I have both the Denon D2000 and the Beyerdynamic DT770 Pro 250 ohm version. My opinions are based only on the 250 ohm version; there may be some difference with the lower impedance version of the headphones.
Originally Posted by solidsnake
I want a headphone with defined bass and big impact (consider me a basshead). Glassy, slightly rolled off highs (I am very sensitive to sibilance and piercing highs). Overall detail, clarity and a wide soundstage.
I think this pretty much defines the Denon D2000 IMO. Particularily the slightly rolled off highs. I seem to be very sensitive to excessive high end and the Denon is the perfect amount; it is not too veiled to obscure detail, yet is rolled off just enough to not bother me, and allows for longer listening sessions.
The only thing I would say doesn't fit your description with these cans is the soundstage. Not that it is extremely closed or anything, it's just not super wide IMO. Of course that's compared to my AKG 501 and Sennheiser HD600s. However, it is wider than the DT-770 Pro (I have the 250 ohm version)
Originally Posted by AtomikPi
...in my opinion the Denons are noticeably better due to their less recessed mids. The 770's heavy a quite strong v-curve frequency response.
Absolutely agree; vocals and midrange instruments disappear with the DT770.
Originally Posted by Mochan
Can't agree with that, he wants slightly rolled off highs and the DT770s have piercing, strident highs.
I also feel the highs are a bit overbearing on these phones. This very well could be the effect of the recessed midrange overemphasizing the high end (a hole in the frequency spectrum usually makes the neighboring frequencies appear more prominent). Regardless, it does not sound very natural.
Bottom line: my Denon D2000s are my go to "fun" cans for rock, metal, electronic and R&B. The bass is great, and they just always seem to get me moving. A word of warning, they are a little on the slow side when it comes to the bass (compared to say Grados for instance, which are extremely fast and tight). This can sometimes makes them appear a bit sloppy and "boomy" depending on the track. But if you are a basshead, this probably won't bother you too much. It doesn't bother me at all, because the impact of the bass trumps any of the transient response issues for me personally. A really good amp helps a lot with this too.
They are also not as detailed as my HD600s, but the additional bass makes up for it if you are looking to rock.
The only reason I am keeping my DT-770 Pro is because they are built like tanks, and they isolate really well (the Denons don't really isolate at all for closed cans). I use them in the a live sound environment, where I need to isolate individual instruments from the room...which is usually only for a moment. They are definitely not reference cans, and I don't really use them for any home listening. Industrial / electronica are probably the only genres I find exceptable on these cans, and I will usually reach for the Denons long before that.
My $0.02, hope this helps.