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Posted on Feb 27, 2017
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Thumping Subwoofer I have had this problem for quite some time but learned to live with it but doing some extensive research has lead me to believe that I can possibly correct this. System: Kenwood VR-6060 JBL SCS 145.5 speaker system (connected via LFE) I get a loud thump through my powered subwoofer whenever I switch listening modes on my receiver and when I shut it down. Note, that when I turn my receiver on the thump does not occur as the display reads ?Mute? when the unit first starts up. However, when I mute the system it thumps first, then mutes. When I unmute it there is no thump. Other than that the system works fine. No humming, no other noises. -The thump does not occur in any of the other speakers. -I exchanged the subwoofer when I first purchased it, thinking that it was a manufactured problem. -I have purchased a high quality Monster cable for the LFE connection. -I have tried the subwoofer on a friends system and it worked fine, no thump. -I have tried switching the amp on the sub to ?Always On?. -I have also tried switching the receiver from ?Full Auto? to ?Digital Manual? but whenever the system moves from a Dolby Digital signal (such as my Xbox) to and analog signal (such as TV) the thump persists, not to mention the thump still remains on shutdown. -I have tried grounding the sub to the amp. I have heard some people talk about ?ground loops? and how that may be the case. I am aware that this may have an effect on humming noises but could an isolator remove this thump as well? Neither the sub nor the receiver have an earthing/ground prong so I am not sure if the ground loop will have an effect. My house has pretty old electrical wiring, like 20+ years so it maybe an electrical issue but I just want to know if there is away around it. The only thing I haven?t done is unplug everything and set up both the receiver and the sub at a different, newer house. My only hesitation is because I am lazy to unplug and replug everything but if this is the only way to isolate this issue I will. Your thoughts and ideas are greatly appreciated. Richard

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  • richard320 Mar 24, 2009

    I don't have a specific LFE output setting on my receiver but I can adjust the subwoofer level from -10db to +10db. I will try adjusting the volume on both.

  • jason May 11, 2010

    your systems lfe output level settings should be checked and sub, it may also be that if the sub is not getting a signal in a different setting then it will start to thump because the sub level is high but no signal, and if that don't do it then its the lfe output circuit that needs testing and or component replacement

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2 Related Answers

Anonymous

  • 277 Answers
  • Posted on Jan 31, 2006

SOURCE: Connecting subwoofer to receiver.

have u checked that the sub option on the reciver is on?

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Mike LaPres

  • 757 Answers
  • Posted on Jun 18, 2011

SOURCE: Cannot get the subwoofer to

After making sure that your subwoofer is receiving power, as most models have their own amplifier, make sure that it actually is turning on. There is a possibility of a faulty power switch. Lets rule that out first.
Once the switch is on and the proper power connection is verified, turn your attention to the setup menu on your receiver. Navigate to the LFE/Sub output level. Adjust it up all the way. Then navigate to the crossover setting. Turn it up all the way. If the subwoofer also has it's own control panel including a crossover, turn that up all the way as well. Then with an input on the receiver that has a subwoofer output set up such as for DVD, play some audio. Or likewise you can also use the receivers' test tone capability that will pan each channel individually with a wide band pink noise signal that also includes a signal sent to the subwoofer output.

If this procedure does not produce results then send me a message including your subwoofer model and your observations of your systems' operation.

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