[mythtv-users] OT: Audio components

Joseph Fry joe at thefrys.com
Thu Apr 1 19:28:58 UTC 2010

This is definitely NOT the right place for this discussion.  I will respond,
but please let this thread end with this response.

You are so over thinking this.

http://sound.muzak.com/assets/pdf/how_to_design.pdf describes how to
calculate the wattage needed for your amp.  You are using commercial sound
system speakers correct?

Now you need a cheap 70V multizone amp like this one:
probably get a great deal on a used one on ebay or craigslist if your

Finally, use your software to output a Mono signal from your laptop, or let
your amp down mix for you if it has stereo inputs (like the one above).

Commercial systems are nothing like a typical home setup, and should not be
treated as such.  For example, if you use standard 8ohm speakers and run 3
of them together in parallel off your amp, you will present your amp with a
2ohm load, effectively drawing 4 times the current from the Amp... and
likely blowing a fuse.  Commercial speakers are very different and much more
suitable to this application.

On Wed, Mar 31, 2010 at 6:27 PM, Josh White <jaw1959 at gmail.com> wrote:

> Sorry if this is a bit off topic, but this seems like a good place to ask a
> general A/V question, and the answer to my question could be relevant to
> Myth users:
> I'm trying to design an audio system for a restaurant, and they want 3
> zones of mono sound.  I'm looking for something that I could input stereo
> audio, and output 3 mono signals that combines the stereo input from a
> netbook running iTunes.  I'm planning to use 3 "V-12M Muting Wall Mount
> Volume Control" units from (
> http://www.ecost.com/detail.aspx?edp=37244640&source=ecostdeal&cm_mmc=CSE-_-Shopping.com-_-ecostdeal-_-Electronics)
> to independently adjust the volume in the three zones (back room, front
> room, outside).  My plan is to find a home theater 5.1 surround system that
> I can set to output a mono signal to at least 3 of the channels, and then
> run them through the independent volume control units.  This is just
> background music, so absolute quality isn't a requirement, as long as it
> provides a reasonably clean signal (I'm not looking for insane audiophile
> level quality, something equivalent to the audio played from a TV for
> example, just no obvious noise that would be noticed in a loud dining
> room).
> Is my approach reasonable?  Any obvious holes in my plan?  Is there any
> magic product I can find that would do this all from one unit for a
> reasonable price (a price comparable to a low end 5.1 surround sound
> receiver)?
> Any advice would be appreciated.
> Thanks,
> Josh
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