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PC Sound very low/hums to TV

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Old 01-17-2005, 10:40 AM   #1
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Default PC Sound very low/hums to TV

Hi

I am using the sound output from my mobo integrated soundcard. The sound seems very low to the tv, a mits wd-62525

The headphone sound using the headphone jack in the pc is ok though.

My tv, standard inputs requires a tv sound level user setting of 17 or so. The pc requires this volume to be set to 28-34 to get the same sound volume, but at that volume, there is a definite hum/noise in the output.

Now the funny thing is that if I plug the headphones in right where the tv normally connects to the sound wire, there is no hum and the sound is nice and loud. To check for a bad sound input, I plugged the sound from the pc into another input in my tv, same, low sound and lots of hum, so it is not the input in the tv. Almost an impedance mismatch type of sound. Or a grounding issue?

So what do I adjust? I've got the sound control panel on the pc set to max volume, so that is not adjustable.

Can I use a preamp to force a bit more signal down the wire? Should I get an addon sound card? Will it be better?
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Old 01-28-2005, 07:48 PM   #2
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Open up the volume control and mute any unused inputs.
The line in on my sound card was the prob with mine.
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Old 01-28-2005, 08:41 PM   #3
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Also while you have the volume control open check for any low settings on the wave, CD audio, etc. If the source is low volume this will cause your symptom.


Just a bit of background so as to get some understanding of what's going on. Line level audio (the input to an amplifier or TV) is normalized for a signal level of 1volt. This is what your PC sound card will output with all of the level controls set to maximum. This will play your headphones or speakers very loud.

A simular problem occurs when people try to use the variable TV audio output as an source for their sound system. In order to get the 1 volt signal required to match the 1 volt signal their CD, tape deck, or tuner supplies, the TV volume control needs to be at or near the maximum setting. If the internal TV speakers are turned on, they will be way to loud. What many people try next is turning up the sound system to a good listening level. That works ok until they switch back to another source and find the system is blasting due to the high volume setting.

You can cut off the TV speakers on some sets, but that means you have to have the sound system turned on to view and hear the TV. So what we do for these instances is place an amp between the TV and the sound system to add some gain so the TV volume can be left at a lower level. This will allow the TV volume controll to vary both the TV speakers and the sound system and is not done very often.

In the case of the computer, you should be able to set all of the volume controls to maximum for the used sources and mute the unused sources like line in and mic in.
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Old 02-01-2005, 11:23 PM   #4
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ok, I solved the hum. My audio cable from the pc ran 50 ft over a florescent light in the basement, causing the hum.

I moved the pc into the theatre room. Now the hum is gone, but the sound is still very low.

Normal tv sound, dvd, vcr, etc plays at a level of 17-18 for my mits tv

The htpc comes in and sounds fine, but I need to set the level to 45-46 to get the same sound levels

The sound control panel is set to main volume max, all inputs except cd audio, and wave set to mute. Those two are set to max.

This is through the tv speakers.

Maybe all I need is a preamp, to get the sound from the pc to a higher level.

Anyone know where I can get a preamp for this? I've looked online and in Rat Shack. No luck!

Thanks!
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Old 02-02-2005, 06:46 AM   #5
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You could use a Radio Shack mixer Catalog #: 32-2057

or

Radio Shack SA-155 Integrated Stereo Mini Amplifier

The integrated amplifier would be my choice for your application. It is a bit less money than the mixer and it is smaller. It has RCA connections for the speaker outputs, so the hookup can be made with regular stereo patch cables. Even though it is an amplifier with enough power to drive small speakers, it will function as a preamp as well.
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Old 02-02-2005, 06:52 AM   #6
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Quote:
Originally Posted by rbinck
You could use a Radio Shack mixer Catalog #: 32-2057

or

Radio Shack SA-155 Integrated Stereo Mini Amplifier

The integrated amplifier would be my choice for your application. It is a bit less money than the mixer and it is smaller. It has RCA connections for the speaker outputs, so the hookup can be made with regular stereo patch cables. Even though it is an amplifier with enough power to drive small speakers, it will function as a preamp as well.

Wow. That is a good price for a mixer

So the mini amp, I plug the computer line out into it as a source, and the output speaker connections to the tv, then adjust its sound using the mini amp volume control, very slowly, until the sound levels matche? Got it?

Thanks!
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Old 02-02-2005, 02:45 PM   #7
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That's it.
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Old 02-03-2005, 11:49 AM   #8
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Quote:
Originally Posted by rbinck
You could use a Radio Shack mixer Catalog #: 32-2057

or

Radio Shack SA-155 Integrated Stereo Mini Amplifier

The integrated amplifier would be my choice for your application. It is a bit less money than the mixer and it is smaller. It has RCA connections for the speaker outputs, so the hookup can be made with regular stereo patch cables. Even though it is an amplifier with enough power to drive small speakers, it will function as a preamp as well.

Did some research, found the amp is hard to find.

My local store had one left, demo model. Got it for $9.61 including double warranty (since it was the demo unit).

Plugged it in (with 2 adapters I bought while there), and it works perfectly. I also could add bass/treble if I'd like

Phil
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Old 02-03-2005, 07:07 PM   #9
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Wow! You can't beat that deal. The adapters probably cost more than the amp! Lucky.
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