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<blockquote data-quote="lashlee" data-source="post: 3729326" data-attributes="member: 545803">First, some BMW&#039;s have the battery in the trunk, so running the ground to the battery may not make that much difference, and second, if it is in the trunk, 8 awg wire will be fine. Both amps are only 200-250 watts, so their is no need of larger power wire.Take a DMM, and set it read resistance, usually labeled with an omega, the symbol for ohms. Touch each lead to the terminal cup on the box, red to red, black to black and see what the measurement is. Depending on the ratings of the coil(s), it may be wired wrong. If his amp plays louder, then I would say that the gain on the alpine is set lower. Both amps are mono amps, and should be making the same amount of power. The H/U setting shouldn&#039;t matter, especially when you consider that one amp is louder, with the same H/U settings.If you don&#039;t have a DMM, pull the sub out of the box and take notes of how it is wired, and what the model number of the sub.</blockquote>

[QUOTE="lashlee, post: 3729326, member: 545803"] First, some BMW's have the battery in the trunk, so running the ground to the battery may not make that much difference, and second, if it is in the trunk, 8 awg wire will be fine. Both amps are only 200-250 watts, so their is no need of larger power wire. Take a DMM, and set it read resistance, usually labeled with an omega, the symbol for ohms. Touch each lead to the terminal cup on the box, red to red, black to black and see what the measurement is. Depending on the ratings of the coil(s), it may be wired wrong. If his amp plays louder, then I would say that the gain on the alpine is set lower. Both amps are mono amps, and should be making the same amount of power. The H/U setting shouldn't matter, especially when you consider that one amp is louder, with the same H/U settings. If you don't have a DMM, pull the sub out of the box and take notes of how it is wired, and what the model number of the sub. [/QUOTE]

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