HI
Just a basic introduction of my system.
Ampli , DIY based on LM3886 kit of Neurochrom. Good sound, clean, clear, cristal.
Beeing building a CLass A based on the schenatic of the SUGDEN A21 SE.
Stream, before I used chromcast + deezer HIFI, now moved to Volumio on RPI on Qobuz. Dac SMSL M100 connected on usb or toslink
Speaker, Focal Aria 926 
I am studying the best way to connect the dac to the ampli, dac direct to ampli, or via a basic preamp for the impedance adaptation and volume control.
Georges