Isn't the 310a a mono channel amp? I would say it's a good buy if you're looking for 2 amps to power some 6x9s in the rear (check to see if it's bridgeable, I don't think it is)...The RMS rating on those amps are somewhere around 100 I believe. You'll blow some quality 6x8s (Pioneers, Kenwoods) with that much power. Unless you're running very high quality 6x8s such as some Infinity Kappas, you'll blow em. zacharyzmn sells has a bunch of infinity and kicker stuff, PM to see what he's got. BTW: I would be leary of buying anything refurbished, unless you can get something like a 4 channel infinity amp pushing about 50 watts rms per channel.
I wouldnt power 2 pairs with a mono block. 1 channel per speaker, or 4 channel amp. That way you can tune each speaker, or each pair. with a mono block you tune all 4 at once, pretty much limiting everything
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