I have a barn built in the 1880's that I am turning the hay loft into a entertainment space. The loft is 40' x 60, with a 28' peak at the ceiling. I am doing this on a budget, pool table, ping pong, air hockey, whatever I find on Facebook Marketplace or Craigslist for cheap. Looking to add some speakers. \n\nI currently have a Rotel RB1050 amp with a bluetooth antennae connected to a par of pioneer speaker boxes. I have a lead on some 3\/4" MDS board for cheap, and want to build ten speaker boxes. I am thinking a 15" sub, 6x9" and 3" speaker per box. The Rotel amp has two channels, by the time I hook up 15 speakers in parallel, even with 8 ohms, I will be at 0.53 ohm impedance per channel. The manual recommends 4 ohm. Do I just make sure I don't turn the volume up too high? If I need more amp it will have to wait until I get some more cash. Can I build the speaker boxes now and upgrade the amp later?\n\nI am not looking to host concerts on this sound system, just provide a place for Boy Scouts to camp and throw a few big @$$ barbeques.