Hi i just got a 12'' JbL sub from a friend. the problem i have is that the middle little circle piece had ripped from the main part of the cone in a triangle shape. It is still there but just flaps around when it is being used. is there a way i can glue it or do i have to take it to a shop, what can i do?
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To "make a bobin"
1 - Get some 0.5mm stainless steel
2 - Cut two 19mm circles out of the 0.5mm steel
3 - Drill a 6mm hole in the center of each circle
4 - Solder (silver solder work the best) the 2 circles together with a 6mm round by 9mm tall cylinder in between the two 19mm circular pieces.
riverray1969 it would help if I knew the exact model number of that JBL sub you are referring to. With that info I can provide exact specs.
Basically, you need to build/modify an sub enclosure that is suited for the sub, the music you mainly play, and vehicle tuning. Generally, sealed enclosures will provide tighter bass response and get decently loud. Some would argue that it will give you greater sound quality. A ported enclosure will give you a louder more booming sound. That depends also on where the port is tuned (ex. 32 hz, 36 hz, etc ). You need to make sure that the enclosure meets the sub's airspace requirement as well. A customized well made enclosure is just as important as the sub you put in it.
I hope you have strong hands. Start by holding the inside end of the spring in one hand, then carefully wind the spring back into a circle tightly until you get to the other end. The finished diameter of the spring must be a little smaller than the area it goes back into. Put it back in, then replace the pulley like it was when you disassembled it.
Sounds like your sub is "clipping". Clipping is when your speaker is trying to pull more power than the power supply. (head unit, amp) If it sounds good at a low volume and choppy at high volume, supply it with more power. Bigger amp. If it sounds choppy all the time, push gently on the middle of the speaker. It should go back and forth smoothly. If it feels rough, you have blown the coil. Replacing the speaker is the fix for that.
hi, by ripped, do you mean that the ribbons have come off the hinges or are they torn? if they are torn, any small cracks or torn edges will not harm much. but if the ribbon is sliced to pieces, they have to be replaced, as you cannot work with torn ribbon. here is a link to the manual with which you can replace the ribbons.
The little rip on the foam surround can be repaired easily with some pure silcone from a harware store. Make sure it's pure silicone, because the silicone mixtures may deteriorate the foam prematurely. Also, all you're really doing is plugging the hole that the rip makes so that air doesn't leak out and further damage the surround and also affect your sub's performance. You'll need to apply a thin to moderate coat of silicone to the rip, and make sure that some gets into the rip. Do NOT use globs or big lumps. You should apply some silicone to your finger, and carefully apply it to the area. Try not to get too much on the inside/backside of the rip. If you'd rather just get a replacement sub, you should be able to find the raw driver on eBay or at a local MTX dealer.