Question about JBL GTO 301.1 Car Audio Amplifier

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JBL GTO 301.1ii protect mode

I have the JBL gto 301.1ii amp. i only have remote power and ground hooked up and its in protection mode never comes out i really need this amp workin due to buying ma audio subs yesterday any help will be great thank you in advance

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  • Anonymous Mar 23, 2014

    Protection light and white jbl logo blinking

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  • 655 Answers

Hello roets81,

Check the voltage at the amp. It's possible that the voltage is either too high (above 16V) or too low (below 8.5V). Also make sure that the amp case is not grounded. If these check out OK, the most likely cause is that the amp itself is defective and requires service.

Hope this helps.

Posted on May 27, 2009

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Posted on Jan 02, 2017

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Need a schematics for a jbl gto 751.1 ez car amp please


Disconnect all speaker connections and rca cables. Leave power, ground and remote wires intact. Try turning on again. If you still have a protection light your amp is faulty. Hopefully you have warranty . Are you a technician? .A thumbs up would be greatly appreciated if this answer is helpful to you
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Jan 04, 2015 | Car Audio & Video

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I have a JBL GTO 7001, it switches in an out of protection mode. i pulled out the amp, an noticed that the positive wire from the speaker was pulled out. so i disconnected the power scorce an reconnected...


Make sure that your positives and negatives are lined up correctly. This happened to me during my latest install and the problem was I had one positive speaker wire plugged into a negative speaker terminal. This switches the amp on after a few seconds and then back to protect mode once it detects a faulty speaker wire. Hope this helps!

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I got the live and earth leads the wrong way round but now there the right way and the amp wont come on at all. theres no protection light and the fuse is ok???


you will need to disassemble the entire amp, check all components and replace burned ones.
some components burn when wrong polarized.

Jun 02, 2010 | JBL GTO 301.1 Car Audio Amplifier

1 Answer

Protect mode is on what could be the problem its not fuses checked that


There could be a number of reasons the protect light is on. Blown speaker, blown amp, overheating, ohm load is to low and the amp not stable, ect.... Start by checking all of your connections, then if you have a DMM set it to the ohm setting and check each speaker connected to the amp. If its a 4 ohm speaker the number should be around 3.5-4.5 (the #'s can move) If the # jumps all over the place then the speaker is fried. And don't forget to check the ground...it can cause all kinds of problems...hope this helps

Mar 28, 2010 | JBL GTO 601.1 Car Audio Amplifier

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The amp goes in and out of protected mode


could be the sub wired incorrectly to the amp.i have had same problem and used same fix. everything has been workin fine ever since. check out this link an select the correct option for your set up an it will show you the sub to amp wiring
http://www.crutchfield.com/learn/learningcenter/car/subwoofers_wiring.html

Mar 03, 2010 | JBL GTO 1201.1II Subwoofer Mono Amp - 800W...

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Amp switches from power to protect over n over


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.

Hope this helps.

Aug 02, 2009 | JBL GTO 301.1 Car Audio Amplifier

1 Answer

Amp goes into protect when turned up to higher volumes


check the ohm load on your speakers, you might have to low of an ohm and the amp is going into overcurrent protection mode, with the amp off use a multi meter at the speaker terminal with the speaker conected, should read 3 to 4 ohms, if it is lower then thats the issue, you also could have a short on one of the speaker wires, look for am=ny wire pinched in the door jamb or on the speakers, sometimes the terminals are close to metal in the door and you wont notice it. give it a try.

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Amp is putting itself in protection mode.


I would check to see if you have a secure ground and check all of your connections for shorts.

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Jbl stereo does not have power


You need to confirm that you have B+ and remote voltage at the amplifier.

With your multimeter set to DC volts, the black meter lead on the ground terminal of the amp and the head unit on (so the amp will have remote voltage applied), touch the red lead alternately to the B+ and remote terminals of the amp. If the voltage is below ~11 volts, you need to check the wiring feeding whichever line is too low.

Dec 23, 2007 | JBL GTO 301.1 Car Audio Amplifier

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