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Message: <blockquote data-quote="AndrewHD" data-source="post: 8273468" data-attributes="member: 645142"><p>Hey guys I installed 2 Sundown SA 12's in my Impala a while ago and it is not as impressive as it should be.  Box is custom made by Buck 4.0 cu ft net at 31hz powered by a Rockford 2500.1 at 4 ohms.  I think it may be due to a low pre amp voltage on my Eclipse AVN 726e (5V preamp).  Does anyone know how to test pre amps and where would I put the black and red probes from the multimeter?  A picture or video would help so much.  I have heard that this unit needs to have the volume up to the max and sub setting maxed out to get 5 volts so I am skeptical at this point</p></blockquote><p></p>

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