Serge Auckland wrote:

"Chris J Dixon" wrote

My amplifier has two outputs. One is switched, and used for the
speakers in the living room. The other is taken via a separate
switch box to speakers in the dining room and kitchen.

Originally, the relative sound levels in all three rooms were
reasonably matched. However, during a kitchen refit, I had to
get rid of the conventional speakers, and fitted a pair of small
KEF in-ceiling units. These have a rather lower output level. If
I deselect the dining room pair, the kitchen is well enough
matched to the living room.

As a least cost work-around, it strikes me that I might be able
to improve the situation by inserting series resistors in the
feed to the dining room. Would this work? Living in a semi, I
don't run at particularly high sound levels.

If the dining room application is for background music during meals, then it
should work fine by attenuating the 'speakers relative to the others. Unless
you know how many dBs you need to attenuate, and can then calculate the
series resistance value,

It is hard to say exactly, my ear isn't calibrated ;-)

I reckon that if I picked a figure out of thin air, then bought
two resistors for each speaker totaling that figure, ( say 1R &
2R2) by experimenting with using them singly or series/ parallel,
I would get quite a range.

If I wanted, for example, 3 dB attenuation, what resistor would
you calculate?

Chris
--
Chris J Dixon Nottingham UK


Have dancing shoes, will ceilidh.