So based upon the reading I've been doing, I went with the recommended Pioneer 8" sub with Kenwood amp in my 802A B&O system. I used an AudioControl LC2i line converter to get the signal from the existing amp, convert to RCA inputs, then to new amp to power the Pioneer sub. I hooked it all up as other members have and there is lots of distortion and sounds completely terrible. I've rewired the whole system multiple times (changed dual voice coil series/parallel, changed speaker wire inputs, checked positive/negative amp connections, different line converter...) and still coming up empty. While the speaker is out of the enclosure, there is no distortion but as soon as it's in the box, the distortion comes back even at low levels. So, my question is if people had to modify the existing box (other than moving plastic to fit speaker)? Did other people drill ports? Why is speaker distorting when mounted?