So I'm toying with the idea of a new amp to drive my Sennheiser 650's -- I have an old Audio-GD Compass right now.  From what I can tell, an ODAC/O2 combination is probably pretty hard to beat with anything less than $500, and as a professional scientist I like things based on numbers.  ...

Hey folks,   I'm using some M50's with my computer's 3.5 mm output at the moment, but am feeling the need (desire, really, but whatever) for something a bit more advanced.  To wit:  an open headphone, and a proper DAC/amp of some sort.   On the headphone front, I love the M50's, but I do...

Right, so, I've lurked a lot here and still can't make up my mind!  I'm looking at buying my first good headphones, to use with my unamped Sansa Fuze.  The budget is around $100 (Canadian).  It seems that a lot of people think highly of ATH-AD700's, and also the Alessandro MS-1's.  I've also...