lucpes

I already voided my warranty on my Promedia 5.1 (wired the sub speakers in parallel) - past 1 year anyway and I live in Romania so shiping back to USA is not an option. I wonder if there's any way to make the speakers to sound more bright: (altering the crossover or maybe even shortening some of the myriad resistors that lie in the amp just after the inputs). Anything I can do (don't have any tone controls on my M-Audio Delta 410)? Please don't hesitate to mail me at lucpes(at)yahoo(dot)com or PM me if replying here wouldn't be appropriate.