Question about Sony Audio Players & Recorders

1 Answer

I have a Sony subwoofer for the home entertainment theater. There is a loud hum coming from the subwoofer. The hum persisits even if unplugged from the receiver. Also, I've tried a ground loop isolator and plugging it in to different outlets and using the two-prong adapters. Nothing gets rid of the hum. Any sugestions

Posted by jtrippe on

Ad

1 Answer

Jacques Marin

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

  • Master
  • 566 Answers

Hi and welcome to fixya.

To answer your question;
From your description of the problem it sounds like your powered subwoofer has a power supply circuit problem.
It would be either with the large capacitors in the first stage of the supply(most likely) or with the regulation system that supplies +-15 volts to the preamp section.

If you are not familiar with electronic circuits you could still ask a repair shop to verify those large capacitors.

Hope this help and happy holidays.

Posted on Dec 06, 2010

Ad

Add Your Answer

×

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

0helpful
1answer

Fixing an humming subwoofer

Filter capacitors in the amplifier or a broken ground (shield) wire. Check if there is a ground lift switch in your system and try it in both on and lift positions.
0helpful
1answer

My 5.1home theater subwoofer giving more humming sound continues

Loud humming noise usually comes from a bad or missing ground connection, or a failed rectifier or filter capacitor in the power supply.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_29ad5d1dd86564b0

0helpful
1answer

Woofer is humming

Usually a faulty cable or blown speaker will cause a humming. If it is a constant humming I would surmise a faulty cable. On the other hand, if the humming comes and goes I would guess a faulty speaker.
0helpful
1answer

Subwoofer is hummig what is this noise

Hum is a constant low-frequency buzz, usually at about 60 Hz or 120 Hz, which results from voltage differences between true "ground" (what you'd get shoving a copper pipe into the ground) and the electrical "ground" of your receiver's chassis When this voltage differential exists, it's called a "ground loop," and the hum it produces is darned annoying. You'll hear the hum mainly from the subwoofer because it's a low-frequency noise, you will need a ground loop insulator they are about $20 at any electronic store
0helpful
1answer

How do I eliminate the humming on my Vizio VHT-510 system

see this instruction and fix it. God bless you

    • 1
      Disconnect the coaxial cable at the back of the satellite receiver or cable box by unscrewing the coupler on the cable end.

    • 2
      Attach the cable to the RF IN jack on a surge protector and tighten the coupler clockwise.


    • Sponsored Links

    • 3
      Connect a second coaxial cable from the RF OUT jack on the surge protector to the input on the cable box or satellite receiver. If this stops the hum, congratulations: You're done.

    • 4
      Unplug the subwoofer's electrical cord from the power strip or wall outlet if it is connected to the same circuit as the AV receiver. The amp in the AV receiver and the amp in the subwoofer are in conflict over the grounding of the electrical circuit.

    • 5
      Plug the subwoofer into its own surge protector and connect the surge protector to a different wall outlet than the AV receiver uses.

    • 6
      Disconnect the subwoofer cable from the back of the sub and the AV receiver if all other measures fail to stop the humming. Reverse the plug connections so the plug that had been connected to the receiver is now connected to the subwoofer. Turning the cable around may solve a problem known as ground-loop hum by reversing the shielding wire inside the cable.


Read more: http://www.ehow.com/how_6979184_eliminate-sound-home-theater-subwoofer.html#ixzz2ZdzrgBSa
0helpful
1answer

I have the coby 765, when i switch the buton to tv it is very loud even with the tv and dvd player turned completely down

Unfortunately the subwoofer should have a volume control knob, and the subwoofer for the DVD765 does not have this, that is why it is so loud, the only work around is to get an audio cable with a built in volume control knob.
0helpful
1answer

I have a loud humming sound coming from the speakers

. call bose customer service they can help you with some settings that will help. 877-210-3782. this is their home page http://www.bose.com/controller?url=/contact/index.jsp . you have any questions or this doesnt help let me know. -Derek
0helpful
1answer

I recently moved and am having trouble getting my phillips subwoofer system model : MMS171W hooked up properly There is a loud background hum when I attach it like I think it should be attached. Any ideas...

This is most likely a "ground loop" and is caused by using two different electrical outlets for the two parts of the system -- main receiver and subwoofer amp.

Try using the same electrical circuit (wall outlet) for all of the equipment in the home theater, using a power strip or strips as needed.
1helpful
1answer

My home theater speakers make a constant hum whenever my receiver is on. The loudness of the hum changes with the volume control, and goes away entirely when the system is muted. All components are plugged...

jd40,
Sounds like a grounding issue. The first two places to look into is the powered subwoofer and antenna. During your last test, did you leave the FM antenna and subwoofer connected? Many times the hum is directly related to the antenna and/or the subwoofer and to how they are grounded; creating a ground loop through the receivers ground on the outlet. If the antenna is grounded to the dwellings wiring, hum is inevitable and sometime you can get a ground loop hum from how or how & where the subwoofer is grounded. Try taking them completely out of the loop.

Also try taking it further back to the basics, start with the receiver plugged into a known good grounded outlet with no surge or line conditioner in the loop and nothing connected to the receiver, nothing. Use one speaker and different wire to test each speaker output while in tuner and any other mode but phono. With no signal, you will either get nothing (no hum or static) or just static in the tuner mode. No hum is a good sign. Some systems will mute the speakers if no signal is connected to eliminate the static from being produced through the speakers but a ground loop hum will most likely still be produced even in mute. If you get a hum when nothing is connected to the receiver, try looking into getting a better grounded outlet, even maybe to a different dwelling.

-Chris
0helpful
1answer

HUM noise at PSW3000 if i connect the Yamaha RX-V995

the conections some where are dirty you need to unplug everything clean all connections and the hum will go away
Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

227 views

Ask a Question

Usually answered in minutes!

Top Sony Audio Players & Recorders Experts

 Grubhead
Grubhead

Level 3 Expert

5720 Answers

The Knight
The Knight

Level 3 Expert

76823 Answers

 Francisco Mauricio...
Francisco Mauricio...

Level 3 Expert

1551 Answers

Are you a Sony Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...