HUM with M60 Mk2.2 and Avantgarde Uno

OTL Asylum

OTL, Output Transformerless Amplifier User Group.

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Hello everybody, I need some advice on reducing the very annoying hum coming from my new pair of Avantgarde Uno connected to a pair of M60 Mk2.2. monoblocks. These are connected to a MP3 preamp through balanced connection.
Hum is present even with the pre switched off.
I know it could be some nasty ground loop, and I tried then disconnecting the ground pin in the preamp power cord, and the ground pins in the subwoofers cords as well. No result in both cases, hum is still present.
There is more then a ground loop? Maybe an â€œintrinsicâ€ hum (and some hiss too) in the M60s? Too much gain? I remember someone in the old board reporting his great experience with the same combo. Anybody else has had similar experiences with high efficiency speakers and A-S OTLs?
Any help would be greatly welcome.
Cheers,
Serge

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Topic - HUM with M60 Mk2.2 and Avantgarde Uno - audiophile2005 03:56:17 04/25/05 (4)

Re: HUM with M60 Mk2.2 and Avantgarde Uno - Ralph 12:39:24 04/25/05 (1)

Re: HUM with M60 Mk2.2 and Avantgarde Uno - audiophile2005 14:05:40 04/25/05 (0)

Re: HUM with M60 Mk2.2 and Avantgarde Uno - acres verde 07:49:13 04/25/05 (1)

Atma-sphere M60 Mk2.2 and Avantgarde DUO - oracle 17:21:07 05/22/05 (0)

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