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-   -   Volume control at the speaker? (https://www.diybanter.com/electronics-repair/115784-re-volume-control-speaker.html)

Leonard Caillouet August 3rd 05 09:48 PM

Volume control at the speaker?
 

"Pooh Bear" wrote in message
...

wrote:

Simple answer. Purchase a speaker selector switch at any electronics
outlet. The selector switch takes one pair of amplifier outputs and
spilts out the output to 4 and up to 8 stereo pairs. (it takes care of
the impedance problems).


Pray - tell us - how does it do that - " it takes care of the impedance
problems " ?

I rather think it does no such thing.

Graham


What they do is introduce a fixed resistance into the load to keep the
impedance from dropping too low. It is a common misconception among
salespeople, reps, and consumers that they maintain a constant impedance.
There is a slight drop in output when the "protection" is introduced. The
bottom line is that these units can work quite well but they can also allow
impedances at the amplifier to go too low for some amps to reliably drive.

Leonard




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