Re: TTS and how to do it?

["Frank Mc Alinden" <armagh@xxxxxxx>]

Thats Correct Ian
I would assume the resistors would have to be the same wattage as
speakers.
I wonder what effect would have switching speakers in /out (the
transition
point ) have on the amp. Maybe mute output when momentarily when
selecting
/deselecting? zones .Ians relay board
does not have dry changeover contacts to switch between resistor and
speaker
although would be good to use to isolate from hv or pc.

Frank Mc
----- Original Message -----
From: "Ian Lowe" <ian@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Friday, June 14, 2002 9:15 PM
Subject: RE: [ukha_d] TTS and how to do it?


> 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 [mailto:armagh@xxxxxxx]
> Sent: 14 June 2002 11:58
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] TTS and how to do it?
>
>
> 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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