First post here woo! I got my FM3 in February and it's awesome, but was curious about the noise I'm seeing in the spectra and if it was normal.
The patch I'm using for my test is Input (gate off) -> filter (flat w/ 20 dB boost) -> output.
The first measurement I have FM3 -> usb (no cable attached). Looks good to me, I don't know what the reference voltage is but still looks low and flat.
Now I add my TS cable so TS cable -> FM3 -> usb and get this. Which shows the 60 Hz and harmonics. Obviously, the cable acts like an antenna and so it has to be either EMI or poor isolation in the unit itself? As expected putting the free end of the TS cable near a power cord boosts the 60 Hz and the harmonics, I feel like
If I switch my interface to my zoom uac and swap the TS cable cable -> zoom -> usb I get this. I didn't set the noise floor to the same level but you can see the peak of that 60 Hz isn't nearly as high relative to the background regardless.
Any ideas?
The patch I'm using for my test is Input (gate off) -> filter (flat w/ 20 dB boost) -> output.
The first measurement I have FM3 -> usb (no cable attached). Looks good to me, I don't know what the reference voltage is but still looks low and flat.
Now I add my TS cable so TS cable -> FM3 -> usb and get this. Which shows the 60 Hz and harmonics. Obviously, the cable acts like an antenna and so it has to be either EMI or poor isolation in the unit itself? As expected putting the free end of the TS cable near a power cord boosts the 60 Hz and the harmonics, I feel like
If I switch my interface to my zoom uac and swap the TS cable cable -> zoom -> usb I get this. I didn't set the noise floor to the same level but you can see the peak of that 60 Hz isn't nearly as high relative to the background regardless.
Any ideas?