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Thread: 70 Volt Speakers

  1. #1

    70 Volt Speakers

    Are 70 V speakers supposed to be in conduit?

  2. #2
    Join Date
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    Massachusetts
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    Quote Originally Posted by brennan
    Are 70 V speakers supposed to be in conduit?
    Not if the amplifiers output is labeled 'Class 2' as most but not all are.

  3. #3
    Join Date
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    Quote Originally Posted by brennan
    Are 70 V speakers supposed to be in conduit?
    The largest electrical conduit I know of is 6", far too small to fit most of the 70 volt speakers I;ve seen. :smile:

    (sorry, couldn't resist)
    At my age, I'm accustomed to restaurants asking me to pay in advance, but now my bank has started sending me their calendar one month at a time.

  4. #4
    Join Date
    Aug 2007
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    plus even if you could put them in there, who's gonna hear it ? (other than your helper on the other end)

  5. #5
    Join Date
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    It all depends on the local inspector.

    We do a lot of 70v systems and the speakers we use are from Bogen. Bogen sells both backed and non-backed speakers.

    The speaker with the backing (box) produce much better sound and we use them in restaurants. The non-backed speakers are used for hospitals and those installs that do not require great sound reproduction and are used primarily as background music.

    Some municipalities require that the speaker be boxed using sheetrock above the ceiling.

  6. #6
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    Quote Originally Posted by ClearCom
    It all depends on the local inspector.
    It should not, the NEC is clear, class 2 and 5 circuits do not required raceways.

    Some municipalities require that the speaker be boxed using sheetrock above the ceiling.
    That would be a fire code. :smile:

  7. #7
    Join Date
    Aug 2007
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    Branchburg, NJ
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    I understand that he NEC is clear, but many an inspector are not.
    We do what the NEC dictates, but some inspectors need to be shown where in the book its listed.

    We have dealt with two inspectors in the same town that have different ideas on what to do.

    They basically look to make sure nothing is on the grid and they leave.
    We do have a good reputation for not cutting corners, so that might be why they leave us alone.
    We use the right wire, hang it correctly, secure where it needs to be, and make sure nothing is touching the grid or the supports.

  8. #8
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    I'm contemplating using the Bogen speakers that are already 2 feet square with built-in back box, rather than the regular seperate speaker, grille, tile bridge, and back box when I have the choice. The one's that are already 2 feet square have a dial you turn on the topside to select the max wattage of the speaker. No trying to decypher 10 different wire colors above a dark ceiling. The upcharge for the lay-in speaker is enough to offset the labor savings, the way I figure.


  9. #9
    Join Date
    Aug 2007
    Location
    Branchburg, NJ
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    They also have a version with a built in volume control for those area that need more tailoring.

    They are great drop in units that weigh less than 3 pounds.

    No more drilling holes in speaker tile and the need to use a back brace.

    The inspectors like them also.

  10. #10
    Well actually it was for a fire alarm system.

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