20 Most Recent JBL SCS125A System Questions & Answers

You need to check your ground connection. If there is a bad ground there will be feedback to the amp and it will just sit there and loop back with the Thump, Thump, Thump sound. I had to wire my amp's ground all the way back to the negative battery terminal. It was a pain but I have never had a problem since :)

JBL SCS125A... • Answered on Oct 08, 2016

How to connect im911

JBL SCS125A... • Answered on Mar 14, 2012

may be its speaker have some problem. its tweeter is working that's why u get a very low volume through that speaker. change the speaker in side that box and then try.

JBL SCS125A... • Answered on Dec 23, 2010

Before you blame the speaker one simple test needs to be made, if you have not done so already.

If one remaning speaker has full volume output, swap one of the 'defective" speakers to that same channel the "good" speaker was attached to, and see if the output drops.

JBL SCS125A... • Answered on Nov 23, 2010

Malfunction in the amp or to high signal on the input protect relay is cliping

JBL SCS125A... • Answered on Dec 31, 2008

First thing to check are signal cables but broken fuse telling me that problem is 99% in sub power supply unit or the amp.If you have a voltmeter and if you KNOW how to do it dissasembly it and check DC voltage on a speaker conntacts.If there is any DC present your amp is worn out.But this can be VERY DANGER because 220/110V is there so if you are not 100%sure that you can do it DON'T!!!

JBL SCS125A... • Answered on Mar 23, 2008

PAIRING THE JBL SB400 FOR WIRELESS OPERATION After turning the soundbar and subwoofer on for the first time, you will need to "pair" the subwoofer and soundbar so they both operate at the same wireless frequency. To pair the units, press the Wireless Pairing switches on both units within 30 seconds of each other. The units will communicate with each other and operate at the same frequency.

JBL Audio... • Answered 16 hours ago

If the red light is flashing you have a short in a speaker wire. IF that light is on all the time it indicates that the voltage to the amp is too high.

JBL Audio... • Answered on Mar 15, 2021

The process involved in troubleshooting and repairing that amp requires specialized tools and meters. You would need to check all the capacitors to see if they are okay by using ESR and capacitance meters, To check the semiconductors you need to unsolder at least one leg and check them unless they are integrated multistaged devices. IF they are you need to check their current draw.

JBL Audio... • Answered on Jan 06, 2021

For the JBL Awake
I just had the same issue and i found a way to solve this :
1. Unplug the power supply
2. Plug it back while holding the [ON/OFF] button
3. The screen shows “UP9” again
4. Do the update with the JBL Music app (I did it with my old iPhone 4s plugged on the 30pin connector)
5. Finish the firmware update ... until the app tells you to unplug the power before restarting the device
(Sorry for my bad English, i’m French)

JBL Audio... • Answered on Sep 04, 2020


JBL Audio... • Answered on Aug 18, 2020

Maybe because they are difficult to find now a days and there are a lot of them around too.

JBL Audio... • Answered on Jul 24, 2020

The controls for the JBL Charge 3 are up top and you have volume up and down, Bluetooth pair, power, play/pause, and a button to link this device to other JBL speakers. There is no skip button, but if you hit the play button twice quickly it will skip to the next song

JBL Audio... • Answered on Jun 18, 2020

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