Fw: Problems going from stereo to mono

[Gareth Cook <g@xxxxxxxxxx>]

As it's the Sonos system, I cant tell it to output mono.

Hence something electronic to manage the stereo to mono feed.

G.

Gareth Cook
SWG EMEA North Account Manager
IBM SWG - BTE Office - Lotus Park, Staines, TW18 3AG
Office: +44 (0)1784 445166 - Mobile: +44 (0)7980 445166
AIM Chat : TheBoyG - MSN Chat : chat@xxxxxxx
email: g@xxxxxxx


----- Forwarded by Gareth Cook/UK/IBM on 18/03/2005 08:33 -----

Discussion
Main Topic

Jim Noble <yahoo-groups@xxxxxxx>
Yesterday 16:12

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Subject:
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Re: [ukha_d] Problems going from stereo to mono
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Category:




Gareth Cook wrote:

> Thing is, the dining room works fine - but the kitchen and games room
> only
> have one channel coming out of them (easily tested by shifting the
output
> balance to left or right).
> So, assuming the amp inside doesnt like me doing this - is there a
simple
> addon i could use to correctly merge left and right into one channel ?


...and rightly so.

Imagine you're listening to some slightly unusual, minimalist music. Out
of the left channel you have a nice pure sinewave, and out of the right
channel you have the same sinewave but 180 degrees out of phase (such
that when the voltage on one channel is high, the other channel is low,
and vice versa)...

<waits for penny to drop> :-)

Presumably one channel is seeing the short and is shutting down (and
thus going high impedance). The other channel is then free to wobbly the
speaker as intended. I'd suggest disconnecting at the earliest
opportunity though, because if there's no short circuit protection you
might blow/have blown the amplifier in one of the channels.

You need to feed it a mono signal on the input side (possible on both
left and right channels) and then connect each speaker to only one
output. Maplin do line level mixers IIRC, or you could cobble something
together with a few resistors (or if you're lucky, mono input is
supported by the amps?).

Jim