- Joined
- Oct 3, 2019
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Hi everyone,
Thanks in no small part to advice here, I am now set up with digital RIAA. The rig is sounding excellent and far quieter than with analogue RIAA, but I’m wondering if it could be better. I am noticing a pronounced hum if I turn up the volume with no music playing. An analyser tells me this is at around 50Hz so I’m guessing it’s a mains ground loop. My experiments suggest it’s possible to remove, and I’m hoping someone here will have a practical way to do this.
My setup is:
Turntable + MC cart
AEA TRP mic pre
RME ADI-2 Pro
Mac mini with digital RIAA
I’ve traced the hum to the mic pre. To do this I disconnected the turntable leads from the mic pre. I muted one channel. On the other channel I plugged in a spare XLR cable with no plug on the other end and twisted the bare signal cables together. This revealed the same noise profile, with the 50Hz hum, as when the turntable was connected. What was odd was that when I accidentally touched the twisted ends on the mic pre’s metal case, the hum almost entirely disappeared.
What does this mean? Is there a way I could achieve this same effect with the turntable connected?
Any suggestions gratefully received.
Thanks,
James
Thanks in no small part to advice here, I am now set up with digital RIAA. The rig is sounding excellent and far quieter than with analogue RIAA, but I’m wondering if it could be better. I am noticing a pronounced hum if I turn up the volume with no music playing. An analyser tells me this is at around 50Hz so I’m guessing it’s a mains ground loop. My experiments suggest it’s possible to remove, and I’m hoping someone here will have a practical way to do this.
My setup is:
Turntable + MC cart
AEA TRP mic pre
RME ADI-2 Pro
Mac mini with digital RIAA
I’ve traced the hum to the mic pre. To do this I disconnected the turntable leads from the mic pre. I muted one channel. On the other channel I plugged in a spare XLR cable with no plug on the other end and twisted the bare signal cables together. This revealed the same noise profile, with the 50Hz hum, as when the turntable was connected. What was odd was that when I accidentally touched the twisted ends on the mic pre’s metal case, the hum almost entirely disappeared.
What does this mean? Is there a way I could achieve this same effect with the turntable connected?
Any suggestions gratefully received.
Thanks,
James