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I have a simple hook up, yet encountering hum when I connect the dac direct to amp. I tried changing source, psu, amp without avail. I run a twisted pair of cat5 for the spdif (unshielded), length approx 30cm, could this digital link cause humming? Any advise would be appreciated. Thanks Edited by user Tuesday, February 8, 2011 9:34:51 AM(UTC)
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Will need some more information about your setup and wiring to help. (Pictures help greatly)
Usually, hum is related to a ground loop somewhere in the system, so we will need to know how you have the power supply(s), Buffalo and amp wires specifically.
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Hi Brian,
I managed to isolate the problem, as mentioned previously I had changed the psu without avail, and when I disconnect the SPDIF, the hum was gone, hence I could determine it is related to my CDP. Thanks for the pointer and general direction.
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Just to update on my previous posting, I tried swapping a different power supply for the B-II, that help to reduce the hum a fair bit, but hum still persist in the background. I have connected all the equipment behind a single isolation transformer and that didnt help in resolving the hum. All the equipment are 2 pin except the amp. When I connect B-II to different power supplies/direct to the mains or via the Isolation transformer - the hum varies with different harmonic textures :( What should be the best practice for connecting B-II in view of reduced hum? a) grounded or floating power supply? b) necessity of using shielded DC cable? if so, where to terminate the ground for floating power supply? c) interconnector - I am using Belden 1530A 75R cable with single shield. Should I use double shielding? If so, which end is the grounding (which usually is the receiver) - where to ground in B-II? Thanks. Edited by user Monday, February 21, 2011 10:04:37 AM(UTC)
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The is nothing in particular with the B-II regarding hum that is any different than any other piece of audio gear. You just have to track down your ground loop. Actually when used balanced out Buffalo/IVY or Legato is especially nearly immune to any sort of hum at all. You would have to have a sever issue to pick up any.
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I guess the normal arrangeent is to ground the case but not connect the power supply ground to network ground.
Cheers
thomas
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I managed to resolve the hum issue by connecting to GND instead of OUT-. Guess the issue is not always caused by source, power, routing.
However, the initial awesome organic sound that I heard abeit with the hum is now leaner and becomes ordinary.
Is there anyway I can use the OUT- rail when the transformer has only SE lead? Thanks.
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