hey guys just installed a system into my vr the sub is a fusion encounter 900W dual voice coil in a custom wall ported box, box being raughly 4cm thick. and the amp is a 4X100w rms response amp these subs handle over 700Wrm. atm im running the sub each coil @ 350W rms @ 4ohms. very loud system hopping to get about 130-140db ive got a problem that either when the volume is low the sub is still reacting and putting out bass and also when the music is playing and i swap from CD to FM radio its gives a huge bass signal out of the sub any1 help ?