hum trouble with mic pre

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Deepdark

Well-known member
Joined
May 19, 2013
Messages
1,321
Location
Quebec, Canada
hi guys

I recently build a access 312 for a friend, with the psu in the same case. when tested at my studio, it was clean and silent in term of hum, noise, in all channel. but at the studio of my friend, track 3 and 4 has a constent background hum. with gain at 0, the noise is there. I really don't understand what is going on. ground loop or bad electricity at my friend home? his other gear have not this trouble. do you guys have any ideas? here is the track I recorded at my home, near the computer and monitors, just to test in bad environnement and the signal is clean
 
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