Loud hum from subwoofer - AVS Forum
Forum Jump: 
 
Thread Tools
post #1 of 6 Old 11-29-2004, 10:09 AM - Thread Starter
Senior Member
 
bshor's Avatar
 
Join Date: Jun 2001
Location: Chicago, IL USA
Posts: 238
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Hello,

I've had my Energy EXLS8 Sub for probably about 5 years now. It's worked very well for me over that time.

Now, however, there's a strange and very loud hum emanating from the sub whenever I turn the output dial to anything higher than zero in any application: DVD, TV, etc.

No other speaker in my 5.1 setup exhibits this problem. I'm using an Onkyo 801NR receiver.

What could be going on? Is the Energy sub shot?

Thanks!
bshor is offline  
Sponsored Links
Advertisement
 
post #2 of 6 Old 11-29-2004, 10:14 AM
AVS Addicted Member
 
thebland's Avatar
 
Join Date: Jan 2001
Location: Detroit, Michigan USA
Posts: 23,627
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
Quoted: 81 Post(s)
Liked: 91
Have you changed anything in your system, changed the outlet, anything new (even if any appliance was plugged into that circuit) that may have caused this.

There are more than a handful of [op amps] that sound so good that most designers want to be using them as opposed to discreet transistors. Dave Reich, Theta 2009
thebland is offline  
post #3 of 6 Old 11-29-2004, 11:21 AM
AVS Special Member
 
Morbius's Avatar
 
Join Date: Nov 2000
Location: Livermore, CA USA
Posts: 4,728
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 13
Quote:
Originally posted by thebland
Have you changed anything in your system, changed the outlet, anything new (even if any appliance was plugged into that circuit) that may have caused this.
Jeff's correct.

A loud hum is indicative of a "ground loop".

There are any of a number of ways for you to inadvertently cause a ground loop - like
changing how components are plugged in.

A ground loop is often difficult to localize. The cause may be due to some appliance
that is not part of the audio system - but is plugged into the same branch circuit as
the audio system.

Good Luck.

Dr. Gregory Greenman
Physicist
Morbius is offline  
post #4 of 6 Old 11-29-2004, 12:13 PM
Senior Member
 
Micah008's Avatar
 
Join Date: May 2004
Location: La Crosse, WI
Posts: 492
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I had a similar problem, and it was because the amp went bad in my sub. Same problem existed when I plugged it into a totally different room, which probably wouldn't have happened with a ground loop.
Micah008 is offline  
post #5 of 6 Old 11-29-2004, 01:03 PM
Member
 
SoccerGuy's Avatar
 
Join Date: Nov 2004
Location: Medina, OH
Posts: 16
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
I had the same problem. I checked all my outlets with an outlet checker. Unplugged all components and still was getting humm. Turns out that my cable was not grounded. I recently upgraded to digital/HDTV cable, and the installer forgot to ground. Hooked up the ground wire. Fixed my subwoofer humming and the banding on my projector.
SoccerGuy is offline  
post #6 of 6 Old 11-29-2004, 01:14 PM - Thread Starter
Senior Member
 
bshor's Avatar
 
Join Date: Jun 2001
Location: Chicago, IL USA
Posts: 238
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 10
Thanks everyone, I figured out the problem.

I had wedged the sub against the wall (not much maneuvering room in my apartment), and the sub cable eventually was just flexed too far and gave out. After checking the cable out closely, a few pushes were enough to break off the end of the cable; it had probably been barely attached.

Anyway, I tried using a basic RCA cable to test the connection, and the sub works. Now off to get a cheap, decent cable for the sub ...

Anybody have experience with PartsExpress.com's Dayton Subwoofer Cable? $12 sounds good...

Thanks again for the suggestions!
bshor is offline  
Closed Thread Subwoofers, Bass, and Transducers

User Tag List

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off