miniDSP/miniDIGI/miniAMP noise problem - diyAudio
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Old 26th September 2013, 09:01 PM   #1
Defo is offline Defo  Norway
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Join Date: Nov 2008
Default miniDSP/miniDIGI/miniAMP noise problem

Hello,

Since I don't recieve any response from miniDSP support, I'll try here..

Two problems:

- High noise in speakers connected to the miniAMP. Noise is redused considerably when miniDSP is distached from the setup (ie. running only the miniDIGI and miniAMP).
When powering up the whole module, the noise is at an acceptable level, but as soon as an audio signal is present, the noise is elevated to a much higher level, and stays so until I power down the module again. I use the optical input on the miniDIGI.

- Volume potentiometer not working as it should (volume is high, even though the potentiometer is turned all the way down, in which case it should be completely silent).

Pictures of each board attached.

Help please?
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Old 26th September 2013, 09:37 PM   #2
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Join Date: Sep 2008
Location: Bristol
one little thing to note, the volume potentiometer never goes to zero. Volume should be controlled before or after. Bit stupid design.

I just got my dsp/digi/amp working, whats your power source?
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Old 26th September 2013, 09:48 PM   #3
Defo is offline Defo  Norway
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Join Date: Nov 2008
Thanks for the reply.

I've tried several different power supplies, so it doesn't seem to be an issue with the power adapter. The noise is still quite high.

The miniAMP is connected to a pair of horns with compression drivers, so some noise is to be expected. But I experenced less noise with other amplifiers that inhibited quite low s/n ratios, so I would expect the miniAMP more or less silent due to its pure digital design.

While it does seem to be more of an issue with the miniDSP rather then the miniAMP, since the noise is only present when an audio signal is present (that is, I start playing some music). Before that, the noise is quite low.
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Old 27th September 2013, 07:48 PM   #4
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Join Date: Apr 2012
If it is the MiniDSP volume, check out this guide:

Potentiometer Volume control down to -100dB

MiniDSP :: Topic: Potentiometer Volume control down to -100dB (1/1)
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