After being done with the Radio Shack "kid stuff" (late 60s) and only having one real human source for advice. The guy was a neighbor and an EE and had a single Klipsch Klipschhorn driven by all mono Mc gear. Fat story slim...he advised buying the very best speakers you can and work backwards to the source (remember it was only LPs, radio and tape).
I took his advice and a few years later bought a pair of Hartley Reference loudspeakers and I still have them (tri-amped). Went through Sansui amps, David Hafler amps, ARC amps and landed on Pass Labs amps with a Ref6 about a year ago. Took a while to climb that ladder, but I'm glad I did it that way.
For you friend's son: Look and listen for a long time and purchase the speakers you love. They will not disappoint.
PS. Those Hartleys cost $10K back then and everyone thought I was bonkers, crazy, irresponsible and insane. But I'm still smiling.
Regards,
barts