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#96741 - 07/10/17 01:06 PM Re: 975 - After about 1 month (positive / Negative) [Re: Adrian L]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2383
Loc: Columbus,North Carolina
The ground loop is likely due to a difference in the ground plane between your system and the Directv system. Try attaching a wire from the chassis of the Directv receiver to your 975 chassis. The coax from your satellite dish should have a ground wire which is attached to the ground at some point. If this ground is not the same as the one for your house a small voltage can be set up which makes the hum.
_________________________
Music system
Model 990/7500/Magnepan 1.6 QRs/Technics SL1200 MK2/Aperion S-12 Subwoofer/OWA3/Sony NS75H DVD
APC H15 Power Conditioner

TV System
Large Advent Loudspeakers/ Polk center/Monoprice surrounds/Panasonic Viera 42 inch/Onkyo HT-RC260/Sony BDP S590/Directv


Home Theater System
Onkyo PR-SC886/Outlaw 7125 Klipsch RF-82 L/R,RC-62 center, RB-35 SR/SL, BENQ HT1075, Outlaw LFM1-EX/OPPO BDP-83/Directv
Harmony ONE
Blue Jeans and Monoprice interconnects
APC H15 Power Conditioner

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#96742 - 07/10/17 04:11 PM Re: 975 - After about 1 month (positive / Negative) [Re: Adrian L]
975 destroyer Offline
Gunslinger

Registered: 09/07/15
Posts: 65
Loc: Georgia, US of A!
I "turned it* waaay down" by doin' what the DTV install tech said not to:
routing the DTV through my APC H15.
* the noise
_________________________
Samsung 60" UN60ES6100 LED
Outlaw Audio 975 Pre/Pro
Samsung BDP, Dennon LDP, Phillips CD chgr

Canare 14 ga - LCR tweeters inside; CC outside
BJC 10 ga - LCR mids, inside & out
8 ga Powerline - LR woofers, inside & out

LR: tri-amped Polk RTi A7 by 2 Rotel 98X & 2 P'sound HCA1000
CC: Rotel RB985 -> tri-amped Polk CSi A6
SWs: 3 Audio Pros - B1.39 & 2 Evidence*
Surrounds: Hafler XL280 -> Polk RTi A3** - each has its own sub*
Power Conditioning & Distribution:
3 dedicated 20A feeds; APC H15; 4 Furman MP-20s
** Bi-amped, Fall, 2017

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#96745 - 07/15/17 04:42 AM Re: 975 - After about 1 month (positive / Negative) [Re: Adrian L]
mtomer Offline
Deputy Gunslinger

Registered: 02/27/13
Posts: 5
Loc: PA
I also have a 975, and had a similar problem that was immensely frustrating. I tried a number of things, mostly focused on AC power and connections between the equipment. A ground loop isolator for the coax cable like the one above completely solved the problem - I highly recommend one, whether or not other solutions lessen the problem.

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#96746 - 07/15/17 05:34 AM Re: 975 - After about 1 month (positive / Negative) [Re: Adrian L]
975 destroyer Offline
Gunslinger

Registered: 09/07/15
Posts: 65
Loc: Georgia, US of A!
My apologies for de-railing this thread. Every coax isolation transformer I've seen advises against using w/sat TV. I plan to FIND the source of the problem - I know its in no way reflects on the 975 quality.
_________________________
Samsung 60" UN60ES6100 LED
Outlaw Audio 975 Pre/Pro
Samsung BDP, Dennon LDP, Phillips CD chgr

Canare 14 ga - LCR tweeters inside; CC outside
BJC 10 ga - LCR mids, inside & out
8 ga Powerline - LR woofers, inside & out

LR: tri-amped Polk RTi A7 by 2 Rotel 98X & 2 P'sound HCA1000
CC: Rotel RB985 -> tri-amped Polk CSi A6
SWs: 3 Audio Pros - B1.39 & 2 Evidence*
Surrounds: Hafler XL280 -> Polk RTi A3** - each has its own sub*
Power Conditioning & Distribution:
3 dedicated 20A feeds; APC H15; 4 Furman MP-20s
** Bi-amped, Fall, 2017

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#96750 - 07/17/17 10:21 AM Re: 975 - After about 1 month (positive / Negative) [Re: XenonMan]
Outlaw Ben Offline

Gunslinger

Registered: 10/31/13
Posts: 156
No worries. XenonMan is spot on; this is usually a difference in ground potential, and if you want to avoid an isolator, then you would want to:
Originally Posted By XenonMan
Try attaching a wire from the chassis of the Directv receiver to your 975 chassis.

If you have some thick speaker wire laying around, you can back off a chassis screw from each unit, wrap the speaker wire around it, and then tighten the chassis screws back down.

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#96902 - 09/20/17 07:39 PM Re: 975 - After about 1 month (positive / Negative) [Re: Adrian L]
JMCD Offline
Deputy Gunslinger

Registered: 01/03/02
Posts: 1
Loc: Columbus, OH USA
I have lived in several homes/townhomes where the ground difference was 6 mv or more and it is always the first thing I check. In my current house I had an issue and using a coax isolator did not solve the problem. I ended up using a 3 pin to 2 pin AC adapter on the AC for the TV. After unplugging and re-pluging each attached device, it was the Hitachi Plasma that made the difference. Since both cable and internet are coming on the same cable and I had a HTPC attached to the TV directly, I suspect I was getting a ground loop via the PC and its network attachment back through to the cable system.

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