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#91924 - 12/03/12 09:34 PM Re: Dreaded ground loop noise? [Re: XenonMan]
cp1966 Offline
Gunslinger

Registered: 04/20/07
Posts: 221
Loc: Minneapolis
Only a set of component (red, green, blue video and L & R audio cables from a Wii) whicg I believe Jim had said would not affect any noise.

I will be sure to unplug those as well in the morning and try it again.

I also currently have the TV power cord (3 prong) connected to the outlet directly, bypassing the monster Power 1200.
_________________________
Panasonic TC-P65S1 65" Plasma HDTV, Marantz AV 8801 Preamp, Outlaw 7700 Amp, Klipsch RF7 (X-over dean G modded) RC7 (X-over Dean G modded) RS7 CDT-5800C speakers, Outlaw LFM1 EX Subwoofer, Oppo BDP-93, B & O Turntable, Toshiba HD-A2, Sony CD & DVD 400 disc jukeboxes, DirecTV HD-DVR, PS2, PS3, Wii, Harmony one remote, Monster PowerBar 1200 for the TV, sub, PS3, HD DVD and Wii, Tripp Lite Isolation Bar for the Amp, Pre-Amp and other sources.

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#91926 - 12/03/12 11:38 PM Re: Dreaded ground loop noise? [Re: cp1966]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2676
Loc: Columbus,North Carolina
Unplug everything from your TV. Even if it is only video it still has a ground somewhere. Disconnect the Wii and the power cord from the TV and see if the noise is gone. If it is then plug in the TV to the wall and check again, then do the same with the wii.
_________________________
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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#91927 - 12/04/12 01:22 AM Re: Dreaded ground loop noise? [Re: XenonMan]
cp1966 Offline
Gunslinger

Registered: 04/20/07
Posts: 221
Loc: Minneapolis
Originally Posted By: XenonMan
Unplug everything from your TV. Even if it is only video it still has a ground somewhere. Disconnect the Wii and the power cord from the TV and see if the noise is gone. If it is then plug in the TV to the wall and check again, then do the same with the wii.


Will do, but I think I did this in my earlier troubleshooting escapades....
_________________________
Panasonic TC-P65S1 65" Plasma HDTV, Marantz AV 8801 Preamp, Outlaw 7700 Amp, Klipsch RF7 (X-over dean G modded) RC7 (X-over Dean G modded) RS7 CDT-5800C speakers, Outlaw LFM1 EX Subwoofer, Oppo BDP-93, B & O Turntable, Toshiba HD-A2, Sony CD & DVD 400 disc jukeboxes, DirecTV HD-DVR, PS2, PS3, Wii, Harmony one remote, Monster PowerBar 1200 for the TV, sub, PS3, HD DVD and Wii, Tripp Lite Isolation Bar for the Amp, Pre-Amp and other sources.

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#91928 - 12/04/12 02:39 AM Re: Dreaded ground loop noise? [Re: cp1966]
cp1966 Offline
Gunslinger

Registered: 04/20/07
Posts: 221
Loc: Minneapolis
More info;

Outlaw 7700 amp, 3 prong plug
Marantz 7005 preamp, 2 prong plug
Panasonic Plasma HDTV, 3 prong plug

I wired a 14 guage wire from the preamp (ground scew) to the amp (screw on top front) to insure a ground. I tried running that wire right to a water pipe, and even though the DirecTv line is grounded right after it enters the house and prior to it feeding a 4x8 mulitiswitch, I grounded it again onto a water pipe above the stereo cabinet.

None of this helped.
_________________________
Panasonic TC-P65S1 65" Plasma HDTV, Marantz AV 8801 Preamp, Outlaw 7700 Amp, Klipsch RF7 (X-over dean G modded) RC7 (X-over Dean G modded) RS7 CDT-5800C speakers, Outlaw LFM1 EX Subwoofer, Oppo BDP-93, B & O Turntable, Toshiba HD-A2, Sony CD & DVD 400 disc jukeboxes, DirecTV HD-DVR, PS2, PS3, Wii, Harmony one remote, Monster PowerBar 1200 for the TV, sub, PS3, HD DVD and Wii, Tripp Lite Isolation Bar for the Amp, Pre-Amp and other sources.

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#91930 - 12/04/12 03:20 PM Re: Dreaded ground loop noise? [Re: cp1966]
cp1966 Offline
Gunslinger

Registered: 04/20/07
Posts: 221
Loc: Minneapolis
I just double checked the connections at the plasma;

Nothing plugged into the plasma and plugged into the wall = no buzz
Only the 1 HDMI cable plugged into the plasma w/o it plugged into the wall = no buzz
Plug the plasma into the wall w/o turning the plasma on = buzz

This was done with everything else plugged into the Marantz 7005 (4 HDMI in, 1 out, plus 2 optical cables, and 8 RCA cables from my Oppo into the 7.1 input).

