True they can, I do enjoy the HD 600 quite a bit on a nice amp for instance. Though the HD 600 is one of those exceptions I mentioned, I actually like more with extended ownership and I don't get sick of them. Haven't heard an HD 580 in years. I could never get all that engaged long-term with the HD 650, 660S, 660S2, 620S, or HD 560S (original version, not sure about it's revision) regardless of amp though. Though I've basically replaced the HD 6xx line with the Focal Hadenys as I like that headphone more.You can get the Senns to be lively, but you need a good amp to feed them. The balanced out on my Liquid Platinum makes my HD-580 step up in their performance.
Curious about impressions of the Hadenys compared to the DT 1990 Pro MKII as they are in a similar price bracket, has a rather neutral tuning, and have a similar impedance.
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