New Subpanel?

Square D QO MLO load center. Breakers plug in.

Better, more money, Square D NQOD. Bolt on or plug in breakers. Bolt on breakers are better. Panel can be ordered with plated copper buss. Most of todays panels have aluminum buss.

Example of prices for the NQOD
http://ecatalog.squared.com/catalog/173/html/sections/08/17308006.html

HD sells the Square D QO panels and breakers. Do not buy the Square D Home Line brand.
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>What is the make-up of your Audio System?
>What size of wire are you planning on feeding the sub panel with?
>What is the distance the sub panel will be from the main panel?
>How far will the loads, receptacles, be from the sub panel?
>Will the sub panel be strictly 120V, or 120V/240V?
>Will the dedicated branch circuits be NM-B, (Romex trade name), or will they be installed in conduit?
>Are you planning on hiring an electrical contractor for the install?

IMO it isn't gonna matter, for a few extra bucks I'd use 12 gauge wire. I've read good things about upgrading your outlets, but then again, you can't always believe what you read.

If you're feeding it 220, make sure it has dual buses.