Question about JBL SCS125A System

1 Answer

Thumping when not hooked up

My sub is plugged in electrically but not hooked up to the stereo and it is making a "heartbeat sound". I tried a couple different surge protector strips so that is not the problem. Blown fuse? This is a confusing problem. Any ideas?

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    MVP:

    An expert that gotĀ 5 achievements.

    Governor:

    An expert whose answer gotĀ voted for 20 times.

    Hot-Shot:

    An expert who has answered 20 questions.

  • Contributor
  • 56 Answers

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!!!

Posted on Mar 23, 2008

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Mtxjh1200 , the light with the lightning bolt blinks and subs make a thumping sound like a heartbeat


ur rca wires or its the holder itself if the subs do it when the rca wirtes are off the oits the bord inside the amp

Jun 21, 2011 | MTX JackHammer JH1200 Car Amp

1 Answer

I have the tvee soundbar with wireless sub and the soundbar works fine but my sub just makes a thumping sound like a heartbeat. i have tried moving it, switching frequency channels, different outlets with...


It is not latching on to the soundbar transmitter. Is the locked light on the device turning on.
Wireless devices are sometimes known to drift. Is the sub silent when the soundbar power is off ?. Even then if its making this sound, the subwoofer amplifier is oscillating at very low frequency. You will need professional help and needs to be repaired.

Mar 10, 2011 | Boston Acoustics TVee Model Two TV...

1 Answer

I hooked up a system in my truck had it for a year everything working fine.i listen to music really loud anyways i have my wires hiddin under my back seat well when someone layed the seat down it cut my...


Because even though your stereo is turned down the gain for the sub is set all the way up so it will still gain a small amount of signal. it is a flaw with some of the newer aftermarket stereos. try turning the nob until the thump stops then change the bass setting on your deck to compensate for the bass loss.

Jan 28, 2011 | Car Audio & Video

1 Answer

Sub making horrible thumping garbage sounds


you need an noise filter in line. It's been a few years since I've had a system but I had the same problem. High power amps like the one you have can actually pick up on the electric pulses from your ignition system. I think I got mine at walmart, or auto zone, somewhere like that. Their pretty cheap too. I don't remember how its hooked up, but If you know how to hook and amp up, this should be no problem.

Jun 23, 2009 | Hifonics Zeus Z400 Car Audio Amplifier

2 Answers

My subs don't bump to the beat, they just go THUMP THUMP THUMP...


It sounds like you need to ask for pro help mate, mybe the amp just needs setting properly, Is the amp on bypass for bass, or does the amp run the complete system

Jun 13, 2009 | Cadence TXA 750D High Power Mono Amplifier...

1 Answer

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...

Apr 02, 2009 | JBL PB12 Subwoofer

7 Answers

Subwoofer "thumping" w. no audio feed


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 :)

Feb 12, 2008 | JBL SCS125A System

1 Answer

Oakley thumps heartbeat only


did you ever get this problem fixed? i have the problem with my 128mb thumps. please respond

Dec 21, 2007 | Audio Players & Recorders

1 Answer

My subwoofers have a heart beat to them


Ok.... FIRST COMMON PROBLEM: recheck your ground connection. Make sure that your amps ground wire is securely bolted to the metal body of your car. Not only that- yo uhave to scrape or use sandpapar to make sure that the terminal is touching bare metal.. this is a very common problem. Nobody realizes that the ground connection is just as impoarant as the power connection... Next unplug youir rca cables from the amp. If the heartbeating goes away then mabye you have a rca cable or deck issue. If you can wiggle the rcas at the amp and make it heartbeat more or less.. then perhaps the rca terminals have come unsoldered form the circuit board... in any case without me looking at it personally this is about all i can tell you. CHeck your connections and GOOD LUCK!!!!!

Aug 26, 2007 | Directed 5108 Car Subwoofer

Not finding what you are looking for?
JBL SCS125A System Logo

675 people viewed this question

Ask a Question

Usually answered in minutes!

Top JBL Audio Players & Recorders Experts

Michael Edwards
Michael Edwards

Level 1 Expert

53 Answers

 Grubhead
Grubhead

Level 3 Expert

4767 Answers

Jerry Greenberg
Jerry Greenberg

Level 3 Expert

1646 Answers

Are you a JBL Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...