Suggestions?
_________________________
Panasonic TC-P65S1 65" Plasma HDTV, Marantz AV 8801 Preamp, Outlaw 7700 Amp, Klipsch RF7 (X-over dean G modded) RC7 (X-over Dean G modded) RS7 CDT-5800C speakers, Outlaw LFM1 EX Subwoofer, Oppo BDP-93, B & O Turntable, Toshiba HD-A2, Sony CD & DVD 400 disc jukeboxes, DirecTV HD-DVR, PS2, PS3, Wii, Harmony one remote, Monster PowerBar 1200 for the TV, sub, PS3, HD DVD and Wii, Tripp Lite Isolation Bar for the Amp, Pre-Amp and other sources.

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#91931 - 12/04/12 04:32 PM Re: Dreaded ground loop noise? [Re: cp1966]
jmacari Offline
Gunslinger

Registered: 12/28/05
Posts: 99
Loc: Rhode Island
Quote:
Plug the plasma into the wall w/o turning the plasma on = buzz

Quote:
Suggestions?


..Sounds like it is coming from Plasma....can you switch in another TV/Monitor, then try?? or Maybe, isolate outlet for Plasma plug???Or even try running an extension cord from other section of house to Plasma plug....
_________________________
Anthem MRX-500/ Outlaw 7500, Paradigm Studio 100's Fronts, Paradigm CC-590 Center, Phase Technology Dipole rears , Martin Logan Dynamo sub, Oppo BDP-103, DIRECTV H22-200 DVR HD receiver, Samsung PN60E8000 3D Plasma 60"
2nd System
B&K ST 202 Amp, Outlaw 990, Rotel RCD 1072CD, Yaqin CD 1 Tube Buffer, Apogee Centaur Minors, Phase Technology Model 10 Sub, Rotel RP-855 turntable, Panasonic DMP-BD30, DIRECTV H21-700 DVR HD receiver, Free Agent Home Theatre+, Vizio 40" LED

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#91932 - 12/04/12 05:55 PM Re: Dreaded ground loop noise? [Re: jmacari]
EEman Offline
Desperado

Registered: 11/11/09
Posts: 514
Loc: Canton, MI
cp1966, this is truly some great detectve work on your part. Ground loops are the worst.

For a test you can try one of THESE. For the test do not connect the ground lug.

If the noise goes away then the safety ground is the cause of the problem. It's strange that you are having this problem even though you are using a power conditioner. Maybe the Saftey Ground (third wire) in you outlet box is floating/not connected or else something is funky in wiring of the TV?

If this doesn't solve the problem then I'd question if the outlet is wired correctly or somehow sustained damage.

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#91933 - 12/04/12 06:08 PM Re: Dreaded ground loop noise? [Re: EEman]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2676
Loc: Columbus,North Carolina
It is likely that even when the TV is off it is still trying to keep some components warm to aid in quicker startup. Maybe the TV is causing the interference directly. Try to run the TV as suggested above with the ground pin bypassed.
_________________________
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

Top
#91934 - 12/04/12 08:22 PM Re: Dreaded ground loop noise? [Re: XenonMan]
cp1966 Offline
Gunslinger

Registered: 04/20/07
Posts: 221
Loc: Minneapolis
I have tested the outlets and they are ok, and grounded correctly. I haved checked all the wire connections in my electrical panel, all tight. All speaker and XLR cables are nice n tight frown

I have hooked up the hdmi cable to another TV (32" LCD) in another room, and there is still a little noise but not as much as with the 65" plasma.

Should I try the cheater plug on both the plasma and the outlaw 7700 Amp?


Edited by cp1966 (12/04/12 08:26 PM)
_________________________
Panasonic TC-P65S1 65" Plasma HDTV, Marantz AV 8801 Preamp, Outlaw 7700 Amp, Klipsch RF7 (X-over dean G modded) RC7 (X-over Dean G modded) RS7 CDT-5800C speakers, Outlaw LFM1 EX Subwoofer, Oppo BDP-93, B & O Turntable, Toshiba HD-A2, Sony CD & DVD 400 disc jukeboxes, DirecTV HD-DVR, PS2, PS3, Wii, Harmony one remote, Monster PowerBar 1200 for the TV, sub, PS3, HD DVD and Wii, Tripp Lite Isolation Bar for the Amp, Pre-Amp and other sources.

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#91935 - 12/04/12 10:36 PM Re: Dreaded ground loop noise? [Re: cp1966]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2676
Loc: Columbus,North Carolina
I would try it on the TV just as an experiment. If you try it on the 5500 don't use it at too high of power. Also the ground pins on the XLR connectors may not function fully for noise reduction but should be OK.
_________________________
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

Top
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