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If fuses blown there is a case to search for short circuited active parts examples are end-transistors caused by clipping speakers cable shorts leaking or convexed capacitors but any new fuse will blowing again and again also the bridge rectifier to make dc voltage inside the power supply of the subwoofer can caused this problem
It's no clear what you mean by "I had to change the STK", but if that means you have somehow defeated the fusing or place a larger fuse than it requires then STOP and shut it off. You might be risking a fire or more serious damage to the amp.
I would recommend you find a hands-on tech to look at it.
If you have resolved the fuse problem and now just have low subwoofer volume, you might want to track it back to the source and ITS subwoofer volume setting. There IS a volume level control on the sub, too. Turn it up.
It may be the power supply fuse. The fuse is a "2amp Type T or slo-blo 250v" if you live in north america. If your electrical current is 230v like in europe the fuse you need is "1.25amp Type T or sloblo 250v". You will need to unplug the unit from the wall outlet, unplug all cables, and set the unit on a padded surface. Remove the 10 screws holding the amplifier to the sub box and remove the amp assembly from the box. At the bottom of the circuit board is a glass fuse, gently remove that fuse and inspect it for obvious signs, like dark burn spots. If you can, check it for continuity, or just replace it. Also before going through this check the outlet that the sub is plugged into for power.
Some kind of semi-conductor in either the power supply section or the main amp has failed and acting like a piece of wire, which is why the fuse is blowing. You might want to look around for damage or burning. If it's a transistor or diode that has gone an Ohm Meter will show it up well. For when you put the test probes on the terminals of the suspect part, it will be like you had touched the probes together!
Somethings shorted inside. Could be the output IC or transistor, diod in power supply, power transformer. Somebody will have to open it up to find out.
It could be a cheap fix like a couple $4 transistors or it could be expensive, like a