white noise on phono input

[theaudioguru]

I'm running a D800 and Cadenza Black, so a very similar set up and cartridge setting to yourself.  I find the phono input very quiet, at least by the standards of normal phono stages.  How loud is this white noise exactly?  I presume you are using the Master phono inputs, not the Companions?  This one is very puzzling.

Thanks to both replies above.
Noise is wide spectrum, stereo and occurs at -9 db even when no cables are connected to the phono input on master.
I created a phono input on the companion, same thing! Both unit fed from a Panamax unit.
On other inputs there is no noise at all.

I'm baffled because this is a new phenomena.