These are technically semi-open, but sound more closed than open. Soundstage is a bit narrower than on DT1990. Also, AK T1p is easier to drive and significantly brighter. Soundsignature has a more pronounced V-shape than the DT1990. If you find DT1990 boring, you may enjoy the livelier AK T1p. However, if you are sensitive to sibilance and have a decent amp, DT1990 is hard to beat at around $500.