@ieales Totally agree that the Mid HF should be set to low. Fair question about the selection of components. Let me start with: this is the first genuine stereo I have set up since grad school when I bought mission speakers and a Harman Kardon amp at a big sale. So started with total ignorance.
I read online reviews of speakers and bought the KLH model 5s without listening - before buying any other component. I did audition the Hegel H390 at a stereo store. I had gone in with the intention of buying the H190 but the H390 was so much less lively (in a good way) and also quiet that I sprang for the latter. When I started listening, I really missed the bass that had come through better in the stereo store with the JBL 100s so added the REL subs. Which were a huge improvement. The Lumin T2 was the result of reading other posts about streamers which paired well with the Hegel. No regrets vis a vis the Hegel, subs or Lumin (the DAC is head and shoulders above that of the Hegel H390). Speaker cables as well as power and ethernet are all from audiosensibility in Toronto.
I have put the subs in the corner now and the listening sofa is mid room (with no wall behind).
Apologies for the very long response ! I am open to speaker suggestions for this particular set up and room. Not in a hurry to upgrade but it is on my radar.