1 (edited by juzisound_ltd 2022-12-07 12:27:44)

Topic: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

Problem 1
Noise in only one channel - left - around 22.6 KHz
Level of noise not dependent from input Ref Level, AD Filter Mode or DC Filter.
Level of noise dependent from Trim Gain Left.
Freq of noise not dependent from sample rate. Equal for 44100 - 192000.
Freq on noise dependent from card temperature.
Low temperature (when card start) produce high freq - around 23 KHz.
Normal work temperature produce 22.6 KHz.
Audible high-freq noise from card, when imput is captured/enabled.

Problem 2
High noise from inputs in high sample rates >  192KHz

Tested on multiple computers...

Dont know how to attach pictures there ?

Owner of Juzisound Ltd
www.juzisound.com

2 (edited by KaiS 2022-12-07 17:29:04)

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

What is connected to the inputs?

For correct testing the inputs XLR’s pin 2+3 need to be shorted to ground pin 1, and nothing else connected.

To create a shorting plug, eg. tightly stick a little piece of aluminum foil between the 3 pins of a male XLR before plugging it to ADI-2 Pro.
The other side of the cable (XLR female) just leave laying unplugged.

3 (edited by juzisound_ltd 2022-12-08 05:16:45)

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

Nothing is connected to left channel with problem, but nothing is connected to right channel too, and in right no problem.
Card is already returned to local distributor today. Second time return…but now keep some images with problem.
Problem is visible in spectrum analysers, include rme digicheck.
When card is cold, immediate after power up, frequency of problem is high, and immediate with increase of temperature freq is lowered.
Think dc-dc problem, or self oscillating opamp.
Level of noise is not dependent from analog input sensitivity.
This is tested in two different places and with different computers.

The same problem is found, if both or only problematic input is loopback to output for loopback test with RMAA or similar soft.

Overal noise 20 - 20k is around -140 db. Problematic freq glitch around 22kHz is with level around -110 db, and in 192kHz is visible second harmonic.


What about second problem?
If card is in sample rate over 192 kHz, noise is visible in both inputs indicator on card, and noise increase with high samplerates. In highest samplerate, indication is around -42db…
Card is in preamp mode. Nothing connected, usb too. Only power.

For now, we not test recording or spectrum analyser over 192kHz. Only see card indication.

And, problem 3
The audible, high-pitched squeak is still there…

Owner of Juzisound Ltd
www.juzisound.com

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

An Open Input always shows noise. It acts as an antenna.
Read post 2of KaiS.
Georg

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

georgob wrote:

An Open Input always shows noise. It acts as an antenna.
Read post 2of KaiS.
Georg

How this affected only one input?
How this affected when loopback connection is used?

Owner of Juzisound Ltd
www.juzisound.com

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

Try to terminate the inputs . You can make no certain measurements with open inputs. It is  not predictable .
Don’t know about the loopback.
G

7

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

Serial number of unit?
When did you buy it?
Host a pic of the FFT somwhere so we can download it.
Is that really noise or a single tone?

Regards
Matthias Carstens
RME

8 (edited by juzisound_ltd 2022-12-08 05:13:07)

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

Serial number of unit is: 52010263
Buy from Bulgaria local distributor: Almar Co LTD
Problem is single tone, not noise.
http://www.juzisound.com/rme/rme_1
Zoom
http://www.juzisound.com/rme/rme_2
http://www.juzisound.com/rme/rme_3

Owner of Juzisound Ltd
www.juzisound.com

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

Digicheck - normal and faulty channel:
http://www.juzisound.com/rme/rme_5
http://www.juzisound.com/rme/rme_4

Owner of Juzisound Ltd
www.juzisound.com

10 (edited by juzisound_ltd 2022-12-08 05:15:58)

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

About high sample rate: Preamp mode, nothing is plugged to card.
http://www.juzisound.com/rme/rme_352
http://www.juzisound.com/rme/rme_384
http://www.juzisound.com/rme/rme_768

Owner of Juzisound Ltd
www.juzisound.com

11

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

The rising noise is explained in the manual and fully normal. The 'tone' is a hardware error that needs modification and was fixed 1 or 2 years ago, so you need to return the unit for further examination.

Regards
Matthias Carstens
RME

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

MC wrote:

The rising noise is explained in the manual and fully normal. The 'tone' is a hardware error that needs modification and was fixed 1 or 2 years ago, so you need to return the unit for further examination.

Hi
Thanks for answer!
About rising noise in high part of spectrum, yes, we know this. This dependent from filter...oversampling...

This is valid for >192kHz too?
We mean pictures of internal indicators when SR is >192. That is normal ?
We not have experience to this time with freq over 192kHz...

About "tone", yes, my be this card is really old, because now no stock in Europe.
We looking to buy this card from many many month, to use like measurement instrument in my company, and be very happy with lucky stock in my country "not officially published", but ...  faulty unit.

How to organize repairing. Took with local distributor or direct with RME support?

P.S.
If fixing is easy, we produce similar production, and have capacity to fix this there, without disturb RME.

Owner of Juzisound Ltd
www.juzisound.com

13

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

Please contact the local distrbutor. We will instruct him what to do so the unit hopefully does not have to be sent to Germany.

Regards
Matthias Carstens
RME

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

OK
Thanks Matthias!

Owner of Juzisound Ltd
www.juzisound.com

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

What about signal in internal level indicators, when sample rate is above 192kHz ?
This is problem or not ?

Owner of Juzisound Ltd
www.juzisound.com

16

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

No problem but the simple truth. 384 kHz bandwidth is a lot of noise added up.

Regards
Matthias Carstens
RME

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

MC wrote:

The rising noise is explained in the manual and fully normal. The 'tone' is a hardware error that needs modification and was fixed 1 or 2 years ago, so you need to return the unit for further examination.


relating to. "The Tone".
Does this mean that there is a known hardware failure in a particular range of serial numbers?
I don't have much sense to do the "tone test" myself.

Mine (ADI -2 PRO FS R BE) was bought (new) in March 2022. It has serial number 52010137.

Regards Søren

Re: RME ADI-2 PRO FS R BE - Input Noice Problem in one channel

Sound card is replaced with new unit, and now all is OK.
Thanks to Matthias for help!

Owner of Juzisound Ltd
www.juzisound.com