My 5000 has recently been exhibiting a low hum that is especially noticeable when the system is powered off and the amplifier is in standby mode. The amp is connected to a Model 976 and power is triggered from the pre.

The hum sounds like a 60-cycle hum but the power cord does not include a ground pin, so attempting to isolate the ground is not possible.

Thoughts? Anyone else seen this?
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[5.1ch]
Outlaw Model 976
Outlaw Model 5000
SVS Speakers
SVS Sub

[2ch]
McIntosh C2500
McIntosh MC162
Sonus Faber Bookshelfs