With my current system, I can work some more. Not in hurry. Everything still work and enjoyable. As hobby, I still keep track especially on Class D amps. I'm using Equator Audio Q8 and having Yamaha MPS7 as backup system. Using Focusrite Scarlett as audio interface as audio interface. Yup, I am using for DAW. My former setup was Pioneer DVD player with YBA integrated with Martin Logan Ascent. Cable mostly DIY, monster cable, some given to me, Belden cables. I used to attend hifi shows. Really don't mind paying the tickets. Listen to Wilson Audio, Mark, Krell, Goldmound, MBL, Audio Note......etc listen to their systems were enjoyable.
For your second question. Speaker and amp must of course drive properly. Some speaker measurement quite flat, but so so in detail. Some speaker measure not so flat, but giving more detail. It is possible to flatten the speaker with over beefed up crossover. More inductor, capacitor and resister to flatten the respond. More these in signal path more degradation in micro detail. The cabinet also add it own resonance on the speaker. Your amp connect to the source like streamer, CD player.....etc. You have to look out for RCA and XLR connection. Cable come into place. Some bright, some very mid, some bassy even they can measured very close together. Again amp and speaker you really got to listen with volume you are listening to. It is ok to have overkill amp power than the speaker handle. Of course, you listen to the soundstaging, imaging, top, mid, low.....etc with your favorite music. It is very hard to express in writing. Really listen more.