I don't know how or if any of these cheap ones are, but I've used a few EQ back in my obnoxiously loud stereo days. They all run 12VDC so if you can put up with the size, they should do fine.
http://shop.ebay.com/i.html?_nkw=car....c0.m270.l1313
I would just check their THD levels, should be less than .5% or better for clean sound. Not sure about the amp, most...even smaller ones, are pretty big, but maybe that's something you can do fairly easily with some simple circuits.
Seems like there are a few amp circuits floating about, but I've never attempted one myself. Might be fun to try sometime though:
http://www.ecircuitcenter.com/Circui..._Amplifier.htm
There are also some kits like this floating around:
http://cgi.ebay.com/Kit-88-10W-10W-S...d#ht_649wt_905
Not sure how any good they are, but they look smaller in size.
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