Hey,
With what i have in my car could i be considered a GP. I have an Eclipse AVN 5500 head-unit feeding signal to a Phoenix Gold Octane 15.0:1.The amp then feeds 1000 watts to a single Mtx 9500 15" 4ohm DVC subwoofer sittin in an Audio Enhancers slot port enclosure. Right now the sub and port are firing straight into the trunk lid because the enclosure is to tall. With that said i still do anywhere from a 138-141 at the headrest on the TL. Yea we measure at the headrest in the MECA circuit now no more under the dash.