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Ground loop hum

Just installed my Anthem MRX300 with PVA5 and have a hum . When I remove the Sunfire mark 2 the hum thru the speakers disappears. When I take the Sunfire to my friends Emotiva set up there is no hum thru his Martin loagans. When I replace the sunfire with an Energy there is not hum. Previously with the Marantz Sr19 there was no hum thru the speakers either. All else remains the same. Any guidance?
Brian
brianvportugal
marakanetz's avatar
marakanetz
5,473 posts
 
Check the ground fault on your outlets. As far as I know Sunfire uses tricy power chord where ground plug isn't used. If you have a ground fault it's gonna hum for sure.
Even if there's a ground fault, if I use my Sunfire SRA via power conditioner, it's no hum at all.
brianvportugal OP
21 posts
 
Thank you both I'll try the sat tonight.

Marakanetz which power conditioner do you use?
Brian
marakanetz's avatar
marakanetz
5,473 posts
 
I use old Panamax Max1500. I bought it for $150 new almost 10 years ago.
chadnliz
3,736 posts
 
I use a Monster but not sure if I need it.
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dbphd
1,628 posts
 
Chad,

I often disagree with your advice, but I think you may have hit the nail on the head this time. Since DirecTV installed Whole Home, connecting the receivers to our LAN, a noticeable hum was introduced to what had been a silent system. I thought the unit they attached to the receiver might be too close to something, but perhaps it needs to be grounded. I'll follow up on your advice. Thanks.

db
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