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#97753 - 02/07/18 02:32 PM 7140 Low level hum
Tok Offline
Deputy Gunslinger

Registered: 01/26/18
Posts: 1
My 7140 is exhibiting a low level hum in several channels with nothing connected other than the speakers.

I had a louder hum with things connected but a coaxial isolation transformer killed most of the noise from the cable satellite box. Now with everything disconnected I am still getting a low level buzz hum in at least 3 channels. The transformer in the unit itself does hum/buzz a little.

Is there anything else I should try or should contact Outlaw about fixing it?

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#97777 - 02/14/18 07:31 AM Re: 7140 Low level hum [Re: Tok]
EEman Offline
Desperado

Registered: 11/11/09
Posts: 478
Loc: Canton, MI
You probably have some DC on your main power feed. A power conditioner might clean this up for you.

Also try running a signal through the amp and see if the problem goes away. The toroidal transformers Outlaw uses saturate pretty easily when not loaded but come out of saturation pretty quickly when you start driving the amps.
_________________________
975/7075/SMS-1
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-203, XBOX360, Xbox One
LG 65" OLED
RR2150 w/Klipsch SCR-2

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#97782 - 02/14/18 02:00 PM Re: 7140 Low level hum [Re: Tok]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2548
Loc: Columbus,North Carolina
You could also try a different receptacle for the amp just to check the above issue.
_________________________
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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