Tach together, At some bass frequencies my bass box overruns quite violently, i.e. the membrane from the sub jumps out to the stop and that sounds quite unhealthy, although I have hardly turned up the final stage (bassboost at 3/4 and level at just over 1/4). However, at most low frequencies the sub brings intense pressure without oversteering. Actually I would have to be able to turn up the final stage still much higher or? Can it be that the final stage too is weak for the sub, or that my battery provides too little power? (That’s when the engine is running and when it’s off) Power: Carpower Wanted 2/300 with 530Watt RMS (60A) Subwoofer: Emphaser EBR112XT with 700Watt RMS Battery: 45Ah with 295A Lima: 70A (Golf 3) I also have a 4-channel amp for front and rear boxes that pulls 30A but runs perfectly. Would be happy if someone could help me further.