eh.....how does a higher Fo affect how 'clean' a speaker sounds? I thought this had more to do with harmonic distortion and power handling....
I'd say that the 4x10 is out b/c
1. pro musicians who like the 10" sound usually have 8x10 cabs
2. 2 2x10's are easier to move around for gigs
3. lots of people prefer a 2x10 with a 1x15 (i personally do)
4. a 2x10 or 1x15 will easily work in most gig situations (if not you could use the p.a.)
A bass player in my old band had one of Alex Lifesons ealy 80's Marshall cabs and it had 4 10's i think..... it was a Guitar cab but he used it for bass..... On the back was spray painted RUSH Stage Left...... I wanted that cab but he is such a huge Rush fan there is no way he'll part with it.