hello, I have here a cheap final stage (GIGABOYZ AMP-400). which went 1 week also quite well. when listening to music she suddenly went to PROTECT. took her off once and connected to 12V at home (without boxes). the performance mammal is over 10A and I hear a loud buzzing in the area of the spit. but it is nothing messed up. can you save this protect or is the final stage down? can I still do something myself? have a multimeter here. if someone gives me a tip Is the construction of end stages always the same or different? somehow the spule also seems a bit small (about as big as when you make a circle out of your finger and thumb). on the end stage stands 4-channel 800W. have added a picture… have measured front 2 speakers with 4 OHM, and my SUB mark blaubunkt has 3.3 OHM. have thus channel 1/2 for front and 3/4 for the sub. mfg docmaxhttp://home.arcor.de/docmax1978/pics/auto/D SCF0031.JPG