I bought one of AcId'* boxes a while back, and installed my two Pioneer 12" subs in them with an Infinity amp running them. I was kind of disappointed, because it really didn't put out much volume. I mean, it was infintiely better than what I'd had before(stock), just a little less than expected.
Well, the other day I picked up some PVC pipe from Lowe'* and had to turn the box sideway to use the pass through. I turned it so the subs faced the side of the trunk, to keep them from getting hit by the pipe. Got in, took off and turned on the stereo at my usual volume.
Sudden audio overload, had to turn it down about 1/4. The rear view mirror was actually starting to droop as the vibration rattled it.(Tightened the set screw later)
I can't believe the sound now, I may actually have to turn down the gain on the amp itself, because if I pull the output from the radio down much more, it'll kill the sound quality.
I guess the volume of the trunk was too much for the box, and turning it towards the side cut it down to about a fifth of that volume. Kind of a loose bandpass effect, I guess.