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TOPIC: nanoAVR Signa:Noise Ratio?

nanoAVR Signa:Noise Ratio? 2 years 1 month ago #16039

  • maxmercy
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What is the SNR of the nanoAVR? I am encountering some HF noise when the nanoAVR is in-line, and can stop it by just disconnecting the input to the nanoAVR. I have 3 separate BDPs and all exhibit the same HF whine with the nanoAVR in-line if the BDP is sending a signal. During BDP startup/home menu transitions, silence.

Any ideas? I have tried swapping cables, etc. Anyone else experiencing this problem?

JSS
Last Edit: 2 years 1 month ago by maxmercy.
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nanoAVR Signa:Noise Ratio? 2 years 1 month ago #16040

  • Jim the Oldbie
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Hello,

Since nanoAVR is all digital, the noise floor is normally way, wa-ay down there, probably very close to the theoretical 24-bit limit like -144 dB or whatever that is. I have 2 of them, and they are absolutely silent. Since you've already swapped your source and cables, the only other variable is your AVR, but if it works normally with the nanoAVR out of the path, I wonder if maybe your nano is defective? :o/

-- Jim
Last Edit: 2 years 1 month ago by Jim the Oldbie.
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nanoAVR Signa:Noise Ratio? 2 years 1 month ago #16049

  • devteam
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@ JSS,

Already answered correctly by Jim. All in digital domain so SNR isn't the issue here. (used when there is some level of conversions).
We've never had a customer with this issue here before so not sure what it could be to be honest... Few things you could try:
1) Disconnect the USB/Ethernet and keep the HDMI only
2) See if your power supply is grounded/earthed (maybe noise carried over)
3) Disconnect the HDMI input only to see if it's a chain issue. Keep the HDMI output to the nanoAVR.
4) Send your configuration file here for review using the tech support ticket system (minidsp.desk.com). Possible that the noise that you're hearing is due to some overdriving (i.e. higher THD) down the line like @ your AV receiver when there is some D/A conversions. That could be a cause. .
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nanoAVR Signa:Noise Ratio? 2 years 1 month ago #16061

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I will run the tests above and reply back this weekend.

JSS
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nanoAVR Signal:Noise Ratio? 2 years 1 month ago #16076

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devteam wrote:
@ JSS,

1) Disconnect the USB/Ethernet and keep the HDMI only - No change. If the BDP is sending data, the noise is present.
2) See if your power supply is grounded/earthed (maybe noise carried over) - The power supply for the nano has no grounding plug, but it is plugged into a power strip which everything else is plugged into. No ground loops. Even if I disconnect cable, no change.
3) Disconnect the HDMI input only to see if it's a chain issue. Keep the HDMI output to the nanoAVR - YES. Taking out HDMI IN cable from back of nanoAVR made it silent.
4) Send your configuration file here for review using the tech support ticket system (minidsp.desk.com). Possible that the noise that you're hearing is due to some overdriving (i.e. higher THD) down the line like @ your AV receiver when there is some D/A conversions. That could be a cause. .

The editor will not allow me to attach the config right now... I am playing with some more gain structure things to see if I can sort this out. See above for answers. My basic config file is a straight passthrough with -7dB attenuation on all channels to avoid the overload my AVR causes when it tries to bass manage high signal LFE + LCRS content.

JSS
Last Edit: 2 years 1 month ago by maxmercy.
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nanoAVR Signal:Noise Ratio? 2 years 1 month ago #16077

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Well I found the problem. My pre/pro. I put my old AVR in the signal chain and silence, even at high volumes. Now just to find a good, noiseless bump box for the XLR-in subwoofer amps...

JSS
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nanoAVR Signal:Noise Ratio? 2 years 1 month ago #16079

  • Jim the Oldbie
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maxmercy wrote:
Well I found the problem. My pre/pro. I put my old AVR in the signal chain and silence, even at high volumes.

Excellent! Good to know it's not the nanoAVR at least. But all may not be lost if you'd prefer using your newer (presumably better) receiver. You might still be dealing with a ground loop or something like that somewhere. Different components can react differently to that sort of thing, without actually being defective. If you haven't already, try hooking up the first AVR with just the minimum of components, for example just the BD to nano to AVR to speaker, with nothing else connected. If this setup is noise-free, then try adding the rest of your sources etc, one at a time and see if there's a point where the noise reappears. This may reveal more clues.

Now just to find a good, noiseless bump box for the XLR-in subwoofer amps...

Got any little stereo receivers/amps lying around? The speaker outs will get you there temporarily, if you're careful... :o)

I'm putting my subs back together tonight too. Good luck to us both...

-- Jim
Last Edit: 2 years 1 month ago by Jim the Oldbie.
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