Perhaps a foolish question, but .....

Mapman,

This because the CD is produced with the same content in both left and right channels, therefore you will get an image precisely centered between a pair of speakers. This is of course the same effect as a mono cartridge feeding the same signal into both the left and right channel of a stereo phono preamp.

Good Listening

Peter

Thanks Mofimadness .... seems like a simple solution.

Adam...you're welcome. Very easy and cheap to do.

Hah I used to use mono switch a lot when was listening to early Beatles stereo releases. Mono switch helped a lot to mask poor stereo mastering back then.