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#95846 - 06/23/16 01:02 AM 7900 and slight hum
mgdurand Offline
Gunslinger

Registered: 11/21/03
Posts: 147
Loc: Lafayette, LA, USA
Hi, cowboys! Has been a long time since I have visited. Have upgraded a lot of components, but still have my Outlaw Audio 7900 heating the HT room. Question. If I turn all noise producing sources down I get a very slight hum coming from the amp. With any gain it is not audible. May try this weekend to see if I can be a sleuth and track it down. Could be a ground loop and successfully dealt with that issue a few years back. Still love this amp and the power for the price.
_________________________
75" 4K HDR Sony XBR 75X95k mini-LED TV
Marantz AV7706 pre-pro
OPPO UDP 203 4K Ultra HD Blu-ray Player
Mirage HDT Speaker System (LCR [OM-5s for L&R and HDT-F for center], SR, SL, SBR, SBL [HDT-Rs])
Dual SVS PB12-Plus Subs
Outlaw Audio Model 7900 Power Amp w/Dual Emotiva CMX-2
AudioControl BijouTM THX� Equalizer
Rega RP1 Turntable
Dual Panamax M5300-PM Power Conditioners
Dual Monster Power HTS 2500 Power Conditioners
Dual Monster Power HDP 1800 Power Conditioners
Clearplay Blu-ray Player
Motorola VIP1200 HD cable receiver
Logitech Harmony Elite Remote

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#95847 - 06/23/16 12:23 PM Re: 7900 and slight hum [Re: mgdurand]
Outlaw Ben Offline

Gunslinger

Registered: 10/31/13
Posts: 241
Feel free to send us an email at customerservice@outlawaudio.com so we can be of further assistance. If you do, please start with whether the noise is emanating from the chassis of the amp, or from the speakers, and if it fluctuates in pitch or amplitude.

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#95848 - 06/23/16 07:32 PM Re: 7900 and slight hum [Re: mgdurand]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2676
Loc: Columbus,North Carolina
When you hear the noise, remove your speaker grills and lightly touch the speakers to feel if the noise is coming from them.
_________________________
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
#95856 - 06/27/16 12:03 PM Re: 7900 and slight hum [Re: mgdurand]
Helson Offline
Gunslinger

Registered: 03/21/12
Posts: 283
Loc: USA
It is normal to hear a slight hum coming from power transformers when AC current is flowing through the coils. The hum is normally audible only within a foot or two. Ground loop issues will cause hum though all speakers, not from the amplifier.
_________________________
Main HT <> 976 <> 7200 <> Ultra-X12 <> sapphire ST2 mkII RF/LF <> sapphire SC center
sapphire ST2 mkII SBR/SBL <> sapphire SS SR/SL <> Verizon/DVR <> Vizio M70Q7 <> Oppo UDP-203 <> Amazon 4k Fire TV

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#95857 - 06/28/16 02:18 PM Re: 7900 and slight hum [Re: mgdurand]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2676
Loc: Columbus,North Carolina
If the noise is coming from the amp you should be able to feel the vibrations at 60hz just by touching the amp.
_________________________
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
#95910 - 07/19/16 11:53 PM Re: 7900 and slight hum [Re: mgdurand]
mgdurand Offline
Gunslinger

Registered: 11/21/03
Posts: 147
Loc: Lafayette, LA, USA
Taking the analysis road very slowly as I don't have time right now for an extended session. Turned off all lights, fans, etc. and then only turned on pre-pro and amplifier. No hum or noise whatsoever. Will start by turning on most common appliances first to see what gives. Then will move on to inputs/components. Would love it if gremlins struck and noise just magically went away!
_________________________
75" 4K HDR Sony XBR 75X95k mini-LED TV
Marantz AV7706 pre-pro
OPPO UDP 203 4K Ultra HD Blu-ray Player
Mirage HDT Speaker System (LCR [OM-5s for L&R and HDT-F for center], SR, SL, SBR, SBL [HDT-Rs])
Dual SVS PB12-Plus Subs
Outlaw Audio Model 7900 Power Amp w/Dual Emotiva CMX-2
AudioControl BijouTM THX� Equalizer
Rega RP1 Turntable
Dual Panamax M5300-PM Power Conditioners
Dual Monster Power HTS 2500 Power Conditioners
Dual Monster Power HDP 1800 Power Conditioners
Clearplay Blu-ray Player
Motorola VIP1200 HD cable receiver
Logitech Harmony Elite Remote

