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Old 15th June 2009, 11:19 PM   #1
kenny12 is offline kenny12  Australia
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Default amp with very low ground noise

Hi, im going to need an amp for my desktop speakers, a pair of JBL Monitor 4200, which is an 8ohm load.


I've currently got a digitech amp thats based on a TDA7294 chip, its really noisy when no music is playing. I'm planning on ripping out all the eq bits and just use it as a power amp.

I'm considering placing a whole new amp board in there, what designs have pretty much no noise when no music is playing?

The speakers will be about half a meter from my ears.
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Old 16th June 2009, 04:52 AM   #2
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Default amp with very low ground noise

Why don't you go up to Greg ball's site, and either buy the boards, or the assembled boards, or the whole kit for his amplifier. Go to www.ska-audio.com. Done right, it is a killer amp, and it's dead quiet. He separates the grounds.

Ray Bronk
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Old 16th June 2009, 05:43 AM   #3
kenny12 is offline kenny12  Australia
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i'm working with a budget of about 200AUD for everything
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Old 16th June 2009, 06:27 AM   #4
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Rip out all the eq parts and see, where that gets you. The TDA7294 is not noisy on its own.
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Old 16th June 2009, 06:38 AM   #5
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Hi, Well I would suggest you buy the PCBoards, and then work on getting the parts together yourself. This amp is really a killer, and when done right, it is dead quiet. Trust me on this one, it's worth the build. He had two amps, and one more on the way. I've have mine for awhile now, and I love it a lot. I got the smaller version/lower wattage version. I don't want to sound to much like a commercial, but just go check it out.

Ray Bronk
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Old 16th June 2009, 06:49 AM   #6
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Most amps have very little noise if they are designed properly. Can't see the problem.
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Old 16th June 2009, 07:36 AM   #7
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Default Re: amp with very low ground noise

Quote:
Originally posted by kenny12
....its really noisy when no music is playing....
This could be normal depending on how you're utilizing your setup.

Is the volume on the amp all the way up when this happens and are you using the PC as the volume control? Is the noise still there if you turn the volume of the amp all the way down?

If the amp has fairly high gain and you are in fact using the PC as the volume control, then the amp is just amplifying the noise floor of your PC's sound output.

Solution: Don't use the PC as the volume control.
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Old 16th June 2009, 08:03 AM   #8
Ted205 is offline Ted205  United Kingdom
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my guess is the noise is generated by the computer not the amp. You would be better off running a dac before the amp



try the amp with another source.
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Old 16th June 2009, 08:40 AM   #9
kenny12 is offline kenny12  Australia
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its not the soundcard, i've got a headphone amp with no noise, I'll rip out all the eq first and take it from there,
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Old 16th June 2009, 09:10 AM   #10
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Quote:
Originally posted by kenny12
its not the soundcard, i've got a headphone amp with no noise, I'll rip out all the eq first and take it from there,
Most headphone amps have much lower gain compared to a power amp.

You didn't answer the question as to how you are controlling the volume.
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