my sponsor db it for me at his shop but I'm not sure the mic used but i did make 146 with 1 15" in a 5.5 cubic foot box on 1 diamond d6 amp in a 03 Malibu back seats down and mic at front seat passenger side driver side made 144db my sponsor thinks its b/c the port is off center
this GP i got is going to get 2 of the 15's that were in the Malibu and 2 of the diamond d6 amps or maybe 1 8000watt max 4000watt rms mojo amp (Memphis audio)