Beyerdynamics DT 1770 pro bad sound quality?

Hey i just got myself a brand new DT 1770 pro to replace my 8 year old audio technica m50x’s, i have to say i was expecting alot for their price but i wont lie i got disappointed from the sound quality allmost immediately, its no where near the m50x’s IMO, the sound just sounds washed, now its important to know i dont have an amp/dac, from what i heard these dont realy need it and my pc gets them enough power (they get pretty laud) so idk what im doing wrong here, i realy dont wanna think that i just wasted 600 usd for nothing, any suggestions for what i might doing wrong?