Disclaimer: This is my first set of headphones since my days of the walkman in the 80s.  I am a bit of an audiophile and I have a pretty capable system for vinyl and CDs/hi-rez audio.  I bought these for use on my computer for editing my vinyl rips.  I have a Schiit Modi 2 Multi-bit DAC and a Schiit Valhalla 2 tube amp powering these.  They're very decent pieces of equipment.  Anyway, I would just say that my impressions of headphone listening differ from many.  You don't get a "soundstage" like you get from speakers.  The sound is literally in your head.  And if the imaging is well placed, it's BEHIND your head.  It's just....weird.  And a$$-backwards.  But that in and of itself is not the fault of the HD600s - at least I don't think it is.  What is it's fault is the lack of bass.  I'd read some amazing reviews about how awesome the bass was through these.  I mean, they do kick a little, but they just don't extend nearly as low as I would have expected.  Also, the highs are a bit bright for my tastes.  If I crank them up, every cymbal crash has me reaching for the volume knob FAST.  I love the sound of crash cymbals (I played drums for 15 years growing up, so I know how cymbals should sound) but these make them unbearable in their bright attack.  The reason I'm so hard on these is I literally have better sound listening through my (cheap) Creative T40 speakers.  Yes, they lack lack the bass (it's actually teri-bad).  But the mids and highs far exceed the capability of these headphones.  And with the Schiit, they make them the schiit!  A huge jump up in accuracy from when I had my Creative Audigy Sound Card doing the DA conversion.  The Schiit took a $125 pair of speakers and made them sound like $500+ speakers.  Imaging is very 3D, the sound fuller and the timbre of instruments is almost laughably good for such a cheap pair of speakers.

I compared my SACD layer of Bowie's Ziggy Stardust this weekend.  And the punch of the kick drum and slam of the snare on "Five Years" were much more involving through the T40s.  But what the deal breaker was is the timbre.  It sounded much more natural through my T40s.  The HD600s added an edge to it all.  Like enhanced (fake) treble.  It was very disappointing.... Each song had the same kind of traits.  All were too treble-boosted through the Sennheisers.  But in fairness, the bass was much better through them.  Although not deep.  I could go on and on but I'll quit here.
Disclaimer: This is my first set of headphones since my days of the walkman in the 80s. I am a bit of an audiophile and I have a pretty capable system for vinyl and CDs/hi-rez audio. I bought these for use on my computer for editing my vinyl rips. I have a Schiit Modi 2 Multi-bit DAC and a Schiit Valhalla 2 tube amp powering these. They're very decent pieces of equipment. Anyway, I would just say that my impressions of headphone listening differ from many. You don't get a "soundstage" like you get from speakers. The sound is literally in your head. And if the imaging is well placed, it's BEHIND your head. It's just.... weird. And a$$-backwards. But that in and of itself is not the fault of the HD600s - at least I don't think it is. What is it's fault is the lack of bass. I'd read some amazing reviews about how awesome the bass was through these. I mean, they do kick a little, but they just don't extend nearly as low as I would have expected. Also, the highs are a bit bright for my tastes. If I crank them up, every cymbal crash has me reaching for the volume knob FAST. I love the sound of crash cymbals (I played drums for 15 years growing up, so I know how cymbals should sound) but these make them unbearable in their bright attack. The reason I'm so hard on these is I literally have better sound listening through my (cheap) Creative T40 speakers. Yes, they lack lack the bass (it's actually teri-bad). But the mids and highs far exceed the capability of these headphones. And with the Schiit, they make them the schiit! A huge jump up in accuracy from when I had my Creative Audigy Sound Card doing the DA conversion. The Schiit took a $125 pair of speakers and made them sound like $500+ speakers. Imaging is very 3D, the sound fuller and the timbre of instruments is almost laughably good for such a cheap pair of speakers. I compared my SACD layer of Bowie's Ziggy Stardust this weekend. And the punch of the kick drum and slam of the snare on "Five Years" were much more involving through the T40s. But what the deal breaker was is the timbre. It sounded much more natural through my T40s. The HD600s added an edge to it all. Like enhanced (fake) treble. It was very disappointing.... Each song had the same kind of traits. All were too treble-boosted through the Sennheisers. But in fairness, the bass was much better through them. Although not deep. I could go on and on but I'll quit here.