great advice... that caused a lot of reading.. I think I may have it figured out.. will someone check my math - I keep getting confused in my own mind
I believe this will equal out the ohm load.
There are 10 speakers total with 3 runs to the source.
The first run from the source -
Speakers 1 and 2 are on a pole 75 feet from the source. Speakers 3 and 4 are on a pole 100 feet from speakers 1 and 2. Speaker 5 is on a pole 110 feet from speakers 3 and 4.
There is a 12ga wire from the source to the poll of speaker 1/2. There is a 12ga wire from the speaker 1/2 pole to the speaker 3/4 pole and there is a 12ga wire from the speaker 3/4 pole to speaker 5.
Connect the + of the source wire to the + of speaker 1. - of speaker 1 to the + on speaker 2. - on speaker 2 will get spliced into the - on the source wire. The + of the source wire will get spliced to the + of the wire that runs from the speaker 1/2 pole to speaker 3/4 pole. At the speaker 3/4 pole the + from the 1/2 pole wire will go the + on speaker 3. - on speaker 3 will go to + on speaker 4. - on speaker 4 will get spliced to the - that will run back to the - on the source wire at the first pole. For speaker #5, the + will get spliced to the source + from the 1/2 pole at the 3/4 pole. The - will get spliced in the the - that returns to the source.
Run 2 from the source
Speaker 6 is 60 feet from the source on a pole. Speaker 7 is 30 feet from speaker 6 on a pole.
There is a 12ga wire from the source to speaker 6, then a 12ga wire from speaker 6 to 7.
Source wire + to + on speaker 6. - on speaker 6 to + on speaker 7. - on speaker 7 to - on source wire
Run 3 from the source
Speaker 8 is on the wall 15 feet from source. Speaker 9 is 3 feet from speaker 8 and speaker 10 is 10 feet from speaker 9.
There is a 12ga wire from the source to speaker 8, then a 12ga wire from speaker 8 to 9 and then a 12ga wire from speaker 9 to 10.
Source wire + to + on speaker 8. - on 8 to + on 9. Splice source + to + on wire from 9 to 10. connect all - together back to source.
The source is a Crown XLS 1002 in bridge mode. There is a monoprice speaker selector there - not sure if it will be used again - may get a better one that can handle 12ga wire or I may pigtail a 14ga wire to the 12ga source wires and then run 14ga from the monoprice input to the crown output. Does the series / parallel hook up make any difference if the speaker selector is used? According to the specs it provides impedance matching.
For testing purposes I hooked up the source to speaker 1 (+/-) then (+/-) to speaker 2. Then took the wire to speaker 3/4 and hooked it up to speaker 2 (+/-) hooked that up to speaker 3 (+/-) then went from 3 to 4 (+/-). Sounded great but I have a feeling it wont last long term?
I appreciate all the advice so far! thanks!