It takes more than just a big enclosure to make a good sound. Even if it didn't, a 1084 monitor case cant exactly be called a brilliant speaker/subwoofer enclosure. Everyone would laugh if a company brought out a pair of speakers in a case like that.
I still disagree with your comments about low quality music sounding worse on a good system than a cheap one. You can't honestly believe a monitor can sound better than these:
Lastly, listening to loud music is not harmful in short bursts. I do not do it 24 hours a day. I was born half deaf, but I do believe I have a good ear for sound quality.