• Registered: 2014-12-11
  • Posts: 47

Topic: UFX+ crackle

Dear all!

I am running a UFX+ with a ADI-8 MK2 on an iMac Pro (11.6.2) @96kHz  with Reaper. Recently, I hear a crackling sound over the speakers and eventually I get an overload and Reaper will Mute the channel. If I check DIGI-CHECK, channels 01-22 show signal at -90dB when nothing is playing. The other channels show not signal down to -140dB.

I reinstalled the RME drivers but the problem is coming back after some time. Really strange - dying capacitor? Any suggestion?

Thanks in advance,
D

2 Reply by MC

  • MC
  • MC
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  • From: Germany/Thailand
  • Registered: 2007-04-06
  • Posts: 25,525

Re: UFX+ crackle

And you did not have the idea that low level signal is the base noise of the analog inputs?

You run the UFX+ with USB 3? Check the Settings dlalog for USB errors when the crackling reappears.

Regards
Matthias Carstens
RME

MC's Website

  • Registered: 2014-12-11
  • Posts: 47

Re: UFX+ crackle

The Fireface USB setting app is reporting CRC errors.

I am running USB3, the cable is plugged into the USB port of the iMac Pro.

The analog inputs are 'empty' that is have no cables.

What can I do next? I reinstalled the driver & checked the cables.

Thanks in advance.

4 Reply by Soundwunder (edited by Soundwunder 2022-02-01 21:57:19)

  • Registered: 2014-12-11
  • Posts: 47

Re: UFX+ crackle

I could record a spectrum when crackle and pops start while running noise at low level. It shows some very narrow equally spaced high-freq. peaks, a bit like feedback. Unfortunately I am not sure how to upload an image. Perhaps that helps.Cheers

  • Registered: 2014-12-11
  • Posts: 47

Re: UFX+ crackle

Finally, I wiped the HD & made a reinstall. So far, it is quiet.

However, I get lots of CRC errors. What does that mean and how can I improve that?
Thanks in advance!