Question about JBL GTO 301.1 Car Audio Amplifier

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Keeps swirching to protect mode

My amp keeps switching on and off from power to protect no matter if the car is switched on or off and even if the music is loud or quite. what can i do to get it working properly?

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Re: keeps swirching to protect mode

First thing to do is disconnect all of the speaker wires on the amp. Turn on the amp, if it is still turning on and off then there is a definant problem in the amp circuitry. If you have no solid state service skills, I highly advise you to take the amp into a repair shop. If it stops turning on and off turn off the amp and try and connect up one speaker at a time untill the amp starts to mess up. you then take that speaker and have it checked out and inspect the wireing for pinchs or shorts.

Posted on Oct 03, 2006

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Disconnect everything except ground, power, and remote.

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Hello ryan_waslike,

There's a short or a ground somewhere on the system.

Start by checking your wiring and make sure there are no shorts and that there isn't any insulation rubbed off allowing a wire to come in contact with the vehicle metallic body or frame. Then disconnect the speaker and see if the amp will power up without going into protect. If it does, the problem is in the speaker or speaker wiring. Find and correct the problem and power everything back up.

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Hello pianopeter, I have the same amp with the same problem but only when the crossover mode switch on the front channel is set to low pass or high pass. Have'nt fixed that yet cause when I got the amp and put power to it the clip and protect lights would flash back and forth. I turned out to have 2 bad output transistors on the right front channel, I replaced them and amp works great now. Then when I was doing final testing I switched the crossover mode switch to lowpass and your problem occured. I do believe the problem is in the removable board which controls the controls the crossover and input to a point. Try moving the crossover mode switch to flat on both front and rear and let me know if amp works fine that way. I'll be working on this problem soon but would like to know if your problem changes if you move the switch to flat. Please leave me a message as soon as you find out cause this will aid in the process of me fixing problem. I am an electronics tech and buy and fix broken amps all the time so I have a really good knowledge of car amp repair. Once again let me know ASAP, Thanks

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You can try resetting it by turning off your CD player ,removing the Batt( + ) and Gnd ( - ) terminals from the amp for a short period. Reconnect them Allow the amp to receive power but not switch on (keep cd player/remote power source off)

If you dont know how to wire the CD player to control the amps power status , the easiest way is to connect the 'power antenna' or similar low voltage throughput wire from the head-unit to the amp's Remote terminal.

My old amp did the same thing ,and would need to be powered off/on before resuming sound output, sometimes I had lots of trouble with the protect mode staying on , even with little or no sound output from headunit.

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