ES-9 Inputs 1 and 2 - 48k digital noise

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axisnms
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ES-9 Inputs 1 and 2 - 48k digital noise

Post by axisnms » Tue May 05, 2020 4:45 pm

Hopefully I've done sufficient testing to make this a legit post. Did a fair bit of searching, didn't find this exact issue.

Mac Mini - OSX 10.15.3
Ableton 10.1.9
ES-9 default config 1.0.1 then 1.1.1 - MIDI breakout connected
Monorocket case - Mantis Case

I noticed when trying out new headphones, that when I had record Inputs 1 and 2 armed, I could hear some digital noise. I cranked the monitor a bit and confirmed. I cycled arming/soloing all the other inputs and confirmed it only seemed to be inputs 1 and 2. When unarmed, complete silence.

I recorded a bit of no input silence and confirmed it's in the recording. I went back to the recordings from the last few sessions, found silent bits on tracks using inputs 1 and 2, and confirmed it was in these as well, but not in the other input channel recordings.

I then went to preferences: I run at sample rate of 48000. I switched to 44100, 88200, 96000 - the noise did not seem present. Interestingly 44100 and 9600, the standard noise was slightly higher. Only at 48000 - my long preferred sampling rate - did the noise manifest. I did some silence recordings to confirm. I checked the configuration tool - confirmed default settings - Input DC blocking on.

With exception of a nearby Morphagene, no other near by digital modules, none on the same strip.

I then decided it would be a good time upgrade firmware - which went smoothly. No change, except that oddly, the noise seems like it now has a low pass filter on it. (recorded this)

I then thought, perhaps it was a power issue. I have a handsome Monorocket Lexington, and never had any power related issues before, so hoped it was not the case. I carefully removed the ES-9 and moved to an empty TipTop Mantis case. Same USB cord. Powered up, same issue - noise only at 48000 sample rate only on inputs 1 and 2. Interestingly - the noise was higher pitched. (recorded this)

Moved back to Monorocket. Confirmed issue still present.

My USB cable is decent quality new cable - which is 3m, about max acceptable length as far as I know - but given that issue seems only present on 2 inputs, and I experienced no other issues performance wise, would not suspect length. The cable does run under the Monorocket, behind a dotcom case, to the Mac - given the length I thought maybe noise could be an issue. I tried another USB C cable of the same make, but run "though the air" straight to the mac, near no other powered devices. Same issue.

I have searched the house - and I have no other USB C cables to try - I can order one but that's the only variable I can think to try at this time. I can move to 88000 but would prefer to stay at 48000.

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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by os » Wed May 06, 2020 2:53 am

If you could send the recording of the noise, I would be interested to compare it against what I would consider 'normal'.

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axisnms
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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by axisnms » Wed May 06, 2020 9:54 am

Sure thing. Attaching.
Rendered at 44.1 but you can still hear the change.

These are off input 1, but confirmed same noise was on input 2.
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axisnms
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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by axisnms » Wed May 06, 2020 10:00 am

Quick side note - in the Mantis recording, I rendered some silence from the timeline view, the noise is towards the end.

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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by os » Thu May 07, 2020 11:35 am

That noise is outside the realms of normal, for sure. Viewed on a spectrogram, a constant noise bed is expected, as are a few static peaks, but not a wandering broadband noise like you have there.

Not sure what could cause it though.

I note that the development tools for the USB chip have been updated since. Perhaps rebuilding with latest everything at my end would help.

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axisnms
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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by axisnms » Thu May 07, 2020 1:03 pm

Thanks for looking.

I do have another USB C cable coming (shorter) which I will try.

Let me know if you or anyone else can replicate.

Got to say, brilliant bit of kit. I was waiting a long time for this!

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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by Durdee » Thu May 07, 2020 7:39 pm

Hello, I’ve got the same sound as you do in the 48 mantis recording. I default to 44.1 and that’s where I get it. I never thought to change sample rate but I’ve tried it on different power supplies and it’s occurred on both of them. It’s intermittent, however, and sometimes more noticeable. I have to have the gain cranked to hear it most of the time. I’m glad someone who’s more eloquent and knowledgeable than myself is experiencing this because I have a hell of a time describing it.

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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by Durdee » Thu May 07, 2020 7:42 pm

Mine also is only on channels one and two. In pro Q3 it shows two spikes. I’ve attached a photo. Again, low amplitude, but noticeable at times. I’ve seen those spikes in slightly different positions from time to time, as well.
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axisnms
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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by axisnms » Wed May 13, 2020 10:22 am

Update: Different cable - same issue.

The only thing else would be to get a significantly shorter cable (3ft?) but that would not really work in this studio setup. Any other ideas? I've just not been using inputs 1 and 2 for the time being.

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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by Jaypee » Wed May 13, 2020 12:07 pm

Same here... Otherwise perfect module but these 1&2 inputs can't be used...
"Those aren't your daddy's waveforms " Cynthia Webster

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axisnms
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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by axisnms » Wed May 13, 2020 2:21 pm

Jaypee wrote:
Wed May 13, 2020 12:07 pm
Same here... Otherwise perfect module but these 1&2 inputs can't be used...
Just curious, is it on just one sample rate?

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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by Jaypee » Thu May 14, 2020 1:02 am

I never use 48khz. So I can only confirm it appears on 44.1 khz.
"Those aren't your daddy's waveforms " Cynthia Webster

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Re: ES-9 Inputs 1 and 2 - 48k digital noise

Post by Jaypee » Thu May 14, 2020 1:19 am

I told about it in the ES-9 thread on the main section of MW.

Here are my messages :
Jaypee wrote:
Sat Jan 25, 2020 4:45 am
I have very low but audible high frequencies noise from input 1&2. No pb at all, dead quiet on the others.

I haven't noticed it till recently in studio recording situation.

Will do a screenshot next week.

Meanwhile, can you check if you guys have similar problem?
viewtopic.php?p=3190321#p3190321
Jaypee wrote:
Sat Feb 01, 2020 6:04 am
here is my problem in images:
input one an two have this weird thing
Image

3&4, and all others input don't have this problem
Image
Anyone can check if you have the same problem?

os?
viewtopic.php?p=3194799#p3194799

os wrote:
Sat Feb 01, 2020 6:27 am
I was worried for a moment there until I noticed that the signal is peaking at -90dB. I think this is within spec. Inputs 1/2 are expected to be slightly noisier than inputs 3-14.

That said I don't ever recall noticing such a strong peak in the noise floor. Could you try moving the ES-9 around in your case, or moving some other modules - maybe it's picking something up from elsewhere?
viewtopic.php?p=3194807#p3194807


I tried moving the module etc. Same problem. I just live with that. But meanwhile I miss these 2 input channels.

Compared to you. My problem is not at the same frequencies.
Will record a sample later.
"Those aren't your daddy's waveforms " Cynthia Webster

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