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#431538 - 03/07/19 09:09 AM ADA Noise Floor
bman84 Online   content
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Registered: 09/29/18
Posts: 181
Loc: Toronto, Ontario
When testing out my ADA1000-3, connected to the pre-outs on my Denon 4500H, I could detect a very quiet hiss when no content was playing (when my ear was within a foot of the speakers).

Just curious if others have noticed this is well with their ADA's, or if my Denon 4500H is the cuplrit (weaker pre-outs and dirtier signal path vs. a proper pre-pro).

If attributable to the ADA, would the ADA1250 and ADA1500 be quieter than the ADA1000 in this regard, or would they exhibit the same quiet hiss?
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Axiom M5HP,VP180,M3,ADA1000
Anthem MRX 720
SVS SB-3000 (dual)

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#431539 - 03/07/19 09:26 AM Re: ADA Noise Floor [Re: bman84]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 6746
Neither your Denon nor your ADA-1000 will give you a "black background". The 1250 is better in this regard than the 1000 and the 1500 better still. I've been trying to understand what noise level gives diminishing returns. When I get my 1000 and 1500, I'll be able to assess this better.
_________________________
M2 coming
A-LFR/1000-8/500v4x2
1000-2,3,1500-3
100,160,QS10x2,800,M5x2,M3,M50 v4
had v2
N2,N3 maybe

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#431540 - 03/07/19 09:34 AM Re: ADA Noise Floor [Re: bman84]
bman84 Online   content
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Registered: 09/29/18
Posts: 181
Loc: Toronto, Ontario
Nice, thanks! Would RCA vs XLR impact this as well? Or only for longer cable runs?


Edited by bman84 (03/07/19 09:36 AM)
_________________________
Axiom M5HP,VP180,M3,ADA1000
Anthem MRX 720
SVS SB-3000 (dual)

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#431541 - 03/07/19 09:44 AM Re: ADA Noise Floor [Re: bman84]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 6746
I think what you are hearing is self-generated noise from thermal and other effects inside the ADA.
_________________________
M2 coming
A-LFR/1000-8/500v4x2
1000-2,3,1500-3
100,160,QS10x2,800,M5x2,M3,M50 v4
had v2
N2,N3 maybe

Top
#431546 - 03/07/19 05:03 PM Re: ADA Noise Floor [Re: bman84]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 6746
I could be wrong, but I think larger ADAs have a lower noise figure because the noise figure is referenced to full power. If it was referenced to 1 Watt, you could compare one model with another. Referenced to full power, I'd have to do some math to compare. Unfortunately I haven't had coffee yet today. I have a rule that says no math, physics or chemistry before coffee.
_________________________
M2 coming
A-LFR/1000-8/500v4x2
1000-2,3,1500-3
100,160,QS10x2,800,M5x2,M3,M50 v4
had v2
N2,N3 maybe

Top
#431549 - 03/07/19 07:11 PM Re: ADA Noise Floor [Re: bman84]
brendo Offline
aficionado

Registered: 10/14/14
Posts: 517
Loc: West coast Canada
The mic. cable or XLR should play louder than an RCA they typically rate XLR signal to about double that of RCA on most equipment. If you have any grounding noises the XLR will also help especially with long run. Although the RCA has the same signal as a balanced. Stay away from balanced to non adapter cables, for me I have a 1\4 TRS to RCA "pro cable"{Digiflex} loves to hum as soon as connected.

The best option is shorter shielded RCA if possible and isolate different cables. Especially power and RCA, try to keep 6 or more inches from power cable proximity Basic power cables emit a lot of E.M.I. Another culprit can also be WIFI to close to say a turntable or even equipment rack. My turntable started giving a decent hum went through tidied cables couldn't figure it out. Turns out I moved the router a couple feet from the TT. Took a couple weeks to realize

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#431553 - 03/08/19 03:23 PM Re: ADA Noise Floor [Re: bman84]
bman84 Online   content
veteran

Registered: 09/29/18
Posts: 181
Loc: Toronto, Ontario
I just got my replacement ADA1000, and I think what I'm hearing is ground loop hum (~120hz, doesn't change when I change the volume on my AVR).

I tried disconnecting my subs, and the noise did not go away. I tried removing the trigger as well, without success. What else can I do?
_________________________
Axiom M5HP,VP180,M3,ADA1000
Anthem MRX 720
SVS SB-3000 (dual)

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#431554 - 03/08/19 05:17 PM Re: ADA Noise Floor [Re: bman84]
Mojo Online   content
axiomite

Registered: 01/21/07
Posts: 6746
Dang. That really sucks.

I recall you have a lot of devices like a ps3, Xbox, etc. Try disconnecting all those from the Denon and see if the problem goes away.

Try plugging the ADA into the same receptacle as the Denon.

Also make sure you're not picking up radiated noise on your RCA cables, power cables or power cords. Try wiggling those around to see if it gets louder or quieter.
_________________________
M2 coming
A-LFR/1000-8/500v4x2
1000-2,3,1500-3
100,160,QS10x2,800,M5x2,M3,M50 v4
had v2
N2,N3 maybe

Top
#431555 - 03/08/19 06:25 PM Re: ADA Noise Floor [Re: bman84]
bman84 Online   content
veteran

Registered: 09/29/18
Posts: 181
Loc: Toronto, Ontario
So I have a Panasonic DP-UB820 4K player connected to my Denon 4500H AVR via HDMI, and then the LCR pre-outs of the 4500H connected to the ADA1000-3 via shielded RCA's. I also have a mono 3.5mm trigger running from the 4500H to the ADA1000. That's it.


Edited by bman84 (03/08/19 06:25 PM)
_________________________
Axiom M5HP,VP180,M3,ADA1000
Anthem MRX 720
SVS SB-3000 (dual)

Top
#431556 - 03/08/19 08:47 PM Re: ADA Noise Floor [Re: bman84]
brendo Offline
aficionado

Registered: 10/14/14
Posts: 517
Loc: West coast Canada
Typically cable company is responsible. When you find a ground loop. If you have a monster power with coax around try it put the cable signal in then another from the out to your cable box or T.V. Since cable isolators are somewhat harder to find these days I find that to be the easiest work around.

If you search Ground loop isolators it should give you, I think it's called Jansen transformers. Really well regarded company specializes in lots of different isolators.

Hopefully you can find the source easily

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