Upgrade HDX-DAC-XPS to NDS-555PS?

So… ND5XS2 is here and it sounds perfect! Oh yeah it is better than HDX.
Will test much more tomorrow.

One question…
When powered up coming from standby there is a louder clicking inside. It is louder - does not sound any damaged.
Is this normal?
How is yours when switched on?

Think it is normal behavior… Click

I think I will not shut it down it to standby… will keep it in operation as all my units :o) so no click