After many years without a high end system (I sold mine years ago), I inherited my dad’s system. He was running Thiel CS 2 2’s with a McCormick DNA-1 Deluxe, Sonic Frontiers SFL-1 pre-amp and old Cardas cables. I never loved the Thiels. To me they sounded cold and the system was fatiguing. Once I got the system, I put swapped out the Cardas cables and IC’s for some Graham Slee cables and IC’s (pretty reasonably priced and very under the radar). I also put a Gold Lion tube one the SFL-1. BOOM! The system became extremely musical, but still transparent. No fatiguing at all. Now I can really appreciate the Thiels.