Fast forward to today...I have an opportunity to actually buy a vintage pair of K 2+2 'phones. Obviously their Quad capabilities are of little importance. What I want to know is, does anyone here still have a working set, or trust their memory enough to let me know if they actually sounded good (say, in the same league as the Pro4AA)? Also, when in Stereo mode, what happens? Does it turn off the back drivers, or are ALL drivers (front and back) active (which I would greatly prefer...theoretically lower bass distortion should (could) result).
Now don't flame me. I KNOW these aren't the all-time best 'phones. I don't expect them to compete with HD-580s or 600s (my favorites today). But I DO enjoy that classic Koss sound. The fact that so many 20-35 year old Koss cans end up on Ebay is a testament to how well the damn things were built! SO, anybody got any comments on what I could expect sound-quality-wise?