Question about JBL SCS145.5 System

3 Answers

Subwoofer makes loud popping crackle intermittently. After moving into new home, I've connected the subwoofer to the stereo. It works, but is making a popping crackle intermitetnly, which gets worse as it's left plugged in. I use a monster subwoofer cable, I'm pretty sure it's in good condition. My father is a construction elelctritian, as has checked the plugs, and they are grounded (although old, still grounded). I've tested the sub, on it's own, in other rooms, just plugged in...not connected to a stereo, on a grounded still makes the noise. I have not yet taken it apart... Any suggestions?

Posted by on

  • 1 more comment 
  • eric murray Feb 25, 2007

    hi "icansurf",

    just to be clear, When you mean "input jack" do you mean a wire to the power supply? or the wires connecting to the input jacks for wires connecting to the stereo.

    The reason I ask is because this popping noise happens when i just plug it into a wall socket, and not connected to any stereo equipment.

  • eric murray Feb 25, 2007

    thank for the input...

    I took it apart. I noticed that the actual speaker is connected to (the big sealed black box where everything is) with 2 heafty stereo wires that basically slip onto the speaker -- they are are firmly.

    The actual unit is sealed...and at a risk of cracking it I decided against taking it apart.

    I looked for more screws or a "lift here with screwdriver" area but couldn't figure out "the black box".

    if you have any tips...I might give it one more try, but failing that ... it's going in the dumpster (maybe I should hold on to the speaker and cabinet, for parts...)

  • Anonymous Mar 14, 2009

    I have the same problem with a Cerwin Vega self powered sub. It is definitely a home wiring issue. I tiik the sub to a friends house and hooked it up on his sytem with no problems. I brought it back home and it pops and crackles like crazy just sitting there plugged into the wall. If I turn on my dryer it really gets bad. My house was built new 6 years ago, and when I called my electrician he basically said "oh well".



3 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Im having the exact same problem thinking it was the amp i rigged up a different driver,the amp was fine.i knew the driver wasnt gone and after some looking and testing i got it down to wire mesh(i think a dust sheild,something)inside which was slightly rubbing on the coil,it worked fine loud when it was warm but cold there was bursts of bad feed back noises.

Posted on Mar 14, 2008

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Hey erockalot...Did you ever get your problem resolved....I am having the same exact problem with my Cerwin Vega VE 28 S subwoofer.....I had the amp replaced by Cerwin Vega....and everything seemd fine again until yesterday...About 2 months after I received the new amp...the same problem started again. It has to be something with the electrical supply from my condo....I can't believe 2 Cerwin Vega amps would go bad so quickly...something has to be causing this outside of the amp itself.

Posted on Aug 30, 2007

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 72 Answers

Could be one of the internal wires is loose, possibly where it connects to the back side of input jack.

Posted on Feb 25, 2007

  • Ican Surf
    Ican Surf Feb 25, 2007

    I think it could be either. If the stereo inputs are shorted together in a powered speaker like yours, I can see where it might pop and crackle when you just plug in the AC power. On the other hand, a bad component in the internal power supply could cause crackling too, without any problem present in the stereo input wires. Id say open the sucker up and look for loose things or burnt looking or smelling things. Oh yeah... be sure to unplug it first :)

  • Ican Surf
    Ican Surf Feb 26, 2007

    I'm guessing the amplifier is in the black box. Also sounds like it's epoxy sealed and you can't get inside it without destroying it. You could test the speaker alone by disconnecting the regular amp wires and hook up an audio source directly to the speaker terminals.


1 Suggested Answer

  • 2 Answers

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

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Sub Speaker giving intermittent loud crackling and sharp loud popping sounds even with main volume control turned off. Crackling sound can be reduced by turning sub volume control off.

It may be the control itself too. In time, these controls can get dust build up inside it. There are volume control spray cleaners available from Radio Shack or other electronic parts stores. The cheat on cleaning the control is to just rotate it from stop to stop as many times as it takes to clear the noise.

Mar 17, 2016 | Altec Lansing Acs295 Subwoofer

6 Answers

When i turn the volume up to(17-20) my sound cuts out and my speakers make a cracklin noise.i have bought new speakers and rechecked all speakers are rated at 50 watts rms and my stereo pumps out...

