I've had some pretty nice systems throughout my lifetime. When COVID struck and I had some time at home I decided to get a digital sound processor. I fiddled for weeks and tri-amped my speakers with a relatively cheap Rotel 6 channel SS amp. I got a microphone and some software to record the frequency response. WOW, what a learning experience! There were a lot of peaks and valleys in the frequency response. I did some correction with the DSP, and did a time delay to align the speaker drivers. Adjusted the location of speakers in the room, and did some room treatment. The results were incredible. This is the best sounding system I've ever had. And I can still tweak it to sound better.
Before you spend $2K on those speaker cables, think about measuring your frequency response and making adjustments to get it flatter.