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I think I have figured it out, but could definitely use some advice of more seasoned audiophiles.

We purchased a total of 10 ceiling speakers.

We purchased an amp that does various watts output depending on what impedance the speakers are wired as.

I want to wire 5 speakers to left channel and 5 speakers to the right channel.

We can just figure out how to wire one channel (we'll say left for this exercise, since the right will be identical)

The speakers are 4 ohm.

If I start with 2 of these speakers and wire them in series, I get 8 ohm.

If I repeat that again with another 2 speakers, I get another 8 ohm.

If I then wire those two pairs of speakers in parallel with the 5th speaker it would be 8 ohm / 8 ohm / 4 ohm. This according to an ohm calculator I found online will be a total of 2 ohms impedance on the system.

The amp at 2 ohms puts out 800 watts / channel.

From what I read about calculating wattage per speaker in a parallel system is it's total wattage divided by number of speakers. (i'm not sure if this stays true in a mixed series / parallel system)

If I've done that math right, and if I've read right, the final calculation is 800 watts divided by how many speakers. 800/5 = 160 watts per speaker.

Each speaker is 125 watts.

thanks guys.