So I now have 4 pairs of speakers in my stereo/music system (still not a fan of 5.1 music), really needing a switch box so I can do a better job of comparing.

Most of the commonly available speaker selectors seem to include "impedence control", along with an associated power limit and apparent loss of volume. This seems something like I don't want, but I don't know enough to make an intelligent decision. So...

1. What is this "impedence control" ? Transformer, resistors, something else ?

2. What is the purpose/function of this impedence control - is it just to stop someone from connecting 4 or 8 speakers in parallel and complaining when their amps don't like the resulting 1-2 ohm impedence, or is it something more nuanced intended to prevent momentary opens or transient parallels from damaging the amp ?

I'm going to be connecting 1 pair of speakers at a time, wondering if I need to look for "good impedence control" or avoid it like the plague.

Thanks !

Hi John,

The best way to do this is with four channels of amplification and doing the switching at line level. It makes for easy level matching by having volume controls on the switcher.

We built a high level switcher to be able to A/B different components on the crossover. This takes a lot of big relays and needs to also switch a volume control for each the A and B back at the line level input. I am thinking the four channels of amplification is the easiest.

Thanks Ian.

Looks like I'm going to need a stronger coffee table