I've been looking into adding an external speaker cabinet to my early-70s Princeton Reverb. Based on what I've read about impedance/ohm/speaker loads, I can use both the internal and external speaker jacks (which are wired in parallel) as long as both speakers are 16ohm, which would deliver an 8ohm load to the transformer.
I guess my question is this: in that set-up, what are pros and cons of high-wattage speakers vs. low wattage speakers? Would there be much of a difference, tone-wise, between using two 20w 10" Veteran and two 75w 10" G10C/Ss?