Hello community, my problem I already got in the title but I will get out for a short time. So the subwoofer (JBL Stage 1200b Belief with 4 Ohm and 250w RMS) is in use for more than a year with a Magnat Pantera Two. In addition, a capacitor of Crunch is installed. In combination everything worked perfectly. Last time I accidentally let music run on battery and at some point the battery was empty. The car is no longer a I wanted to listen to music on my way to work in the morning, but then I realized that the bass was missing somehow. After the work, everything went on again. A few days later, nothing went on until the whole day and only after 20-45min the bass came back somehow. If the subwoofer doesn’t work, then the standard loudspeakers sound like o b they were completely deprived of the bass and as if the heights are very distorted. Well, yesterday I installed a new battery (maintenance-free) and the first test still didn’t work. Couple minutes later after starting again everything went and I thought the problem was solved. The battery is new, the radio goes on, the capacitor has enough voltage I think (between 12,3-14,5 [unit is missing]), the power stage shows however no functionality in the form of light the LEDs. The fuse from the power amplifier is not through and the main fuse proximity of the battery can not be through either, since the capacitor actually draws power from there. Does everything seem to work, just not stop from the beginning. So what could the problem be? If more information is needed for a remote diagnosis simply write as a comment! I hope on help! Best regards