20 Most Recent JBL GT5A604E 4-way Car Amplifier Questions & Answers


Either sounds like your negative ground needs a to be in a better spot or your wiring and fuses need to be bigger.

JBL GT5A604E... | Answered on Jan 17, 2010


the amp probably has a x-over knob, a bass boost knob, and an eq knob. the eq is probably an internal crossover switch that will take the output from either high range (tweeters) or full range (6x9s) or low pass (subs) leave it on low pass. the bass boost however, will add distortion if turned up too high. its not noticable in the car, actually it sounds louder in the car but if you open the trunk and listen, you can tell its distorted bass and actually frying your speakers. the x-over knob is used to tune the frequency at which the amp stops pushing out bass tones. if you like rock music loud, turn it up higher, if you like low deep rap bass, turn it lower. keeping it too high might give you bad sound from either type though. ALSO THE GAIN OR LEVEL.IT IS NOT TO MAKE YOUR SUBS LOUDER IT WILL BLOW THEM .the gain is used to set your amp to your head unit which there is a procedure to do it.

JBL GT5A604E... | Answered on Jun 15, 2009


No user serviceable parts! If not working just replace!

JBL Car Audio &... | Answered on May 14, 2020


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.

JBL Car Audio &... | Answered on Oct 04, 2016


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.

JBL Car Audio &... | Answered on Sep 20, 2016


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).

JBL Car Audio &... | Answered on Feb 22, 2016


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

JBL Car Audio &... | Answered on Aug 26, 2015


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

JBL Car Audio &... | Answered on Jul 03, 2015

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