I would avoid ports in a space with dust. weatherproof outdoor speakers might be the best choice.
7' ceiling is low. Hung ceiling? You might consider 4 or 6 ceiling mounted speakers, it's about content, not imaging. Think long, you can start with 2 and add later. Think about wall mounted volume control for each pair.
Dispersion is primarily about the tweeters, as high frequencies are narrow. If your preamp has vintage features, i.e. tone controls, options for 2 pairs of speakers, mode switch to use mono.
You can build a box for your equipment to minimize dust in, get heat out, perhaps a hinged door front and back with a washable filter like forced air furnaces have.
7' ceiling is low. Hung ceiling? You might consider 4 or 6 ceiling mounted speakers, it's about content, not imaging. Think long, you can start with 2 and add later. Think about wall mounted volume control for each pair.
Dispersion is primarily about the tweeters, as high frequencies are narrow. If your preamp has vintage features, i.e. tone controls, options for 2 pairs of speakers, mode switch to use mono.
You can build a box for your equipment to minimize dust in, get heat out, perhaps a hinged door front and back with a washable filter like forced air furnaces have.