EXS 24 Logic Sampler Users Group

Hello,

I am having a ground hum problem with my Audiowerk 8 and Audiowerk 
cards.  We've lifted all grounds from all equipment with 3 prong 
adaptors, removed all other imputs from our Mackie 1604 VLZ Pro 
mixer, and have determined that the audio cards are causing the hum. 
We've tried different cables, swapped the Audiowerk 8 out for the 
Audiowerk 2, and the hum always comes from the sound cards.  When we 
disconnect the card's RCA cables from the mixer, the hum stops.

Has anybody had any similar experieinces with this problem?
Any suggestions, solutions.

Thanks,
David Benus

>Hello,
>
>I am having a ground hum problem with my Audiowerk 8 and Audiowerk
>cards.

I seem to remember a thread on this on the main LUG when the cards 
first came out, and the solution had something to do with internal 
grounding in the Mac.  You are using the screws to connect it to the 
chassis, are you?  I dredged this up from years ago.  Regards Brian

  At the bottom of the card is a point at which the shielding meets 
the metal frame which is attached to the front of the card. Now the 
bottom of this metal frame was slightly bent away from the card and 
was not making contact with the shielding. I bent the frame back so 
it was making contact and put the card back in the Mac......No Noise! 
Once again if I turn my gains to max then I can hear a little 
rubbish, but if there was actual signal present at this level my 
speaker cones would travel across the room. At normal levels it's 
totally quiet.


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