I want to upgrade my Audio Engine D1 to something nicer. I'm currently using the SeinheisserHD650 and the audio technica M-50. The HD650 definitely needs some sort of amplification.
Can you recommend me a good one? I would like both USB and optical input, 2 headphone output jack is a want not a need. If you have more than one to recommend even better. Thanks, I've been poking on eBay for some South Korea models, but I don't know which to get