• Registered: 2019-03-05
  • Posts: 7

Topic: Analog line inputs and Mic inputs are noisy? Maybe? Need Help!

I own a Fireface UFX.

With nothing plugged into it, just interface into the computer via usb (for power), my line inputs are showing a level of -93db (RMS). This constantly fluctuates from -93 to -95. My mic inputs read -96 to -98, it also fluctuates.

Should these inputs read UFL/negative infinite? Or do they always have noise even with nothing plugged into it?

  • ramses
  • DAW Mastermind
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  • From: UTC+1
  • Registered: 2012-10-14
  • Posts: 12,886

Re: Analog line inputs and Mic inputs are noisy? Maybe? Need Help!

AFAIR this is normal, has been asked a few times on the forum.

BR Ramses - UFX III, 12Mic, XTC, ADI-2 Pro FS R BE, RayDAT, X10SRi-F, E5-1680v4, Win10Pro22H2, Cub13
  • Registered: 2019-03-05
  • Posts: 7

Re: Analog line inputs and Mic inputs are noisy? Maybe? Need Help!

Sorry that levels I referenced are not RMS. They read -104db to -102db RMS (fluctuating)

  • Jeff
  • Jeff
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  • Registered: 2007-05-21
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Re: Analog line inputs and Mic inputs are noisy? Maybe? Need Help!

Any channel with an A/D converter attached will show self noise even with no audio coming in. Digital channels with nothing connected will show UFL.

Regards,
Jeff Petersen
Synthax Inc.

Jeff's Website

  • Registered: 2019-03-05
  • Posts: 7

Re: Analog line inputs and Mic inputs are noisy? Maybe? Need Help!

Thank you Jeff! My mind can rest now.