Over the past few years researching headphones, amplifiers, and audio equipment in general, I've developed a couple of curiosities about headphone amplifiers.
While I understand that certain combinations of headphone and amp go well together, it's often hard to figure out the degree of how well they go together. Especially in the Texas Panhandle, where it's quite unlikely to ever hear any combo without first buying it. So, as I do research on head-fi, I have this dilemma: separating the subtle improvements from the large ones. I feel this question is relevant as much now as ever, what with the introduction of the Schiit Vali and the claims that it can match qualities found in megabuck amps.
In short, what headphone/amp combinations (of any price range) have you experienced that were truly, unmistakably stunning, and not just subtly better?