20 Most Recent JBL GT150 Car Subwoofer Questions & Answers


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

JBL GT150 Car... | Answered on Sep 16, 2014


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

JBL GT150 Car... | Answered on Aug 09, 2013


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.

JBL GT150 Car... | Answered on Aug 20, 2011


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

JBL GT150 Car... | Answered on Mar 22, 2011


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...

JBL GT150 Car... | Answered on Jan 13, 2010


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.

JBL GT150 Car... | Answered on Oct 10, 2009


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

JBL GT150 Car... | Answered on Jan 06, 2009

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