JBL GT150 Car Subwoofer - Answered Questions & Fixed issues

if you have real old wires from the amp to the sub try getting new wires on it. check the little wires that go to the cone itself on the sub. sometimes they can manage to get pulled out of their terminals and make sure that thier touching the terminals on the correct spot

well does the amp power up when you turn your key on and when you turn the radio on? if so check your RCA cables they might not be carrieing a signal. if the amp is not powering check your main inline fuse to see if its blown, also make sure to clean your ground wire connections as well. a dirty ground will cause your amp to not turn on also.

the regulator or the audio ic may be colapsed.replace them .

Sounds like you've blown them.

When you were playing back to the friend, were you playing louder than usual?

Was the old box ported, and the new one sealed? The lack of ventilation may have caused the blow...

bad connection. try hooking up a different test speaker to your amp. if it works you can trace the short into your sub. if not the terminals in your amp may need to be re-soldered.

It doesn't sound like the wiring from amp to sub is your problem.

Is your amp getting a power light ?
Are you sure your remote wire is hooked up properly ?
Check both ends of your RCA cables

has your amp been accidently swiched to stereo instead of mono,if so,swich it back.

Could be a bad ground i wish u lived around me I run my own audio installation business

It sounds like you have a disc stuck and it's overriding any commands. I would put the key to acc. Then I would unplug the cd changer from the back of changer and after a min or 2 plug it back in as you hold down on the eject button

Page 168 of the manual onwards.

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No user serviceable parts! If not working just replace!

YOU MAY HAVE TO GOING THE MENU AND CHECK THE REAR SEAT SETUP

Bad or shorted voice coil on sub maybe. If you have two subs try them one at a time to see if it goes into protect mode. Whatever sub does it is bad.

It is very dependent on your vehicle and whether you are using the built-in amp of the head unit or a separate amp. Ideally, I would recommend a good 6.5" component set.

Having them wired in series. Should only be a ground issue.

Lester, probably has a remote.

You need to calculate the amount of amps being driven through that fuse + the amount you need to feed the amplifier. In my Volvo S40 and V70 I had no problems driving an amplifier of the rear power connector, but on my Honda S2000 however I had to create a different connection all the way to the battery line for a smaller amp (connection as in cables, condensers/filters and fuses).

single channel about 1kW output power. About $250 when new. Specs here http://www.crutchfield.com/S-dVhyYWWFkBd/p_115GTO1201/JBL-Grand-Touring-Series-GTO1201-1-II.html

Use a C or D size battery. Get two pieces of wire. Strip each end. Wire one end of each to the sub. The other ends you will place one on the top of the battery and, one on the bottom of the battery. If the cone moves outward, you have the correct polarity. If the cone moves inward(toward the back of the speaker) then you have the polarity backwards