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Message: <blockquote data-quote="Immacomputer" data-source="post: 2158892" data-attributes="member: 570419">Take a 9v battery and put the positive wire to the sub onto the positive terminal of the battery and then the negative wire to the negative terminal. The sub should move out when you do this. If it doesn't move (I'm pretty sure even an MT should move) then you may have them out of phase. After switching the polarity of one coil, try it again and see what happens. If it now moves out, you're good to go. If it moved out from the start, try setting your gain by ear instead of a dmm.The only time I use a dmm is when I have to get two amps to put out the same power. I will set the first amp up by ear and then measure it with a dmm then I use the dmm to set the second amp up using the same load.</blockquote>

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