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ceiling speaker system wiring

Discussion in 'Electronic Basics' started by chuck clark, Jun 24, 2004.

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  1. chuck clark

    chuck clark Guest

    Hi,
    I am installing a ceiling speaker system in a friends office. I have
    an amp
    and 7 speakers and plenum rated wiring. I am trying to figure out
    exactly how
    to wire this. I have some pictures here of the equipment.

    http://www.largeprojections.com/speakers/

    The 7 speakers will reside in 6 separate areas, each in a separate
    room, except for 2 speakers in a larger room.

    I have been reading this article
    http://www.partsexpress.com/resources/70volt.html

    I believe I can just connect all the speakers in parallel. Is this correct?

    Also, I believe I should use the 70w tap off the amp, but where do
    I connect the other wire? I don't understand these amp obviously.

    Any help is appreciated,
    Chuck
     
  2. Randy Day

    Randy Day Guest

    Try getting two more speakers; put 3
    each in a series string, then wire the
    strings in parallel.

    AMP-----+-----+----+
    | | |
    S S S
    | | |
    S S S
    | | |
    S S S
    | | |
    AMP-----+-----+----+



    Keep in mind - no matter how you wire
    them, each speaker will get (at best)
    1/7th to 1/9th of the total power
    output of the amp.

    [snip]
    Only if you want to let the magic smoke
    out of your amp!

    In other words: no, that is not correct.
     
  3. chuck clark

    chuck clark Guest

    Try getting two more speakers; put 3
    Hi,
    I just want to be totally clear, Is this setup true if each speaker
    has a transformer?

    Thanks,
    chuck
     
  4. Rich Grise

    Rich Grise Guest

    No, it's not. You connect the transformer primaries in parallel,
    as in the second diagram, between para. 6 and 7.10.1.
    http://www.partsexpress.com/resources/70volt.html

    Good Luck!
    Rich
     
  5. JeffM

    JeffM Guest

    I have an amp and 7 speakers
    Ignore Randy and, as Grise says, follow Fig 7-16 exactly.
    The transformer primary of each speaker
    gets 1 wire from COM (common--makes sense now, yes?)
    and 1 wire from the 70 volt output.
    Yes, these will be parallel connections.

    In this application, it won't make any difference
    (well, maybe the room with 2 speakers)
    but standard practice is to put the same (hot) wire on the same point
    (same terminal number) on each speaker.
    The same goes for the common wire.
    e.g. white wire on Term1, black wire on Term4.
    This is called "phasing".

    You got good equipment, collected good information, and posted here well.
    Atta-boy. Now just finish the job.
     
  6. Randy Day

    Randy Day Guest

    ???

    Where in the original message did the
    original poster say he had a bunch of
    impedance-matching transformers handy?

    I agree 7-16 is the way to go, but the
    OP sounded like he wanted to just lash
    together a bunch of speakers!
     
  7. chuck clark

    chuck clark Guest

    Hi,
    I didn't put any specs of the equipment because it was clearly
    visable in the
    picutures.

    Many thanks for everyone's help. I have it all working now!

    Chuck
     
  8. Rich Grise

    Rich Grise Guest

    Chuck, were you the OP? I remember, in the post that I
    responded to, that you'd asked, "Do I connect the speaker
    terminals, or the transformer terminals?" or something of
    the sort. I was kinda able to figure out that each speaker
    had come with its own 70 Volt transformer.

    Cheers!
    Rich
     
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