Very curious to see how this ends up. I bought a pair of 606 s2 anniversary edition, but I ultimately had to return them for their tinny aluminum sounding tweeter. I just couldn’t get over the limitations of the high end. I wonder if better quality parts could round out this speaker. I know it could definitely benefit from some no-rez. I’d highly recommend that part of any upgrade, as I believe those speakers lack any internal bracing.