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Strange sound coming from subwoofer


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#1 bush

bush

    Devil Without A Cause

  • Joined: 05-April 03
  • Location: Latvia, Kadaga

Posted 21 September 2008 - 11:51

Hello, dear Neowinians :)

This is my 5.1 system.

Today it started to make some strange sound - you can check the attached audio files.

When I tilt the subwoofer, this grinding sound dissapears but reappears as soon as the subwoofer touches ground.

Also it seems that this sound comes and goes in waves.

Is this a warranty issue or is this my issue?


Thanks!

Attached Files




#2 2s2k

2s2k

    Neowinian Senior

  • Joined: 22-December 03
  • Location: Belgium

Posted 21 September 2008 - 13:36

I don't know what the problem might be but you might look for the manual and check if it's still under warranty.

PS
have you put it too loud? :D

#3 Starbuck84

Starbuck84

    Would You Kindly?

  • Joined: 26-June 07
  • Location: Breda, Netherlands

Posted 21 September 2008 - 13:41

I'm just guessing here, so I could be completely wrong, but did you check the cable connection? IE when you tilt the subwoofer the cable makes a better connection and when you put it down the connection is rubbish again? What I am trying to explain is, unplug and replug all cables? :)

#4 OP bush

bush

    Devil Without A Cause

  • Joined: 05-April 03
  • Location: Latvia, Kadaga

Posted 21 September 2008 - 13:42

thanks for the help.

no, it's not on loud :)

and ok, i'll check the cables.

#5 Cormier6083

Cormier6083

    Eat My Spaghetti Noodle!

  • Joined: 16-September 06
  • Location: Louisiana

Posted 21 September 2008 - 13:43

May be your cables.

I had a woofer that was making a weird noise, like a vibrating wave type noise, and come to find out, it was the amplifier. :)

#6 Chook

Chook

    Neowinian

  • Joined: 08-August 05
  • Location: Sydney, Australia, MATE

Posted 21 September 2008 - 13:47

dude, i have such a similar problem. it comes and goes.
my woofer (and partially, the speaker that is next to it) randomly starts this scratching scrabbly sound and if i dont pull it out of the back of the unit in time it BLASTS me with this massive beep... like full volume no matter what volume the system is actually set to. it freaking ****es me off. and sometimes itll work for a while before slipping back into it. arghhh

#7 smooth_criminal1990

smooth_criminal1990

    Neowinian

  • Joined: 28-August 08
  • Location: Herefordshire, UK

Posted 21 September 2008 - 13:53

if its a subwoofer with the speaker diaphragm (the wobbling bit) facing down or backwards, a bit of paper or plastic leaning against it would make a buzzing sound as it vibrates. Happened to me a while ago.

#8 +Tikimotel

Tikimotel

    Neowinian Senior

  • Joined: 13-August 01

Posted 21 September 2008 - 14:03

My subwoofer is connected to my amplifier via the LFE channel, it needs a coaxial cable with good shielding to operate properly.
Before I used a "normal" RCA cable, it crackled all the time.

#9 Attie

Attie

    Neowinian

  • Joined: 19-March 08
  • Location: Wield, Hants

Posted 21 September 2008 - 16:00

its possible its a grounding problem

make sure the amp is plugged into the same wall socket as your pc - on an extension or multiway extension is fine.

#10 Starbuck84

Starbuck84

    Would You Kindly?

  • Joined: 26-June 07
  • Location: Breda, Netherlands

Posted 21 September 2008 - 21:53

My subwoofer is connected to my amplifier via the LFE channel, it needs a coaxial cable with good shielding to operate properly.
Before I used a "normal" RCA cable, it crackled all the time.



Little off topic maybe, and I am sorry for that, but you do know that the LFE channel is an analog signal right? I mean no need for coaxial cables. :)

#11 Attie

Attie

    Neowinian

  • Joined: 19-March 08
  • Location: Wield, Hants

Posted 22 September 2008 - 00:48

how very wrong you may be.

if the sub is active (has its own amp) then the signal has to get to it in the 50mV range. at this level noise is very prominent, and as it almost definately not professional hardware, it will not be running off a balanced input, meaning that the noise will be a problem... sheilded cable is one way to cancel out the noise...

:)

#12 Starbuck84

Starbuck84

    Would You Kindly?

  • Joined: 26-June 07
  • Location: Breda, Netherlands

Posted 22 September 2008 - 12:29

All I was trying to explain with my previous post is that the LFE channel itself is analog, so for the best results you would need an analog shielded cable, not a coaxial cable with the wrong impedance value. A cable like this for instance: Profigold. (This is not the best cable per se, just a reference). As you can see, in fact this cable is nothing more than a mono analog shielded cable. Otherwise look it up at dolby or wiki, and you'll see I'm correct that the linkage between your amp and your active sub is analog. (And that was my whole point, I never said you didn't need good shielding...)

I am not gonna respond to this anymore, seeing we are going way off topic with cable clutter.

Speaking of this topic, did you check your cables TS? Haven't heard from you if you resolved it or not, kinda curious now. :)

#13 OP bush

bush

    Devil Without A Cause

  • Joined: 05-April 03
  • Location: Latvia, Kadaga

Posted 02 October 2008 - 10:19

Sorry, i was away.

I reconnected the cables and since then there has not been any annoying noises. except maybe once, but quiet and short. All the cables from 5 speakers go to subwoofer. I reconnected the subwoofer ends and now it seems to be working fine :)

Thanks for advices, guys!



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