Hi. The library at my college has Sennheiser HD 545 and I really like their open airy sound. What headphone should I get under $100 that is similar to Sennheiser HD 545 Reference?
Also, what is the best USB sound card under $50?
I had some 545's back in the late 90's before I upgraded to the 580's, which sounded the same, but with more detail. For under $100, I would suggest the 558's if you can get a deal, but I haven't heard them personally. I do have the 598's and I feel they are similar enough to recommend.
Sennheiser HD 380s come kind of close. You might find a used pair for under $100. A little less bass, perhaps a smaller soundstage but I love mine. I just bought a used pair of 545s today and the comparison is fresh for me.