I don't know how much the crossover change would cost you, but man, if I had those amps and the Aesthetix pre (which I would love to try someday partly because of it's balanced design) I'd sure want to use them to their fullest. Again, the crossover may be the main consideration, but I'd consider getting some well made but non exotic XLR cables just to see what you think before going further. I wouldn't be surprised if even cheaper balanced cables sound better with your system than anything SE.