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Noise in Speakers: Hum (1 Viewer)

Jon_Durham

Grip
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Jan 25, 2003
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When I connect my Hitachi 57wux20b to my stereo a temendous hum emits from my stereo speakers. I had the same problem with my 29" Hitachi and the only way I could over come this problem on the old TV was to turn off the internal speakers and connect the stereo via the external speaker connection.

Here's my equipment:

Dynaco Preamp
Dynaco Amp by Van Alsine
Dynaco Passive Home Theater
Equalizer between preamp and amp
Sony CD Player
Harman Kardon Tape Player
DBX unit
 

Cees Alons

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Jon,

A "tremendous" hum signals a missing ground connection in the audio signal. How exactly do you connect your Hitachi to your stereo? What outputs/inputs do you connect and with what? What is your "stereo", BTW? Are your TV and your stereo set on the same power outlet (or at least close)?

Cees
 

Lee Carbray

Second Unit
Joined
Oct 23, 2002
Messages
308
the only way I could over come this problem on the old TV was to turn off the internal speakers and connect the stereo via the external speaker connection.
If you are connecting the TV to your home theater why would you leave the TV's speakers on? And as Cees asked how would you hook up your TV other then the audio out on the tv to an audio in on your "stereo"?
 

Jon_Durham

Grip
Joined
Jan 25, 2003
Messages
18
A "tremendous" hum signals a missing ground connection in the audio signal. How exactly do you connect your Hitachi to your stereo? What outputs/inputs do you connect and with what? What is your "stereo", BTW? Are your TV and your stereo set on the same power outlet (or at least close)?

Cees

Hi Cees

The only reason to leave the TV speakers on would be to use them as a center speaker.

Back to my problem: Hitachi connects to the preamp via RCA cables. So does my CD player, tape player, equalizer (see below), DBX unit, and FM tuner. Stereo and Hitachi are on two separate outlets that are a few feet apart. Output from the preamp goes through the equalizer to the amp.
 

Cees Alons

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Jon,

(Trying to get the picture). So all is right until you plug in the TV connection and then HUM? Are you sure (sorry for asking) to connect a regular Stereo-Out from your TV to the receiver input? How do you use your TV speakers as nothing more than a center speaker?

Again: sorry for asking all these questions, but the problem does sound very interesting and challenging!

Cees
 

Lee Carbray

Second Unit
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Oct 23, 2002
Messages
308
To use the TV as a centre speaker wouldn't the TV be hooked up from an audio out(high level usually) from the receiver to an input on the TV? And it would have to be set up in the TV's audio menu to be a centre speaker. Are we sure that this TV supports this. I could not find it on there web site(or anywhere on the net for that matter).
 

Ted Lee

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May 8, 2001
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8,390
do you have cable tv?

try hooking everything up like normal, then disconnect the cable co-ax feed (for your tv) from the wall. you might be getting a ground-loop hum.

the fact that everything works until you hook up the tv makes me think this.

if that is the problem, read this thread. it has some info on some parts you can get from rat-shack that may work to solve your problem.
 

Jon_Durham

Grip
Joined
Jan 25, 2003
Messages
18
(Trying to get the picture). So all is right until you plug in the TV connection and then HUM? Are you sure (sorry for asking) to connect a regular Stereo-Out from your TV to the receiver input? How do you use your TV speakers as nothing more than a center speaker?

Cees,

Yep, hum goes away when I disconnect the RCA cable from the TV and am using the output audio on the TV.

Haven't bothered much with the TV speakers other than shutting them down to see if hum goes away. Shutting them down has no effect.

I have disconnected the coaxial cable and hum is still there.

My thinking is the TV and audio equipment are not on the same ground.
 

Cees Alons

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Is it possible to use the same power outlet (with the same ground) for your stereo and your TV (even if it's just once, for testing purposes)? And did you also try another RCA cable (the cable just might be broken or so)?

Cees
 

Jon_Durham

Grip
Joined
Jan 25, 2003
Messages
18
I unhooked everything and the begun to plug in devices. Viola, no hum with all devices in the circiut EXCEPT the SURGE PROTECT for the cable.
 

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