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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
You do not say if the fuse blows immediately upon powering up or while the amplifier is operating. If it blows immediately, I'd check the power and ground.
If it is blowing the fuse while operating, I'd try a 30A and see if it holds. At maximum output of 100 watts times 4, the amplifier needs about 31 amps of current at 12.8V. So driving it hard could certainly blow a 25A fuse.
the new radio install is causing this if the power was taped into the starter system. rec. removing wires then try to see if you can blow your starter fuse
This particular product has a lot of comments posted on it and I've answered a few of them now so I'm beginning to think you may want to look into weather or not the manufacturer has received any complaints or this is just a freak occurrence. Keep in mind not all commments are the same so this may just be nothing. Either way I can tell you this much, if fuses keep blowing quickly, over and over again-You have a direct short somewhere and will most likely be in need of professional assistance of some sort with the possiblilty of having to replace it. I'm sorry it's not an easier fix but it may not be too expensive.
-Dynami
Subwoofers draw a tremendous amount of power. With the amount of heat generated by amperage flow and the movement of the voice coil, you may have burned out the coil. Do a resistance check across the coil. Easy check? Temporarily attach another speaker to replace that one. Use LOW VOLUME and slowly work the vol up,and, if the fuse does not blow, it's the other speaker.
Repeated fuse blowing generally indicates a blown power supply, or blown output stages or both. One thing to do is be sure that you have replaced the fuse with the correct type. A T stamped into the metal of the fuse near the rating, indicates sloblo or Time Lag fuse. A fastblo fuse, may work once, or more times, but will never replace a sloblo fuse in this type if unit. Good Luck, hope this info helps, don't hesitate to hit me back here for more help :)
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