Question about JBL SCS145.5 System

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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 plug...it still makes the noise. I have not yet taken it apart... Any suggestions?

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  • 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".

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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

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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

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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.

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