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.
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Try removing the wires to the subwoofer and then hook a "aa" battery to it and see if it makes a pop sound..this will tell you if speker is ok...if it is then I think the amplifier sectionj for the sub is what is blowing the fuses...you are probably right..it looks like it's a 1 A fuse...but if it's blowing right away..it may be circuitry related
If you have replaced with the correct rating and the fuse blows off then you will need to check for higher current drain in the sub woofer or the network. After replacing the fuse load up the subwoofer slowly, reduce the bass and as you increase check at the point the fuse blows off. Now we need to analyse if the rating of the amplifier you are using is rated for the subwoofer. If your subwoofer has a higher rating you can increase the rating by about 25% and check again. Some amplifiers give a very higher voltage on full bass which could result in such a condition. Moderate this and check again. If the fuse stays Ok you can continue with this new rating.Otherwise the output of the amp at higher volume needs a confirmation. Hope this helps. Good day
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.
More than likely the power supply switching transistors have fried. Also check the large caps in the primary side of the power supply. If you don't know what your are doing do not attempt to fix the power supply.. very dangerous voltages involved !!! Send it to Klipsch for repair or purchase a Bash replacement panel http://www.parts-express.com/pe/showdetl.cfm?Partnumber=300-750