It seems you needs more power to maintain the level of good sound.Maybe the maximum volume is 30 - then the mininum is 15 and you can't hear any cracking sound. If you exceed 15 the minimum, as you said starting 17 - 20 you hear crackling sound .Then you reach ,what they called the "cliping level"so much distortion and crackling sound,your stereo too small to accomodate .You must add a power amplifier so crackling will gone and to fit your listening pressure...

Hope it may help you;


Sep 21, 2008 | Car Audio & Video

4 Answers

Klh powered subwoofer model ASW10-120B... when you plug in to power... it makes a loud buzzing/humming noise

I would check the caps on the power supply. They are rather large electrolytic capacitors that will look like they burst and/or leaking. When these die, the caps ground and the sub will make a loud buzzing sound. If you are handy with a soldering iron you can replace them yourself. Replace them with the same voltage or a little bigger and same with the size.

If the cap. says 16v 4700pF on it, for example, a 20v 5300pF or a 16v 6200mF cap. will work for this application.




Jan 05, 2016 | Audio Players & Recorders

1 Answer

My Bose Cinemate series ii is making very loud intermittent crackling sounds

Usually made from interference of some sort. Make sure that all wire connecting from both the input on the receiver and the output devices are properly secured and have no rips or tears in them. Also make sure there is nothing close the receivers with a powerful magnet (big subwoofers, powerful speakers, computers, etc) those can also cause interference. Hopefully this helps.

Sep 25, 2012 | Bose 318842-1100 - Cinemate Series Ii...

1 Answer

Powered Sub Woofer emitting lound crackling noise

i would say so sounds like woofer is dying unless u pull it apart and replace the woofer it doesnt have to be same brand just same size and watts and ohms then u can keep it

May 28, 2010 | JBL 5.1-Channel Home Theater Speaker...

1 Answer

Technics SU-G95 Amplifier, Intermittent popping/crackling noise

The heat sink has the power modules attached but also has 2 power transistors that become disconnected from the circuit board when the heat sink moves or flexes. The pins on each need to be resoldered (it helps to bend them a bit too, prior to soldering). Had the same problem on the same amp today and that was the fix. There was no sound other than a clicking when the volume control was rotated.

Jun 09, 2009 | Audio Players & Recorders

1 Answer

Crackles and pops,even in standby mode

Does it only pop and crack when its connected to your amp or receiver ? i have the same thing with my sub [its not cerwin vega] but when i turn my amp off the sub doesnt pop anymore so i think my amp is the problem not the sub , yours might be the same problem .

May 19, 2009 | Cerwin Vega VE-28S Subwoofer

1 Answer

Soundsticks have developed a loud intermittent annoying crackle


Dec 28, 2008 | Harman Kardon SoundSticks Computer...

1 Answer

Cerwin Vega ve-28s subwoofer and new Cervin Vega 2-way satellites

I bought my VE-28s and it did exactly that crackled, cerwin replaced part in amp but few months later problem persisted. they then replaced entire amp assembly and its been fine. i really push it to and its been fine. to test it, unplug the connection from amp/ reciever and see if it persists. if so its the sub, if not its the amp/ reciever. dont dump it, these subs really crank and can put out some deep loud bass.

Oct 28, 2007 | Cerwin Vega VE-28S Subwoofer

1 Answer

Crackling Sound From Subwoofer

Check any wiring coming or going to the subwoofer. It sounds like it could be a loose connection.  Is there a LFE or bass boost knob on your subwoofer? Does turning that up/down cause the crackling (if it exists). If so, you could use some tuner cleaner to clean the contacts on the potentiometer knob.

If the crackling is on the subwoofer only, it might be damaged from bottoming out.  See if you can remove the baffle or grille covering the woofer and inspect for visual problems. You can also try to lighly push in and out on the subwoofer to hear if it makes any scraping sounds. If so, it is definitely damaged and the driver will have to be replaced.


Jan 21, 2007 | Altec Lansing 221 Computer Speakers

Not finding what you are looking for?
JBL SCS145.5 System Logo

5,878 people viewed this question

Ask a Question

Usually answered in minutes!

Top JBL Audio Players & Recorders Experts


Level 3 Expert

5683 Answers

Jerry Greenberg
Jerry Greenberg

Level 3 Expert

1690 Answers

Steve Allison
Steve Allison

Level 3 Expert

5569 Answers

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

Answer questions

Manuals & User Guides