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Output Noise question
Output Noise question
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Old 20th August 2007, 10:19 AM   #1
ianc13 is offline ianc13  United Kingdom
diyAudio Member
Join Date: Oct 2005
Default Output Noise question


I was wondering whether someone could give me some guidance - I am testing the first of my C3G/PX25 DRD monoblocks and currently have around 2.5-3.0 mV of hum on the output.

This level I can hear through my speakers from my sitting position.

There are a number of bits and pieces that I still need to implement in this monoblock, like screening the input wire and sorting out the star ground for the CLCLC supply.

The question that I have is what is a suitable noise level to aim for? 1.0mV? My speakers are around 97db/M.

Thanks in advance, Ian
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Old 20th August 2007, 10:33 AM   #2
AndreasS is offline AndreasS  Germany
diyAudio Member
Join Date: May 2005
Location: near Duesseldorf
Hi Ian,

Take a signal with 100 Hz to your loudspeaker terminals and decrease the signal to the level of your choice...

Regards Andreas
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Old 20th August 2007, 10:48 AM   #3
ianc13 is offline ianc13  United Kingdom
diyAudio Member
Join Date: Oct 2005
Thanks Andreas,

I never even thought of that

Should be quite easy to test.

Thanks again,

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