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#92100 - 12/20/12 10:17 AM Re: Dreaded ground loop noise? [Re: cp1966]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2676
Loc: Columbus,North Carolina
We can't put a man on the moon anymore. We can't get men into space without another country picking up hitchhikers. Sorry the problem could not be fixed. I have the 7125 and the 7500 and both are dead quiet. Since yours is quiet until you connect an HDMI cable I would steer away from the amp as the problem.
_________________________
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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#92101 - 12/20/12 10:39 AM Re: Dreaded ground loop noise? [Re: XenonMan]
EEman Offline
Desperado

Registered: 11/11/09
Posts: 514
Loc: Canton, MI
I don't know. I'm beginning to think the amp is the problem. Something has gone bad and the power supply isn't regulating or a cap blew and DC isn't decoupled properly or something.

I also don't buy that the transformer is acting as an antenna as ferrous core toroids make lousy antennas. However I'll grant that something might be broke here too.

My 7075 isn't dead quiet. I get a little of what sounds like transformer delamination noise which is strange becasue I thought the transformers where ferrite core not laminated steel. Haven't popped it open yet to explore. The noise level is low-I can't hear it from more than a couple feet away.

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#92102 - 12/20/12 02:29 PM Re: Dreaded ground loop noise? [Re: EEman]
amaheshw Offline
Deputy Gunslinger

Registered: 09/13/12
Posts: 2
Loc: Washington, DC
XenonMan and EEman -- I appreciate your thoughts that this is unlikely to be a mere transformer design issue, as I hastily speculated. I have decided to give this one last try and will exchange the 7900 instead of returning it. Also, I had an extremely helpful discussion today with ATI. cp1966 I'm sure you have already tried this, but the technician suggested gounding all components together to a common point and terminating w/a crimp connector or something similar. I have only done this with 3 of my four components, so it may work. Will report back in mid-January when I have received the new unit and completed my troubleshooting.

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#92522 - 01/31/13 02:16 PM Re: Dreaded ground loop noise? [Re: cp1966]
cp1966 Offline
Gunslinger

Registered: 04/20/07
Posts: 221
Loc: Minneapolis
UPDATE;

Outlaw did accept the return of the 7005. I auditioned the new 8801 and it works great; NO BUZZ!
_________________________
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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