If your son listens at louder than 95 dB SPL he will have no hearing to listen with by the time he's 60. Maybe he will be satisfied with that for the years of ear shattering music but in the end he will regret it. Take my word for it as a former very loud listener. No mater how little distortion there is it will ruin his ears.
which speaker to buy
my son has a mcintosh 7300 and 2002 which he want's bridge so he will have 600 watts per chanell. he likes his music loud. he likes hard rock music. what speaker should he have??? i told him that here on audiogon forum many like the klipsh speakers, old or new.