JBL GTO75.4 Car Audio Amplifier Logo
Posted on Sep 14, 2008
Answered by a Fixya Expert

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My Jbl mono amp cuts out

My amp is pushing two jbl 8 inch subs and they just stopped working the 3 blue led's will flash and the speakers make a thump at random intervals and the lights in the car will dim at the same time

  • Anonymous Mar 28, 2014

    i installed a gravity 2100.1 mono block amp and now Im getting this unwanted humming and/or thumping in my subs. is there an easy way to fix this problem

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1 Answer

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  • Master 631 Answers
  • Posted on Sep 17, 2008
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Joined: Sep 16, 2007
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It's likely that the amp has blown output transistors. To eliminate other possible problems, read through the following page:

Amp Going into Protection Mode

Let me know if you have any other questions.

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Related Questions:

1helpful
2answers

JBL amp, worked fine untill 2 days ago. protection light on..

might have roasted your speakers voice coils a little which may be sending the amp into protect mode throw a speaker on it that you know works and if it doesnt trigger the protect circuit then you probably have a blown or almost sub.
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Bridging outputs on JBL BP300

Hello paulnkate,

The BP300.1 is a mono (1 channel) amp. You cannot bridge a mono amp. Bridging is a method of combining the outputs of 2 or more channels of a multichannel amp into a single mono load. On your amp you would connect a single sub to one of the +'s and one of the -'s (either one is OK, they are connected internally). The other pair of terminals is just for convenience, making it easier to connect, if you want to power 2 subs.

Hope this helps.
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Pb12 makes thumping sound after warming up

Hello there..Thats normal only if your sub volume and the pre amp is turned up..Your amp is the cause of the speaker jump..Turn amp volume sub level down a few and check your wire from sub to amp..If all of that is good is a normal operation for pre amp warm up in sub if level is turn to max..Try unplugging amp freom sub then turn sub on stand alone(just sub outlet plugged in and no wires from base amp plugged in..If sub stops the its the amp making the problem..If it still is there then the pre amp is either dusty on inside or the outlet plug that it is plugged in doesnt have a good ground..Hope these help to solve your problem..Have a great day...

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_a3369546f8067589

0helpful
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I have a jbl W15GTi MKII 15 inch and on the speaker it has to a a an b side and two wires no each side how do you hook it up

Your speaker has dual voice coils. You can hook it up so that it is 2 ohm or 4 ohm depending on wat the amp can handle. You can try hooking it up by matching the colors or like any other speaker.
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Thump at the time of shutoff

The amplifier in the sub as with any other amplifier has a capacitor in it. Essentially a battery that holds a charge. When you trun things off such as subs or amps with a powerstrip instead of the intended on off button, the power supply has been cut, but the capacitor is still energizing the unit. So it catches the noise in the line.
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JBL Sub Amp Wiring Please

it seems rather redundant to bridge a mono amp. Unless the instruction manual states otherwise, i would assume that one speaker output is identical to the other (ran in parallel, like an A or B speaker, not like Left or Right), and you would present the amp with a two ohm load by wiring one speaker to each output. Bridging it may or may not work, but, again, it just seems redundant.
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Jbl gto 3501 amp

It's a mono amp. There's no bridging with this amp.

The two pairs of speaker terminals are connected together internally. The second set of terminals is for convenience.
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Amp cutting out, intermittent fault

i suggest using a 4 gauge or smaller i had the same problem. i switched from 8 to 4 and no problems!
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