klipshorn speakers

my son has a mcintosh mc7300! he just likes his music loud. if the recording does'nt have bass, can he just adjust the bass on his pre-amp??

Hope you're aware Klipschorn can run on as little as a couple watts, 300w of 7300 is complete overkill. I'd never like Klipschorns with high powered solid state amp, but then I'm sensitive to things like timbre, tonality. I run my highly modded Klipschorns with SET and push pull tube amps, much more sympathetic partnering imo.
I don't consider Klipshcorns to be head banger speaker, really need subs for that kind of bass. Yes, they'll get plenty loud, but might run you right out of room, in stock form they can get shouty at loud volumes. They also need proper corner placement with extreme care in getting speakers to seal with wall for maximum bass output, they also want a larger room for optimum sound quality. While I love my Klipshcorns, I'd not recommend these for what I presume you're looking for.

I sold Klipschorn for a couple of years. That treble from the horn was sword sharp,the imaging gawdawful from the extreme lack of time coherence between drivers. Just not for me, though I imagine the distortion characteristics of lower-order harmonic distortion rich SET’s probably match up well.  I can think of many other speakers with much deeper and better bass response. 

Heard a lot of people’s Klipschorns, in a lot of different rooms, even in 4 corners and even stacked, and been impressed maybe twice. It’s one of those speakers that posers buy for the name and don’t dial them in well. Shouty and piercing more times than not IMO. 

I owned them for years and really enjoyed them with all genres of music. They can be played very loud, but that's not their finest virtue. If you have the space and a good system preceding them, there will be beautiful music. Maybe not the most accurate, but beautiful.