Help an old guy with connection question please

Unfortunately the USB input on your amp is meant for USB style digital data - generally from a computer

It will not be compatible with the digital output from the Node 2 - they are two different formats and probably differing digital resolutions

You will require some other device to convert the digital signal out from the Node 2 into  a USB style data stream.

Take a look at this Agon thread - it explains some related issues
https://forum.audiogon.com/discussions/spdif-to-usb-converter

The DAC in the Node 2 is extremely good and so are its associated analogue circuits. I have found that it performs to a whole new level of sound quality if you use great Analogue Interconnects and a great power cable.

Regards - Steve

I doubt the USB input will sound as good as using the Bluesound DAC into an analog input. 

The OP's amp only has analog or usb digital.  

RCA out of streamer to RCA in on integrated amp.

I have only analog inputs. 

I use a Bluesound node 2 with a Kinki ex M1, an integrated amp. The Bluesound DAC is very good. Simply use an rca output from the Bluesound to an analog input on your integrated. You’ll be delighted.