Topic: fireface UCX internal Noise below 25Hz
Hello,
I had problem with strange noise bellow 25Hz on all analog inputs.
It's definitly "internal" noise or some digital artifact and it's present at all sample rates.
I try it with USB and firewire connection-the same.
Without any external signal-unpluged jack is level of it aprox -110dB witch is absolutely OK.
But when I plugged some outboard analog gear with little bigger noise floor, the peak of it is up to -75dB.
There is no DC coupling between outboard gear and UCX, I use transformers on input and output.
Its only visible when I set digicheck spectral analyzer filters to 30band-BIQ.
So recorded it. Strange noise is on picture below 25Hz sine wave for better visualisation.
https://flic.kr/p/2au2FSw
It looks like random interference.
Have anyone similar problem?
thanks
Lukas