DCA E3 are the best closed backs I’ve ever heard, but they lack the strengths of closed backs. Treat them like a pair of good open backs and you’ll be happy, if you expect that cozy resonant bass in typical closed back fashion or a veritable intimate globe/wall of sound, you will be disappointed.
They have 1 special strength that open backs don’t have, a little (very little) isolation and a pitch black background, for better and for worse. I find when music isn’t playing there’s almost a vacuum feeling from the lack of sound, like ANC but it doesn’t actually dampen that much from the outside, only the inside-out.