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B.) How do these perform with most forms of rock (Radiohead, a lot of harder stuff, some acoustic)/classical/electronic?
I am very qualified to answer this question.
You will find Radiohead to be QUITE pleasing in the HD650s, but definitely not perfect. I have mine on my head right now, running out of the gear in my signature. Radiohead is one of my very favorite bands. Here are my impressions:
Nude, In Rainbows: Easily my favorite track of all time in the HD650s. I am not kidding, this track sounds perfect in this headphone when properly amped. The opening :30 is perfectly separated and balanced, with a stellar kickdrum and rhythm that is placed optimally behind the cascading vocal harmonies. Then, all of the sudden, the relaxed bass riff kicks in, also perfectly balanced with the percussion--the bass is impactful, warm, extended, dark, and creamy. I'm serious, the instrumentation sounds unbelievable. Finally, when Thom's smoky falsetto tenor voice comes in, it is absolutely hypnotizing. When I hang out with other audiophiles, I play this song to show off my gear.
I honestly could talk about this track in the HD650s all day, and about how amazing the 650s are for
In Rainbows all night, but I would probably bore everyone to tears. Suffice it to say that the HD650s + In Rainbows feels like audio Nirvana for me, and the two compliment each other very nicely. I've probably listened to
In Rainbows cover to cover in the HD650s around
one hundred times in the 650s.
Now, to be fair
Anyone Can Play Guitar, Pablo Honey: This is a different flavor of Radiohead, and it doesn't perform as well in the HD650s. The balance is still there, and Thom's voice still sounds great, but the instrumentation becomes problematic. The hard rock and roll starts to blend, or mix together, in a not-so-nice way at the chorus. Between the heavy, watered-down hi-hat and fuzzy electric guitars, I can't really separate or detail the treble as much as I could in a Grado headphone--ah yes, here it is, that classic
Sennheiser Veil. The trade-off is that I can listen to Radiohead as much as I please without getting listener's fatigue.
I honestly could write so, so much more on the subject of Radiohead+HD650s, but I'm not sure how much you (or anyone) would care (or want to read). If you have any more specific questions about my analysis or the synergy between 650 and Radiohead, throw them my way. Glad to help.