New answers tagged amplifiers
You can't just measure the DC resistance, that's not relevant at all. The easiest way to measure some impedance is to send a standard 50 / 60 Hz sine signal to the speaker (e.g. produced by dangling an unshielded wire from the amplifier input1 and turning up the volume), and then measure both AC voltage parallel to the speaker and AC current in series, ...
I found this "speaker switcher": http://www.amazon.com/4-ZONE-Speaker-Selector-Switcher-Control/dp/B003ED2DZA/ref=sr_1_6 It seems like it might be what I want.
Use a distribution amplifier and put a variable attenuator inline after each send. This will allow you to control the volume of each line level output. You might also be able to find a DA with built in level control. A DA is absolutely what you want for this case though. Note that you could also use a DA and send the same level feed to two different ...
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