RE: Problems going from stereo to mono

["Paul Gale" <groups@xxxxxxxxxxxxxxxx>]

All my mono speakers (summing speakers) have stereo terminals - there's
something in the speaker that deals with the stereo to mono mix - are you
sure yours don't have this?

Paul.



> -----Original Message-----
> From: Jim Noble [mailto:yahoo-groups@xxxxxxx]
> Sent: 17 March 2005 16:12
> To: ukha_d@xxxxxxx
> Subject: Re: [ukha_d] Problems going from stereo to mono
>
>
> 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
>
>
>
>
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