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Question about multi-room speakers

I just bought a house with speakers installed in the ceiling of the living room, master bedroom, kitchen and patio. All of them have cables through the walls that come out at the built-in shelving. However when I went to hook the cables up to my 5.1 receiver, I noticed there were 4 cables for each speaker!!! I'm accustomed to two - a positive and negative. But these had a black, white, red and green. Any idea why there would be 4? And which two should I hook into my receiver speaker inputs?

Thanks!

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Well, you might have pull out a speaker and have a look.

In reply to: Question about multi-room speakers

At how the wires are hooked up.
If I were in your shoes that's what I would do. John

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speakers

In reply to: Question about multi-room speakers

They could be using a 4 conductor wire going to one pair of speakers. It's common to install one pair using one "run" of wire and splitting the wire to hook up black and red for one speaker, then continuing on the next speaker with the other 2 conductors. Or if you're sure that they are using 4 conductor wire for each speaker they could be in place to biwire or bi-amp which most in ceiling speakers are not set up for.

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