RT800i sounds muddy

Hi everyone. I recently picked up some RT800i's from FB for 70 usd. One of them has a broken tweeter, but other looks fine cosmetically. Even with the broken tweeter one ("right speaker") disabled, the other ("left") speaker sounds very muddy. I have to turn the treble up (a lot) on my amp for it to sound "normal to me" - comparable to my Koss KSC75's for example, but I don't really have anything else to compare to. Is this normal (and maybe just my personal preference) or is something wrong?

Thanks so much!

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