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#431557 - 03/08/19 09:01 PM Re: ADA Noise Floor [Re: bman84]
bman84 Offline
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Registered: 09/29/18
Posts: 181
Loc: Toronto, Ontario
Thanks, but I don't have cable coax hooked up to any of my gear. Or can it still mess with my household ground circuit?
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Axiom M5HP,VP180,M3,ADA1000
Anthem MRX 720
SVS SB-3000 (dual)

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#431558 - 03/08/19 10:51 PM Re: ADA Noise Floor [Re: bman84]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 6264
If the cable ground is conducting noise, the noise can couple into the ground circuit. You'll have to systematically rule out possibilities as I described above. Also make sure the ADA power cable is fully seated in the ADA.
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A-LFR/1000-8/500v4x2 coming
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#431559 - 03/09/19 05:54 AM Re: ADA Noise Floor [Re: bman84]
bman84 Offline
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Registered: 09/29/18
Posts: 181
Loc: Toronto, Ontario
The Denon looks to be the culprit. If I remove the 3 RCA cables running between it and the ADA, the hum disappears. I noticed that the Denon uses a 2-prong wall plug, so no ground there, but it does have a 'SIGNAL GND' connection point at the back, which the manual states is "used to connect a ground wire for the turntable". I tried connecting a wire to that ground connection, and then touching the other end to various points on the ADA, but that didn't eliminate the hum.
_________________________
Axiom M5HP,VP180,M3,ADA1000
Anthem MRX 720
SVS SB-3000 (dual)

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#431560 - 03/09/19 11:25 AM Re: ADA Noise Floor [Re: bman84]
BBIBH Offline
connoisseur

Registered: 01/10/02
Posts: 1315
Loc: Canada
Couple of random thoughts;

- Did you have this issue previously - you mentioned hiss but not hum?

- Is it possible to check the ground at the receptacle?

- You mentioned isolating to the Denon, but have you removed all inputs (dvd player and all cables) from the Denon and checked? I would also remove the trigger and check for the hum. If you find the hum is gone, begin adding the cables back and see when/if it returns.

- is the dvd player connected to the same receptacle as the denon and amp?
- Do you have another set of RCA cables to test with? Highly unlikely, but I have experienced stranger things....
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Mike

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#431561 - 03/09/19 02:49 PM Re: ADA Noise Floor [Re: bman84]
brendo Offline
devotee

Registered: 10/14/14
Posts: 496
Loc: West coast Canada
My building has lousy grounding.
The external cable grounding on my building {water mains} had been there so long the clamp and the cable were oxidised to the max. A new clamp cost me about 10/15 bucks. Had to cut the old clamp off for the new one. Another problem with this is they have been changing all copper piping to PVC. So could lead to False ground connections.

I also added new receptacle{PS Audio} with an extra ground line to the receptacles box. For me these made a great difference, especially on my noise floor.

Sadly there's no easy fix for such issues. Only process of elimination. Sometimes multiple fixes are necessary.

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#431562 - 03/09/19 03:20 PM Re: ADA Noise Floor [Re: bman84]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 6264
"Sadly there's no easy fix for such issues. Only process of elimination. Sometimes multiple fixes are necessary."

Well said!
_________________________
A-LFR/1000-8/500v4x2 coming
1000-2,3,1500-3
100,160,QS10x2,800,M5,M3,M50 v4
had v2
Air N2 (someday)

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#431563 - 03/10/19 12:33 PM Re: ADA Noise Floor [Re: brendo]
BBIBH Offline
connoisseur

Registered: 01/10/02
Posts: 1315
Loc: Canada
Originally Posted By brendo
My building has lousy grounding.

Yes, industry learned a hard lesson when business systems installers grounded to the nearest fire sprinkler systems and that industry moved away from having the water supply heads loaded with water at all times...bad things happened man, bad things!

Originally Posted By brendo
I also added new receptacle{PS Audio} with an extra ground line to the receptacles box. For me these made a great difference, especially on my noise floor.

If you can - and certainly for new builds/construction - I generally recommend dedicated circuits with isolated grounds be receptacle. The cost at build is negligible and can be worth cost later

Originally Posted By brendo
Sadly there's no easy fix for such issues. Only process of elimination. Sometimes multiple fixes are necessary.

Agreed...but that is part of the fun isn't it? LOL
_________________________
Regards,

Mike

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#431564 - 03/10/19 02:42 PM Re: ADA Noise Floor [Re: BBIBH]
bman84 Offline
veteran

Registered: 09/29/18
Posts: 181
Loc: Toronto, Ontario
Originally Posted By BBIBH
Originally Posted By brendo
My building has lousy grounding.

Yes, industry learned a hard lesson when business systems installers grounded to the nearest fire sprinkler systems and that industry moved away from having the water supply heads loaded with water at all times...bad things happened man, bad things!

Originally Posted By brendo
I also added new receptacle{PS Audio} with an extra ground line to the receptacles box. For me these made a great difference, especially on my noise floor.

If you can - and certainly for new builds/construction - I generally recommend dedicated circuits with isolated grounds be receptacle. The cost at build is negligible and can be worth cost later

Originally Posted By brendo
Sadly there's no easy fix for such issues. Only process of elimination. Sometimes multiple fixes are necessary.

Agreed...but that is part of the fun isn't it? LOL


I do have dual dedicated 20amp circuits for my gear. How does one isolate the grounds?

My house has fibre lines coming in (one from Rogers, and one from Bell) in place of coax. Am I correct in thinking that fibre is immune to the kinds of noise that would be causing my issue?

If I listen to the Denon itself, it seems to make a similar buzz internally. Could it be that the unit has a noisy transformer that the pre-outs are sensitive enough to pick up?
_________________________
Axiom M5HP,VP180,M3,ADA1000
Anthem MRX 720
SVS SB-3000 (dual)

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#431565 - 03/10/19 02:52 PM Re: ADA Noise Floor [Re: bman84]
bman84 Offline
veteran

Registered: 09/29/18
Posts: 181
Loc: Toronto, Ontario
I did also try removing all connections to the Denon. Even with only the pre-outs to the ADA connected, the buzz is still there
_________________________
Axiom M5HP,VP180,M3,ADA1000
Anthem MRX 720
SVS SB-3000 (dual)

Top
#431566 - 03/10/19 03:03 PM Re: ADA Noise Floor [Re: bman84]
brendo Offline
devotee

Registered: 10/14/14
Posts: 496
Loc: West coast Canada
Ironically enough if you check out new Axiom vids. on You Tube. There's some new releases staring Andrew.

One regarding XLR vs RCA. In the vid. he mentions how a subwoofer connected to a different outlet can lead to issues. Also why not to use a balanced to non splitter. {It just cancels the balanced connection}.

Have you tried unplugging your Sub. yet Bman?

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