Top
#95912 - 07/21/16 11:32 AM Re: 7900 and slight hum [Re: mgdurand]
Helson Offline
Gunslinger

Registered: 03/21/12
Posts: 283
Loc: USA
Check any lighting that powers on with toggle switching. Had a friend that figured out the DC on his line was caused by his range hood lighting switch.
_________________________
Main HT <> 976 <> 7200 <> Ultra-X12 <> sapphire ST2 mkII RF/LF <> sapphire SC center
sapphire ST2 mkII SBR/SBL <> sapphire SS SR/SL <> Verizon/DVR <> Vizio M70Q7 <> Oppo UDP-203 <> Amazon 4k Fire TV

Top
#95917 - 07/25/16 12:35 PM Re: 7900 and slight hum [Re: mgdurand]
butchgo Offline
Desperado

Registered: 06/22/07
Posts: 368
Loc: Southern Oregon coast
I had the same problem with my 7500 so I bought a Channel Islands filtered power outlet and that took care of the problem.
You might want to look into the Outlaw Surgex or the Emotiva CMX-2.
_________________________
Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for LCR & L/R surrounds
1- Emotiva Mini X-A100 for rear surrounds
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Enzo XL L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center

Top
#95919 - 07/26/16 12:13 AM Re: 7900 and slight hum [Re: butchgo]
mgdurand Offline
Gunslinger

Registered: 11/21/03
Posts: 147
Loc: Lafayette, LA, USA
Thanks! May have to look into that!
_________________________
75" 4K HDR Sony XBR 75X95k mini-LED TV
Marantz AV7706 pre-pro
OPPO UDP 203 4K Ultra HD Blu-ray Player
Mirage HDT Speaker System (LCR [OM-5s for L&R and HDT-F for center], SR, SL, SBR, SBL [HDT-Rs])
Dual SVS PB12-Plus Subs
Outlaw Audio Model 7900 Power Amp w/Dual Emotiva CMX-2
AudioControl BijouTM THX� Equalizer
Rega RP1 Turntable
Dual Panamax M5300-PM Power Conditioners
Dual Monster Power HTS 2500 Power Conditioners
Dual Monster Power HDP 1800 Power Conditioners
Clearplay Blu-ray Player
Motorola VIP1200 HD cable receiver
Logitech Harmony Elite Remote

Top
#95920 - 07/26/16 12:49 AM Re: 7900 and slight hum [Re: butchgo]
mgdurand Offline
Gunslinger

Registered: 11/21/03
Posts: 147
Loc: Lafayette, LA, USA
Did some reading and the Emotiva unit looked like it might fit the bill. I noticed that the combined load recommendation for both outlets is 15A. Given the two power cords on the 7900 I went with 2 of the Emotivas. Will hook up this weekend and keep my fingers crossed.
_________________________
75" 4K HDR Sony XBR 75X95k mini-LED TV
Marantz AV7706 pre-pro
OPPO UDP 203 4K Ultra HD Blu-ray Player
Mirage HDT Speaker System (LCR [OM-5s for L&R and HDT-F for center], SR, SL, SBR, SBL [HDT-Rs])
Dual SVS PB12-Plus Subs
Outlaw Audio Model 7900 Power Amp w/Dual Emotiva CMX-2
AudioControl BijouTM THX� Equalizer
Rega RP1 Turntable
Dual Panamax M5300-PM Power Conditioners
Dual Monster Power HTS 2500 Power Conditioners
Dual Monster Power HDP 1800 Power Conditioners
Clearplay Blu-ray Player
Motorola VIP1200 HD cable receiver
Logitech Harmony Elite Remote

Top
#95921 - 07/26/16 11:59 AM Re: 7900 and slight hum [Re: mgdurand]
XenonMan Offline
Desperado

