I'm helping a friend wire his retail store with five speakers in the ceiling. The ceiling is way up there, probably 30 feet high. We have access to some scaffolding this weekend, which will make the wiring job easier. The ceiling will remain exposed. These speakers will only be used for background music in the store. I'm wondering if it is ok to wire the speakers in series from the amp? Is there a gauge consideration if I do this? The speakers will be in line from the back of the store towards the front and I'd like to avoid having to run a separate pair of wires to each speaker. The second question is about mounting. There are electrical double gang J-boxes available on the ceiling. Are there any mounting kits made to allow us to mount the speakers to the J -box? We haven’t picked the speakers yet. I’m thinking of some type of outdoor speaker that will blend in with the HVAC and girders. Any suggestions? Thanks for the help.