Don't get too obsessed with matching speaker and amplifier watts. Unless your speakers sound crappy at low volume, "underdriving" them just means they're not getting as loud as possible. Bass/sub drivers are, as a rule-of-thumb, more forgiving of high-power transients than tweeter and mid-ranges, so if your amp has twice the power your subs are rated for, it shouldn't be a problem unless you keep it cranked all the way up. Just make sure you don't over-stress the surrounds or bottom out the coil.
Also keep in mind that you will never get true, audiophile-grade, high-fidelity sound in a car, especially one as small as a 370Z. But it doesn't really matter since everybody's perception of sound is different. Make it sound they way you like.
Edit:
BTW, in an audio system, the transducers will have a much greater effect on fidelity than the amplifiers. Most modern amps do a very good job, so, unless you're using a microphone or other physical input, spend most of your effort and money on speakers. The right enclosure makes a big difference the lower the frequency the speaker puts out, so choose your sub enclosure carefully.
Last edited by SouthArk370Z; 12-13-2012 at 02:33 PM.
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