Just joined the Beyerdynamic camp a couple of hours ago.
Got myself a pair of Custom One Pro from amazon and I'm breaking them in now.

I must say, even out of the box, they sound great. I have my bass setting set to 1/2 and they give good punchy detailed bass and good soundstage. Can't wait to hear their full voice after 30hours of burning in.

do note velour will be like "bass reduction pad" for COP, it will lose certain amount of bass

sold my dt770 keep my COP, that's my answer

amping on any headphone brings significant changes, now lets put this fact aside

dt770 has some sharper trebles but in comparison, COP has a smoother treble

the amount of bass in dt770 varies among ohm version, i took 250 so it requires quite some juice to have it sing, COP has no problem and is very amp- friendly

the only dt770 that pro reviewers think is a keeper is the anniversary edition 32 ohms

besides, who doesnt like the COP bass adjustment, it's just plain fun to have it

For sound staging and accuracy, for my opinion, DT770pro provides much better on that part.
COP able to offer fun adjustment due to the bass adjustable feature.

However COP is efficient, and you don't really require much power/amplifier to drive it, while 770pro really depends on the impedance you get, 32, 80, 250 and 600.

For 80 and above, amplifier is necessary for maximum sound potential.

try to get a benchmark by playing on youtube perhaps? or even download/rip a copy, or even better, play on the CD?

Sounds like source problem. COP supposedly can handle human frequency range.

get a schiit modi+magni (M&M) and you are good to go

If you are at Tesla... you might need to consider other options other than E17

hi guys. any idea where i can audition the Beyer DT990 premium?