No, it will not sound any better. The power advantage is meaningless as the MC7300 will easily drive the Khorns into utter distortion and burst both your son's ear drums. I think a Class A solid state amp would be the way to go. Anything more than 100 watts/ch is a waste of money.
klipshorn speakers
my son has a pair of klipshorn speakers. i don't know the model name but they are pretty big. he's running a mcintosh mc7300 amp to power them.he's thinking of getting a mc602!! he likes to play his music loud! will he hear a difference with the mc602?? he found a mc602 on ebay for 7.2k! would it be worth the money to buy it???