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<blockquote data-quote="CarAudioAddict" data-source="post: 107972" data-attributes="member: 545743">get the four channel and use it to power the sub and your front speakers. use your existing amp to power the rear fill.&nbsp;As Gauntlet said, a good battery helps, but on the whole is not needed. Unless you listen to your system with the engine off, a battery upgrade will do nothing.An alt upgrade would be more worthwhile. use the following formula to determine if you need an Alt upgrade.Pre 1990 vehicle:35Amps (for cars electrical system) + total stereo requirements + 10Amps (to charge battery)If the total is more than your current Alt puts out then you need an upgradePost 1990 Vehicle:65Amps (for cars electrical system) + total stereo requirements + 10Amps (to charge battery)If the total is more than your current Alt puts out then you need an upgrade</blockquote>

[QUOTE="CarAudioAddict, post: 107972, member: 545743"] get the four channel and use it to power the sub and your front speakers. use your existing amp to power the rear fill. As Gauntlet said, a good battery helps, but on the whole is not needed. Unless you listen to your system with the engine off, a battery upgrade will do nothing. An alt upgrade would be more worthwhile. use the following formula to determine if you need an Alt upgrade. Pre 1990 vehicle: 35Amps (for cars electrical system) + total stereo requirements + 10Amps (to charge battery) If the total is more than your current Alt puts out then you need an upgrade Post 1990 Vehicle: 65Amps (for cars electrical system) + total stereo requirements + 10Amps (to charge battery) If the total is more than your current Alt puts out then you need an upgrade [/QUOTE]

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