Question about Panasonic SC-HT720 System

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No power! All plugs are plugged in and secure. System cable is connected securely, power cable is securely connected. Plugged in, the Subwoofer turns on but the main unit has no power. It was working an hour before.

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Re: No power!

Every thing is working the system and the subwoofer my problem is the center and surround speakers are not working 

Posted on Oct 15, 2008

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How do i conect supwofer out put ?

You need a mono RCA subwoofer cable (

Down where the speakers hook up to the rear of the unit there is a subwoofer output RCA connection. Plug RCA cable in there and run it to the Input of the powered subwoofer.

Mar 01, 2015 | Sharp CD-DVD500 System

1 Answer

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.

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    • 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:

Jul 20, 2013 | Vizio Vht210 2.1 Home Theater Soundbar...

1 Answer

Can i put an extra sub woofer on my lg da3525 via the woofer out socket and what plug do i require to do this


How to Connect 2 Subwoofers to One Receiver

Subwoofers produce the deep bass sounds that give home theater the realism of being at the movies. A good subwoofer can rattle the walls during action sequences, while adding depth to recorded music and a heightened sense of feeling in the midst of a televised sporting event. Because most home theater receivers are equipped with a single subwoofer jack, connecting a second subwoofer requires a simple audio adapter available at electronics stores. Self-powered subwoofers have their own built-in amplifiers to drive the bass speakers, so they cannot drain power on the main receiver in a system and thus pose no danger to the equipment, even when an extra subwoofer is connected.

Things You'll Need:

Home theater receiver
Y-adapter with RCA jacks on two ends and an RCA plug on the other, available at electronics stores.
2 RCA subwoofer cables
2 subwoofers


Plug the Y-adapter into the home theater receiver's "Subwoofer OUT" jack.

Connect an RCA subwoofer cable to each jack on the Y adapter and route the cables to the subwoofers in the room. Because subwoofers deliver an omnidirectional sound, the boxes can be placed anywhere they won't get in the way, but within reach of an electrical outlet..

Plug an RCA cable into the "Sub IN" jack on the back of each subwoofer.

Connect the subwoofers to wall outlets and turn on each unit by pressing the power button, typically located on the back panel.

Adjust the volume and crossover settings on each subwoofer as desired. The crossover adjustment knob tells the subwppfer which low-end frequencies to reproduce from the audio signal, such as a movie on DVD. All frequencies higher than the crossover setting will be transferred to the other speakers connected to the receiver.

Tips & Warnings

Use subwoofers that are closely matched in power, as rated in watts, when using two subwoofers in a home theater setup.

Disconnect the subwoofers from the power supply while making the audio connections.

Have a nice day...

Feb 19, 2011 | LG DA-3525 Theater System

1 Answer

I have an rt2870 and am just wondering where i connect the yellow subwoofer cord to the TV at, and i set my tv setting for the surround sound

You shouldn't connect the subwoofer to the TV. Just connect the Right and Left audio cables (red and white RCA plugs) to the TV audio out and then the other side goes receiver's audio in. If you are using the subwoofer that came with the unit, connect it to the sub port (purple and grey or black striped). The red and black striped cable goes to the subwoofer control.

If you are using another active subwoofer, connect it to the RCA jack labeled Subwoofer Audio OUT.

If you have a 3-plug RCA cable that is a composite video cable. The yellow plug carries the video, the red and white carry the audio signal. This cable is most often used for connecting older VCRs and game systems to a TV (or newer devices to an older TV). Thus leave the yellow jack dangling if using it for an audio cable.

Set your TV to use the external audio speakers and the receiver will take care of the signal to the subwoofer. (You only would connect the speakers individually for a computer sound system.)

I hope this helps.

Cindy Wells

Sep 19, 2010 | RCA RT2870 Theater System

1 Answer

I have an Onkyo SKW-50 subwoofer and when I turn on the power to the subwoofer, it is making a low-level humming sound. When I turn the frequency dial up or down, the sound of the hum gets louder or softer...

may be u have a power problem check if ur ground is well connected to ur amplifer and also check the input cables if there ground wires r intact and make good contact

Dec 20, 2009 | Home Theater Systems

1 Answer

I have a subwoofer with standard speaker wire connection, how to I attach to a receiver with a subwoofer cable?

The Subwoofer is Likely Passive....meaning no amplifier is within the enclosure itself....the incompatible connectors mean you cannot connect the subwoofer itself to your surround sound system.

look for a Suitable stand-alone (1 Channel) Amplifer with sufficent power.....connect the RCA Imputs (subwoofer cable) to the Recievers RCA subwoofer output....then connect the amplifier's output to the the wire going into the subwoofer enclosure....if there is a plastic connector simply cut it off and strip the wires down a sufficent lenght....then secure the wires to the output of the amplifier.

if you do this make sure you know the ohm rating of the subwoofer and the minimum ohm rating of the amplifier your using.

Nov 24, 2009 | Sony BRAVIA DAV-HDX267W Theater System...

1 Answer

Can not get any sound to work on my bose 28 life style system first time using it. and got a new tv

If you have no sound from any source (CDs and radio included) then check the Audio Input cable at the back of the media center. Make sure it's plugged into the top portion of the 'speakers' section into where it says "main" and not "BoseLink"
If this is fully connected, but still no audio- check to make sure your Acoustimass module (subwoofer on the floor) is plugged into a working power outlet. If that fails, try unplugging both power cords for the system for about 30 seconds.

May 31, 2009 | Bose Lifestyle 28 System

1 Answer

Power issues: will not turn off or function

Unplug all of the speakers and power on.Its possible that one of the speakers is causing the protection circuit to activate.If powered on and subwoofer works start reconnecting one speaker at a time( after powered off) and retest each time.One Speaker may be bad.Its also possible the output ic is failing under a speaker load.There are no fuses related to this issue.If its not a speaker problem then the subwoofer will need to be serviced.

Feb 24, 2008 | Panasonic SC-HT730 System

1 Answer

No power!

okay, this seems like either the fuse hase blown in the actual mains plug, or the mass fuse inside the device, it looks like this very small glass fuse, same size as an ordinary fuse, its just seethrough. see if you can get a replacement for it, you may need 2 open the unit to check if it has blown, it will be black or a "burnt" colour from inside! if you dont want to open it, take it to any electronics store, they are bound to check for you, but these fuses don't cost more that $1 or 50pence!

hope this helps

Dec 22, 2007 | Panasonic SC-HT730 System

1 Answer

No Power

I just recently moved back home to NY and hen I plugged in my subwoofer I have no power

Oct 21, 2007 | JVC TH-C3 System

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