I've done lots of internet searches looking for information about how impedence-matching volume controls work. Never found a thing beyond the fact that some of these things use auto-transformers, and some are purely resistive (e.g. L-pads). The problem I have is when you have several rooms, each with its own volume control, and all this is wired in parallel to the amplifier outputs. The cheap solution seems to be to put a 4-ohm power resistor in series with the speakers to limit the load on the amp. The house I'm looking at has 18 speakers; each of them has a woofer and a tweeter and a crossover, which means that wiring some of them in series is out; so they are all in parallel, which is less than 1/2 ohm. The 4-ohm series resistor saves the amp but also dissipates something like 90% of the amps output power.
If somebody can point me to some places that I can read about how this stuff works, I'd greatly appreciate it.
thanks
If somebody can point me to some places that I can read about how this stuff works, I'd greatly appreciate it.
thanks