I saw a Kansas show a while back, Billy Greer had 2 PJ stacks on each side of the drum riser, I wasn't impressed with his sound
although he played well.
Speakers that small to me just don't sound good for bass.
for something small, I would use a single 15, a 2-10 or maybe a 2-12 cab, not sure who makes the lightest cab with the best lowend, for rehersals and some small gigs my Super Redhead handles a low B well, but its not that light....Rich what size speakers does your Rick Combo have in it ?............with the weight of an amp + a cabinet what's out there thats alot less than 70 lbs?
B.