Today has been a busy day. I got the ESP 950 this afternoon. plus I got my old Mad Dogs back with the upgraded Dog Pads. plus I got the Schiit Gungnir DAC! phew!
So, to speak very briefly about the 950, my first impressions are incredibly positive. They are exactly what I was hoping for. They have a slightly darker presentation than most high end headphones I've owned. They're not as dark as these new Mad Dogs or the Audeze cans but they don't have a highly tipped up treble either (eg: HD800 or Q701). I can hear that slight upper-mids focus that milosz talks about. When comparing to the Mad Dogs, it does seem a bit brighter. But it's not excessive. My tests tracks for nasty glare and treble shrillness don't make me wince at slightly above average volumes.
They throw a very nice, open soundstage. It's not HD800 sized but it certainly sounds nice and expansive with good height and 3D depth.
As expected, they are very detailed and don't mush together instruments. Very clean, very nice. And the bass really does hit quite hard. A nice surprise. (I remember that one of the issues I had regarding the SR007 was a slight lack of bass slam. I couldn't get that dynamic punch running them from a GES or 323S. And a BHSE wasn't in the cards)
My only complaint about the setup is the dual volume knob on the E/90. the left and right channels don't lock together like on Stax amps so I need to grip both firmly and turn. If I'm lazy about it, I'll end up adjusting just one channel and not the other without wanting to.
I really love the Mad Dogs and the 950 are, I believe, an improvement on them in most areas when I listen to tracks back to back. Larger soundstage, subtle details in the back of the mix or off to the sides become more clear with more subtle detail being audible, there's a bit more clarity and life to vocals.
As someone who believes the Mad Dogs are amazingly good for their price, I'm glad that the Koss didn't disappoint. (I've owned other $500+ headphones that I've felt are bested by the Mad Dogs) They're more expensive but not drastically so and offer the kinds of improvements I was looking for. Oh, and the comfort is quite good too. better than the SR407 for my head - they exert less pressure on my cheeks and in front of the ears.
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