Joined the recent drop and received today at the front door, serial number in the low 6 hundreds for some reason I don't know why.
No quality issue here, matt blue cups, cable is thick and soft, plugs are secured, headband have support, except I haven't popped the hood to check the wiring.
Out of the box pretty nice sound straight from the mobile phone (double as my DDAPP Daily Digital Audio Portable Player), although a bit power hungry (dial up to about 80%), but less than T50rp MK3 or K712 (push to 90%, have volumn although not good pairing) but more than HD6xx (60%).
Details are close to DT880 and still have good bass like HD6xx without the veil so-to-speak.
Now pairing with Magni 3, good synergy, high gain at just shy of 3-o'clock. Album is Lion King (Legacy collection) and PTO 1986 recording in VBR mp3.
citizenPaulI think some user reported one side of the plug/ connection is loose, my copy doesn't appeared to have the said issue. When the 2.5mm TRS and socket make contact, there was a definite click/s and even degree of freedom (rotation only, no excessive lateral) on both sides (Lt + Rt) once secured.
RidhoFrom my experience, it is parallel. It is comparing apples to oranges. DT 880 been around 10+ years and HE 4xx I only received <40 hrs.
From my hearing, both have excellent details, and both have the wide 4 track stereo imaging (x/y + a/b). HE 4xx have slightly more exciting top and bottom end.
Except, on a split hair level, HE 4xx sounded more 'planner' and DT 880 got an better acoustic 3D sphere imaging. HE 4xx is like digital vs DT 880 is like analog, like a warmth of 'human touch'.