Subject: From: Date:

RE: [ECS] Dedicated Speakers vs Local Phone Sessions Ingo Dean Fri, 28 Aug 1998 13:20:42 -0400

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Michael,

This sounds like what I want!

Do you use twisted-pair (shielded or unshielded?) or speaker cable
from the relays to the transformer/speaker combos?

Does using the transformers eliminate all impedence problems from
having a varying number of speakers online at any one time?  If I use
an old receiver instead of my soundblaster card directly, will this
still work?  Do I have to worry about power handling capability of the
transformers?

Where did you get the tranformers?  Is the "70.7V LINE MATCHING
TRANSFORMER" listed at http://www.parts-express.com the right thing to
use?

I know, lots of questions...  sorry.

--ingo dean


> I have 16 ceiling speakers throughout the house.  To drive
> those speakers, I
> take the output of my sound card into the primary of a
> 70volt speaker
> transformer.  The output of that transformer feeds the 16
> relays on one of
> my Redacs.  The output of those relays in turn feeds the
> secondaries  of 16
> different 70volt transformers.  The primaries of these 16
> transformers feed
> the speakers in each room.  Make sense?  I then use ECS to close
> one/some/all of the relays depending on how widespread the
> message to be
> spoken needs to be.
>
> The amp in the soundblaster card is plenty loud enough, in
> fact, I only have
> it up about 3/4 of the way.

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