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Static noise help please

Recently just notice Static, hiss, popping sound(I don’t think I hear that before but I might be wrong) from both speakers when volume alway down with music off. Happen only when connected usb from iMac to Schitt Modi 2 Uber DAC. Static noise disappear after unplug either end of the usb. I am using temporally cheap 15 feet usb a/b cable. Pre amp is ARC LS7,ARC VS60 amp,and Sonus Faber Venere 2.5.  Any advise?
I swap from ARC setup above to Cary SLI80 interested amp and used the same usb cable and the static noise was gone. So I think it is not the usb cable problem. Is that possible static noise come from tubes?

Regards,
Eddy

eddy1
eddy1 OP
148 posts
 
Somehow static just disappear.  
ghosthouse's avatar
ghosthouse
4,321 posts
 
Eddy - haven't experienced what I consider "static" from tubes but definitely a few random pops soon after start up that eventually turned into tube failure... an EL34 power tube.  Static to me is a more prolonged sound, sort of a rapid, lower volume crackling.  I'm wondering if it could be due to a dirty or loose connection that got "fixed" when you changed out gear.  Have you returned the ARC gear to service and is the static noise still gone?  Good luck.  
eddy1 OP
148 posts
 
ghosthouse, Thank you for you responded.  The static noise is still there.  Windows were opened so I couldn't hear static at that time but after all windows closed I heard static noise again.  Did some search on Schitt Modi and found some people having the same problem.  Yes, it is low volume cracking noise and continue making same noise until I unplug usb cable.  Will not hear static noise when I play the music.   I will have to check with my Cary SLI80 again if it make noise like ARC to make sure.  This Modi is only $150, it might be too cheap that's why I having this problem.  I was going to spend $1,200-1,500 on DAC but something came up and need to use those money so I just pickup the Modi for temporary for couple of months and now I am afraid to buy Schiit Gungnir Multibit, might try different brand.  
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