COLLECT WATCH TRACK RATE REVIEW APP
Manage your own movie collection and always keep it with you with our Apps. Price track movies and get price drop notifications instantly. Become a member to take full advantage of all site features.
GET STARTED

Best Blu-ray Deals

Best Blu-ray Deals, See All the Deals »
Top deals | Price drops  
 All countries United States United Kingdom Canada Germany France Spain Italy Japan
The Amazing Spider-Man 2 (Blu-ray)
$64.99
The Dick Van Dyke Show: The Complete Series (Blu-ray)
$62.99
South Park: The Complete Seventeenth Season (Blu-ray)
$19.99
Sleeping Beauty (Blu-ray)
$24.99
Bates Motel: Season Two (Blu-ray)
$29.99
Game of Thrones: The Complete Fourth Season (Blu-ray)
$39.96
Doctor Who: The Complete Eighth Series (Blu-ray)
$64.96
A Nightmare on Elm Street Collection (Blu-ray)
$29.99
Maleficent (Blu-ray)
$19.99
Dragon Ball Z: Season 9 (Blu-ray)
$24.99
Cosmos: A Spacetime Odyssey (Blu-ray)
$29.99
Lost: The Complete First Season (Blu-ray)
$19.49
Friday the 13th: The Complete Collection (Blu-ray)
$79.99
Once Upon a Time in America (Blu-ray)
$13.89
A-Channel: Complete Collection (Blu-ray)
$19.99
24: Live Another Day (Blu-ray)
$29.99
Transformers: Age of Extinction 3D (Blu-ray)
$26.99
Prince of Persia: The Sands of Time (Blu-ray)
$9.49
Transformers: Age of Extinction (Blu-ray)
$17.99

Go Back   Blu-ray Forum > Audio > Subwoofers

Reply
 
Thread Tools Display Modes
Old 11-18-2012, 06:10 AM   #1
DIGITALBATH DIGITALBATH is offline
Active Member
 
DIGITALBATH's Avatar
 
Apr 2008
Seattle, WA
38
110
1
2
Default Did I ruin my sub, or do I have a ground loop?

Hello,

I have a pretty elaborate home theater with many devices, wires etc. Today I was fidling with my TV antenna, which sits on my subwoofer(was this a huge mistake?) and in the process of moving the antenna around I sort of knocked out the rca line inputs in the back of my subwoofer. The sub(old velodyne VA-1012-B) starting humming loudly, and in desperation I tried to jam them back in. Eventually after unplugging the sub, I decided to give it a rest and hooked an infinity hts-20sub, which also started humming away.

After a lot of reading online, I unhooked all of my equipment, tried 3 different rca cables, tried a cheater connection, two different outlets. When I plug in either sub into power they turn on and don't hum, as soon as I plug in a rca into line in and turn volume up, very loud hum. I even went to radio shack and got a ground isolator, and that did nothing to change my predicament. It's strange that both subwoofers are exhibiting the same behavior, maybe I caused a short, I know I really pissed off my apartment manager one time when I tried to use fluorescent lights in the bathroom and caused a short, sparks.

Just a little background on the velodyne, we replaced a resistor last year, but he rca inputs were not screwed in as tight as they could have been, now they have been tightened.

Please help!
Acer H9500BD 1080P 3D,120" Visual Apex 1.1 gain motorized Screen.
Panasonic 65ZT60
Onkyo TX-SR818
Paradigm Montitor 7. Ver. 4, Paradigm CC-290 Ver. 5
Klipsch Quintett III, Velodyne VA-1012
120 GB SLIM PS3, S.E. MW2 XBOX 360 Elite
2.4 Gig Mac Mini,Asus CG5270Razor Mako 2.1

Last edited by DIGITALBATH; 11-18-2012 at 06:14 AM.
  Reply With Quote
Old 11-18-2012, 02:03 PM   #2
Blu-Dog Blu-Dog is offline
Blu-ray Samurai
 
