1 Topic by isak.mgm (edited by isak.mgm 2017-05-03 15:46:14)

  • Registered: 2016-10-30
  • Posts: 6

Topic: FireFace400 Balanced signal

Hi all.

i have a technical question please.
ive checked the balanced output in all 6 (didnt chcked 7/8) outputs of the FF400 with my scope.
could it be that the Hot signal is stronger than the Cold signal?

regards,
Isak

2 Reply by MC

  • MC
  • MC
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  • From: Germany/Thailand
  • Registered: 2007-04-06
  • Posts: 25,444

Re: FireFace400 Balanced signal

Yes, that is normal and nothing to worry.

Regards
Matthias Carstens
RME

MC's Website

  • Registered: 2016-10-30
  • Posts: 6

Re: FireFace400 Balanced signal

HI MC and thank you for your reply.

i was not worried at all.
i was a bit surprised to see it, that it smile

i know they suppose to be identical in perfect anti phase.

  • Registered: 2012-04-15
  • Posts: 90

Re: FireFace400 Balanced signal

How are you measuring the signals?
If you are using the ground (sleeve or pin1) as a reference that may not be a valid method.

In balanced audio, the ground doesn't carry any signal or have any reference to 'hot' or 'cold', it just provides a drain for the shielding.

"An ideal balanced audio receiver is a differential amplifier. It works by measuring the difference between its two inputs, and calling that difference the signal. "Ground" is totally irrelevant."

https://electronics.stackexchange.com/q … dio-signal

The 'hot' and 'cold' should be identical, just inverted with respect to one another, that's the important measurement.

  • Registered: 2016-10-30
  • Posts: 6

Re: FireFace400 Balanced signal

thank you for your reply.
in other RME sound cards not FF400 or 800, its ok, they are same with the GND test as i checked.

thank you for the link smile