Cable sizing for Ceiling Speakers
Cable sizing for Ceiling Speakers
(OP)
Hi there,
We are having 6 W Bosch Ceiling Speakers in our Project. Where Route length from end to end is up to 1000 meters at some places. Please tell me what cable size shall be suitable for it. And how it can be calculated for a specified length.
We are having 6 W Bosch Ceiling Speakers in our Project. Where Route length from end to end is up to 1000 meters at some places. Please tell me what cable size shall be suitable for it. And how it can be calculated for a specified length.





RE: Cable sizing for Ceiling Speakers
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RE: Cable sizing for Ceiling Speakers
RE: Cable sizing for Ceiling Speakers
RE: Cable sizing for Ceiling Speakers
Here's a ref to get started: http://en.wikipedia.org/wiki/Constant-voltage_spea...
With such higher voltage audio distribution, the wire can be (much) smaller gauge than if you tried to use an 8-ohm speaker at the end of a very long cable.
RE: Cable sizing for Ceiling Speakers
RE: Cable sizing for Ceiling Speakers
The '70volt' type standard for speakers is just audio at a much higher voltage, with transformers. Same concept as your local power grid. Voltage drop goes as the inverse square of the voltage ratio.
It's the standard approach.
RE: Cable sizing for Ceiling Speakers
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RE: Cable sizing for Ceiling Speakers
You're right. The typical little '70v' audio transformers I've seen aren't intended to pass a lot of bass. I actually have one or two fairly hefty ones in my junkbox, intended for the source end.
I had assumed that this was for paging. Or 'Muzak'.
RE: Cable sizing for Ceiling Speakers
Keith Cress
kcress - http://www.flaminsystems.com
RE: Cable sizing for Ceiling Speakers
Dan - Owner
http://www.Hi-TecDesigns.com
RE: Cable sizing for Ceiling Speakers
RE: Cable sizing for Ceiling Speakers
RE: Cable sizing for Ceiling Speakers
... or are you intending to just hang them from the bar grate of the deck above?
Is there some kind of acoustic shelter surrounding the speaker locations, so people have a chance of hearing the speakers over the noise generated by the powerplant?
Do you have strobe lights near the speakers to let hearing-impaired people know that something important is going on, and they should turn on their hearing aids, or ask someone what's happening, or ... run?
... and to let normal people know that they should move closer to the speakers so they can maybe hear the speakers?
Mike Halloran
Pembroke Pines, FL, USA
RE: Cable sizing for Ceiling Speakers
RE: Cable sizing for Ceiling Speakers
Here's an application note from one of the better-known professional amplifier brands which might help you understand how this works: http://www.crownaudio.com/media/pdf/amps/138905-1_...