Yea,I definitely know what "lows" are. My truck flexed enought to rip the roof open and tear both rear door jams about 4". Destroyed the circuit boards in both tail lights weekly,blew the whole center/tag area out of the rear hatch,cracked the gas tank seem open,broke the circuit board in my pioneer/nav unit...All in the first month. Nice way to "break in" a new truck. I will take the advice and tune lower this time. I know it is gonna sound different but is 35hz the # to shoot for w/ the enclosure? I understand that vehicle have different resonance/natural frequency levels. Like I said,this isnt a comp. rig,just a driver. :hairtrick: