I actually bought the “Rain Rod” version of this amplifier.
My unit is driven by a good 24V Mean Well power supply. The sound is fantastic however my biggest grief about this amp is that it doesnt play well with IEMs. At all volume levels are distinct hiss is present. I was able to stop this from happening by using 3.5mm impedance adapters.
The Rod Rain version of the RNHP needs an earphone with atleast 200 ohm resistance to be noise free. I achieved that by combining impedance adapters. Then I settled on a 75 ohm adapter + ifi earbuddy.
I was interested in trying out the XLR inputs and decided to order a RCA male to xlr male cable on amazon. This went well and I have to say that the sound became clearer but also less loud when i switched to input A.
My desktop setup consists of a DAC that feeds into a tube pre-amp and this amp then feeds into a hybrid amp and finally into my RNHP unit.
It is such a downside that this amp doesnt play well with in Ears and has it’s power switch on the backside.