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Need a PA But I Don't know @#$*&% About Them

While submixing can work it is less than ideal. You would be way better off with one mixer with enough inputs imo.

Can you explain why it's less than ideal? It's a tad more complicated with extra gain stages to optimize, but with modern preamps and intelligent use of the knobs (required for ANY of this stuff to work) signal to noise issues shouldn't crop up in a live situation. ...or is there another objection?

Personally though, I agree with Longfinger's last comment: if Rick's playing in the corner of a 10-table restaurant, vox only should be all he needs. Hell, the horns are going to be a volume issue without ANY mics on them :), and 3 open vox mics will pick up plenty of ambient noise if they're not gated.
 
Can you explain why it's less than ideal? It's a tad more complicated with extra gain stages to optimize, but with modern preamps and intelligent use of the knobs (required for ANY of this stuff to work) signal to noise issues shouldn't crop up in a live situation. ...or is there another objection?

Personally though, I agree with Longfinger's last comment: if Rick's playing in the corner of a 10-table restaurant, vox only should be all he needs. Hell, the horns are going to be a volume issue without ANY mics on them :), and 3 open vox mics will pick up plenty of ambient noise if they're not gated.

That's an understatement and frequently problematic depending on the intensity of your stage volume.

Riis
 
Rick as a professional sound designer I would come up with a budget first and see what equipment meets your needs. Professional sound isn't cheap by any means. I am a fan of yamaha products, they are inexpensive and are great quality. I would stay away from mackie products, far far away. As far as sub-mixing? it doesn't really have any advantages. Most professional and larger shows have a separate monitor mix but if you give yourself an adequate number of inputs and outputs on a mixer you have many routing options(for monitors and such). Quality speakers are also important. If you read the specs the speaker should give you the dispersion and that should give you an idea of how well it will perform in the given spaces. It can also help you figure out coverage and possibly phase problems (comb filtering). Check out meyersound they have some great information on their site and meyer makes great products. I know meyer isn't cheap but free information is always a great thing. I prefer powered speakers but many passive boxes are great. If you have questions or if I can assist let me know.