yea I can understand it can sound bad to you at that moment, no question on that side, but it can only be discussed further with say in room data or even what song did you listen to at that day, it could be the room, the music, defective speaker or even some extra EQ based on the stereoplay measurement, if say, no in room measurement and comparing in other room or setup, it can't be even remotely single out what is right or wrong, say for example, there are Behringer B2031A amirm measured being the speaker itself being broken.
Just saying if in room response is measured and available, you can at least see it's either you just don't like the speaker in the room or it have something broken in the setup, say a damaged woofer.