On Mon, 20 Oct 2003 19:49:42 +0100, Dave Plowman
wrote:

You could use the outputs of the power amplifiers into a passive mixer
with suitable attenuators and then feed into an external amp. I suppose it
is possible to make a mixer running at LS level using transformers, but
I'd guess an expensive option.

Or you could tell the boss: "Sorry, it's not technically possible at a
reasonable cost" and spare your co-workers the horrible inevitability
of the announcement :-)

You could even turn of the Muzak off completely. Though that's
probably against the law now ;-(