The Problem in this unit is the Amplifier module S64AMI,which is surrended in a black heatsink, filled with epoxy, not serviceable, the bad news is that JBL discontinued this module and is really hard to find, sorry....
The fuse is designed to protect the circuit and prevent fire. When a fuse blows it is because it is getting to much current through it. In some cases it could be because you replaced the fuse with one that did not meet the specs of the required fuse, there are different types of fuses and you should always replace with exactly the same type of fuse.
Do not replace with a higher Amp fuse, you could end up frying the amp at least. It's not a safe thing to do since there is an off chance of fire from using the wrong fuse.
If you have the right type of fuse installed and it is still blowing, then refer the unit to a qualified service center for repair, or look for a new replacement Amp.
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Go to Parts Express and buy the Bash 300w digital subwoofer amp.It fits almost exact except it is one inch shorter.Just use mdf to fill the space and this amp will outperform the original.I have done this and it's not really difficult,pretty straight forward. They usually sell for around $149,but they have sales often around $99.Good luck.
That model is known to have issues with the amps.Your problem is caused by a couple of components on the board shorting out.If you pull the amp out you will find on the large board behind the speaker terminal a couple of burned components.
The easiest fix is to buy a Bash 300w amp from Parts Express and replace the original amp.The Bash amp fits pretty well except that it is about an inch shorter.You can fill the hole with some mdf and have a sub that actually performs better than the original and with less heat build up as it is digital.Hope this helps,it's not complicated really.
Hi Im a Certified Repair technician, I seen few problems with this unit, there is a amplifier module inside this unit, is really hard to find since JBL discontinued this almost immediately.
Sorry no really worth to bother........
THE FILTERS /FILTRES ON YOUR SPEAKERS ARE TORN OR DAMAGED. IF YOU STILL HAVE WARRENTY ON THEY FROM JBL YOU CAN RETURN THEM FOR NEW ONES, PROVIDING THAT IS COVERED. IF NOT. I PERSONALLY RECOMMEND YOU BUY YOU SOME NEW ONES. REPAIRING WOULD BE OK, BUT IT WILL HAPPEN AGAIN VERY QUICKLY.
I found a post where someone replaced several capacitors with ones he described as titanium and a higher voltage like 100 v rating rather than 50 as oem. He states no more problems. I found this site while searching again.
I also found a free download pdf repair manual from JBL - site defined as Harmon, and they show revised parts replacements for these caps - 100 volt.
I just bought a used one and not hooked up as yet, but I plan to use slow blow fuses and possibly a little higher rating - not much though, and I believe there is a ceramic type - color solid white - that may withstand the apparant surge.
Theres also a recent post somewhere for sale of the amplifer board... 64smi or something like that.
Hope this helps.