Blu-Dog's Avatar
 
Dec 2007
Lancaster, CA
9
1
Default

De-power everything on circuits to the receiver and subwoofer, and power up only those two units. Sounds like you have a loop going to something else that's being used.
  Reply With Quote
Old 11-18-2012, 02:04 PM   #3
soundwave628 soundwave628 is offline
Senior Member
 
Jul 2011
Default

my sub just started humming today aswell. It ended up being because my fiance plugged a hair straightener into the same wall(not outlet) as the sub and maybe my houses wiring is old? how many things share the same outlet etc with your sub?
  Reply With Quote
Old 11-18-2012, 04:36 PM   #4
DIGITALBATH DIGITALBATH is offline
Active Member
 
DIGITALBATH's Avatar
 
Apr 2008
Seattle, WA
38
110
1
2
Default

I have about 7 items plugged into the surge protector, which goes to an outlet, where there is another device plugged in. I did try unplugging everything and using just receiver and subwoofers, still no change. By humming, I mean a loud hum, and no sort of music. I even hooked up a dvd player, and could hear faint music on one, but not bass signals.
Acer H9500BD 1080P 3D,120" Visual Apex 1.1 gain motorized Screen.
Panasonic 65ZT60
Onkyo TX-SR818
Paradigm Montitor 7. Ver. 4, Paradigm CC-290 Ver. 5
Klipsch Quintett III, Velodyne VA-1012
120 GB SLIM PS3, S.E. MW2 XBOX 360 Elite
2.4 Gig Mac Mini,Asus CG5270Razor Mako 2.1
  Reply With Quote
Old 11-18-2012, 08:50 PM   #5
Big Daddy Big Daddy is offline
Moderator
 
Big Daddy's Avatar
 
Jan 2008
Southern California
79
122
1
Default

Don't use ordinary RCA cables. Use a subwoofer cable that is double shielded coaxial RG59 or RG6. Make sure the sub cable is not touching other cables or power sources.

Read Ground Hum & Ground Loop Isolators.
HT Room: Panasonic PT-AE8000, Epson 1080UB Proj., Mitsubishi 65" Diamond Series HD TV, Yamaha-RX-A3010 Rec., CinePro 6-Ch. Amp. (350 W/Ch, 8 Ohm), Proton D1200 Amp., Behringer EP4000 & EPX3000 Amps., Oppo BDP-83, Sony BDP-S790, Audio Technica Tuntable, Mitsubishi S-VHS, 2 Def. Tech. Super Towers w 15" subs, 1 Def. Tech. Center & 1 Martin-Logan Center, 2 Def. Tech. Surr. & 2 PSB Surr., 2 Cadence Presence, 2 Bose 901 Rears, 2 Modified HSU 12" Subs, 1 ED DIY 12" Sub, 1 ED DIY 15" Sub, Velodyne SMS-1 Subwoofer Equalizer, DirecTV HD, Monster HTS 5000 & APC H15 Power Conditioners.
Two-Channel Room: XiangSheng Tube Preamp., Carver TFM-45 Amp. (375 W/Ch), Behringer EPX4000 Amp., Onkyo CD player, Denon Turntable, Yamaha Tuner, 2 Vintage Polk RTA-15TL Speakers, 2 LCY 100 Super Tweeters, 2 DIY Folded Horn Super Towers with 15" Sub., 1 Modified AA HD-SUB12
Family Room: Mitsubishi 73" Diamond Series TV, Yamaha DSP-A3090 Rec., DirecTV HD-DVR, PS3, Zvox Speaker, 1 DIY 12" Sub.
  Reply With Quote
Old 11-18-2012, 11:17 PM   #6
Tom V. Tom V. is offline
Senior Member
 
Jul 2012
Default

Try a different cable. Sounds like one of the internal solder joints one the terminated end on the subwoofer side might be iffy. You likely eliminated the sub as a variable by trying two.

Also, any old composite video cable will work fine. They are well shielded for video use which translates over to sub use.

Tom V.
  Reply With Quote
Reply
Go Back   Blu-ray Forum > Audio > Subwoofers


Thread Tools
Display Modes

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

Forum Jump


All times are GMT. The time now is 11:54 AM.