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Message: <blockquote data-quote="maxmil982" data-source="post: 8692219" data-attributes="member: 669015">SA-12 will be ported in fairly large box ~1.75 cuft and tuned to 31 Hz. Most people who had similar boxes said it gets muddy above 55Hz, but I agree with you...just got to build it and test for myself. But just to be safe I'll just get some mids that get low. What do you think about the Polk MM 6502?It's an '05 Altima and yeah 2 amps running somewhere around 1700a total. I talked to 2 audio junkies, forum vets and they both said just just 0/1 wire, do Big 3, upgrade grounds to chassis etc...basically just beef up electrical wiring all around and no need for additional battery, upgrade battery, HO alternator, caps...none of that as long as the stereo wont be playing long with the engine not running. That was a shock. Most everyone I've talked too said either a battery or alternator was necessary...</blockquote>

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