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I use a cheap spectrum analyzer program with a Technics home stereo mic plugged in, I just adjust for differences.
My BMW has a Soundstream Reference 405, EQL, pioneer kevlar 5.25 seps (I paid $39 shipped off EBAY) , factory rear mids only rear fill, and a Punch 15.
rjp
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In the movies only bad guys sleep in king size beds.
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