I can confirm this. I used my Sony STR-DE845 receiver during the burn-in process. The 701's had a much darker presentation with deep, boomy and uncontrolled bass but mate them with my MPX3 slam and it's a totally different story. The balance returned and the bass became very, very tight and full of impact. I will admit to having some concerns about these cans early on but as things have progressed, I'm becoming more and more enamored with these cans. They're looking like a keeper for sure at this point. I'm digging them!!