RE: [misterhouse-users] RE: PA speakers

[AO I. Inc. <mi...@ao...>]

Here is the setup I now have in place:

Computer speaker out sent to an old stereo receiver.  Speaker out from the
receiver sent to a Sima Speaker Selector (model SSW-6, $34 on U-Bid) which
will send the sound to a set of 6 stereo speakers without worrying about
impedance.  From the Sima, each speaker line is run to an input on RCS
Multi-Channel X-10 Relay Controller(Model 16CUX10, $148.85 from
Worthington). and then on to the CS5S Audiosource stereo speakers ($38/pair
from uBid.com) set up through out the house.  Each speaker now has an X-10
code for on and off.

This setup could give me 12 speakers spread throughout the house with 4
relays left to do other things.  Right now, some rooms have a single
speaker, while others have 2 for full stereo sound.

Mickey
  -----Original Message-----
  From: mis...@li...
[mailto:mis...@li...]On Behalf Of Jeff H
  Sent: Wednesday, January 30, 2002 8:41 PM
  To: mis...@li...
  Subject: [misterhouse-users] RE: PA speakers


  I used a 20 watt 8 ohm resistor with a DPDT relay. When the relay releases
the speaker connection, it connects the resistor in the circuit. Now, I'm
only using 4 speakers off my stereo for MisterHouse. If you have several
speakers, it should probably be done a little differently but this worked
fine for my setup. My only snafu was that I had it working and was
experimenting with how to drive the relays with my Basic Stamp in different
ways and blew my stamp (ouch!). Oh well, guess it's time to check out one of
the weeder DIO modules ;-).

  Jeff


  >I am wonder if those of you that are using Misterhouse to turn on and =
  >off different speaker zones are doing anything about the changing =
  >impedance seen by the amplifier.  Or has it not been a problem?   I am =
  >of course assuming that each speaker is being hook to the output of the =
  >amplifier in parallel by the relays.    When I have look at commercial =
  >multiroom audio system they seem to be using some sort of resistor =
  >network to isolate the amplifier from seeing changing impedance and also
=
  >keeps it from seeing too low of impedance from too many speaker in =
  >parallel.   Has anyone seen any DIY plans for something like this.