Hello again:slayer: twin air 500 ,,,,found speakers vibrate badly in rear panels when I bought car fader on stereo was all to the front then found out why!! Sounds like a bee in a jar even at low volume so held panel in hard and it stopped hey presto,,so between seat and panel stuffed a small cushion between and it stopped and u can wak up meat loaf to max and is fine so guna take rear base seat (2 bolts)out and get sum thin foam and stick it around speaker so it dusnt foul the panel hope this may help other people if they have same prob,,,'Leon :worship: