers in parallel
    (besides the loudness adjustments you mention) is that the amplifier
    sees way to low a load impedance, compared to what it was designed to
    handle. It will overheat. The solution to this problem has been to
    add a small transformer to each speaker to raise its impedance high
    enough that many units in parallel do not draw so much current, and to
    adjust the amount of transformation to set the power to each speaker
    as desired. The two common forms of this transformer are ones
    designed to operate with up to 25 volts AC on their inputs, ones
    designed to operate with up to 70 volts and ones designed to operate
    on amplifier voltages up to 100 volts. At your power levels, probably
    any would work but I am guessing that your amplifier does not put out
    much more than 25 volts RMS. They can be mounted at the amplifier,
    but it is more efficient (from a wiring loss standpoint) to mount each
    near its speaker. This also makes selecting the appropriate tap to
    set the volume more convenient. You can also add a selector switch
    for the taps and mount that on the outside of the speaker enclosure
    (including a no tap selection to turn the speaker off) as a local
    volume control.

    For example:
    http://www.edcorusa.com/transformers/audio/audio_speaker.htm
    http://www.samsontech.com/products/relatedDocs/ds70_spec.pdf
    http://www.hammondmfg.com/117.htm
    http://www.rane.com/pdf/note136.pdf
    http://www.proacousticsusa.com/products.php?cId=37
     
  3. JeffM

    JeffM Guest

  4. Dan Fraser

    Dan Fraser Guest

    The new speakers are less efficient. I'm sorry but you need professional
    help. Call someone who knows what they are doing and pay them the $250.00 or
    so it will take to do it correctly with transformers on every speaker.

    The way you have it wires now will eventually destroy your amplifier.
     
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