RE: TTS and how to do it?

["Ian Lowe" <ian@xxxxxxx>]

Bingo. :)

And the switching can be done by relays under PC control...

as an aside, assuming a stereo amp and source, with two "sets" of
four
speakers, you could easily have a quiet side and normal side...

so, during the night, you could drop certain zones to quiet settings.. I
am
assuming it would always be the same zones, (bedrooms etc) so you could
work
it out quote nicely...

Ian.


-----Original Message-----
From: Hawes,Timothy Edward (GEG) [mailto:haweste@xxxxxxx]
Sent: 14 June 2002 12:19
To: 'ukha_d@xxxxxxx'
Subject: RE: [ukha_d] TTS and how to do it?


And "8ohm" is either a speaker, or a "power resistor"
depending on whether
the zone is switched in or out ??

Tim H.
(learning, slowly)


-----Original Message-----
From: Ian Lowe

As I understand it...

AMP+---(8OHM)---AMP-

is *EXACTLY* equivelant in impedance terms to:

AMP+-(--(8OHM)---(8OHM)--)-AMP-
     (--(8OHM)---(8OHM)--)

(as the serial speakers have an effective impedace of 16 ohms, but
adding
these pairs in parallel brings the effective impedance back down to 8
ohms)

the difference, of course, is that you have higher power losses through
the
four speaker matrix, but this is TTS: mega volume is not the order of
the
day anyway..

Ian.


-----Original Message-----
From: Frank Mc Alinden

Hi Ian
        I Agree simple is best but how
do you connect 8 speakers to 1 source
without loading the amp?
Frank Mc








----- Original Message -----
From: "Kenneth Watt" <kennwatt@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, June 14, 2002 8:48 PM
Subject: RE: [ukha_d] TTS and how to do it?


> I like the way you're thinking Ian, simple is best and less likely
to
> fail!
>
> K.
>
> >
> > Perhaps it's a design philosophy, but I really prefer the
"dumb node"
> > approach wherever possible.
> >
> > Why have an amp + power + mute intelligence in each zone, when
you can
> > have
> > just a speaker, and a single wire run to it?
> >
> > I think the idea of using somehting like Ian B's irrigation
relay
> board to
> > switch on/off the zones seems like the best (for me anyway!)
> >
> > perhaps you could use connect the relays such that when closed,
the
> zone
> > speaker is in circuit, wheras if it's open, an 4 or 8 ohm
power
> resistor
> > is
> > in circuit instead?
> >
> > Ian.
>
>
>
>
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>

+


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