Registered: 04/08/08
Posts: 2676
Loc: Columbus,North Carolina
If it is a ground loop hum it will come from your speakers. Make sure all of your equipment shares a good common ground including your cable/satellite tv wiring.
_________________________
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
#95926 - 07/28/16 10:28 PM Re: 7900 and slight hum [Re: mgdurand]
mgdurand Offline
Gunslinger

Registered: 11/21/03
Posts: 147
Loc: Lafayette, LA, USA
Got the Emotiva units in. Hum had returned like a thief in the night. I connected a power cord to each Emotiva unit and fired it up. I did not hear hum. Even more convincing - wife did not hear hum. Nothing from the amp except silence! Will hold off celebrating until a week or two pass as I know things like this can come and go. But am very pumped and enjoying the silence. Thanks to butchgo for the suggestion!


Edited by mgdurand (07/29/16 08:18 AM)
_________________________
75" 4K HDR Sony XBR 75X95k mini-LED TV
Marantz AV7706 pre-pro
OPPO UDP 203 4K Ultra HD Blu-ray Player
Mirage HDT Speaker System (LCR [OM-5s for L&R and HDT-F for center], SR, SL, SBR, SBL [HDT-Rs])
Dual SVS PB12-Plus Subs
Outlaw Audio Model 7900 Power Amp w/Dual Emotiva CMX-2
AudioControl BijouTM THX� Equalizer
Rega RP1 Turntable
Dual Panamax M5300-PM Power Conditioners
Dual Monster Power HTS 2500 Power Conditioners
Dual Monster Power HDP 1800 Power Conditioners
Clearplay Blu-ray Player
Motorola VIP1200 HD cable receiver
Logitech Harmony Elite Remote

Top
#95927 - 07/29/16 09:15 PM Re: 7900 and slight hum [Re: mgdurand]
butchgo Offline
Desperado

Registered: 06/22/07
Posts: 368
Loc: Southern Oregon coast
Glad they are working for you.
_________________________
Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for LCR & L/R surrounds
1- Emotiva Mini X-A100 for rear surrounds
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Enzo XL L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center

Top
#95943 - 08/06/16 04:24 AM Re: 7900 and slight hum [Re: mgdurand]
mgdurand Offline
Gunslinger

Registered: 11/21/03
Posts: 147
Loc: Lafayette, LA, USA
They are definitely working. Hum gone for almost 1 week now. Am very pleased at the sounds of silence. Worth the $175.00 easily!
_________________________
75" 4K HDR Sony XBR 75X95k mini-LED TV
Marantz AV7706 pre-pro
OPPO UDP 203 4K Ultra HD Blu-ray Player
Mirage HDT Speaker System (LCR [OM-5s for L&R and HDT-F for center], SR, SL, SBR, SBL [HDT-Rs])
Dual SVS PB12-Plus Subs
Outlaw Audio Model 7900 Power Amp w/Dual Emotiva CMX-2
AudioControl BijouTM THX� Equalizer
Rega RP1 Turntable
Dual Panamax M5300-PM Power Conditioners
Dual Monster Power HTS 2500 Power Conditioners
Dual Monster Power HDP 1800 Power Conditioners
Clearplay Blu-ray Player
Motorola VIP1200 HD cable receiver
Logitech Harmony Elite Remote

Top
#95945 - 08/08/16 01:41 PM Re: 7900 and slight hum [Re: mgdurand]
butchgo Offline
Desperado

Registered: 06/22/07
Posts: 368
Loc: Southern Oregon coast
Good deal.
I know how annoying the humming can be after going through it with my 7500.
_________________________
Epson 3500 3D projector
93" Carl's Place Flexiwhite DIY screen
Outlaw 976 Pre/Pro
Outlaw 7500 for LCR & L/R surrounds
1- Emotiva Mini X-A100 for rear surrounds
2- Outlaw LFM-1 EX subs
Oppo BDP-105 Blu-ray/DVD/SACD player
Outlaw LCR (Snell Labs) for center channel duty
Tekton Enzo XL L/R
4- Emotiva ERD-1s surround speakers
Monster HTS3600MKII power center

Top
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