Burson Playmate 2 P-171 with Burson V6 Classic Opamps

I purchased 2xV6 Classic Singles and 2xV6 Vivid Singles - I already had Dual versions of each. I've tried all in my new Burson Playmate 2, and much prefer the Classic sound signature, both, on my speakers, and headphones, but even sound with Vivids is much improved upon the stock op amps that PM2 ships with. Ultimately Classics stay in :)