I know this has been beaten to death BUT,
I have a old BA115 Ampeg and need to step it up to more power. I'm looking at the PF500 and wondered what cab to get. We are all old classic rockers and play a lot of outdoor gigs. Some festivals have back lines but some do not. Our drummer is loud and the lead guitarist can't hear anymore( remember , we are old rockers).
So 1X15 2X10 or 4X10 remember we're a classic rock cover band..
Thanks
If you want to stick with the PF series, I'd get two 115 cabinets, use one for smaller gigs, and stack both when you wanted full volume.
Just me, but I'm not a big fan of mixing a 115 and a 210 cabs because it can do funny things with the sound (hot spots and dead spots in the room for example) although it does work for some folks and who am I to argue if it works for them.
I'm also not a fan of 410 cabs in general because even though they're loud for their size, they're heavy and wide and just tend to be all around back breakers.
I'd rather tote two 115s, have that second 115 close to my ears.
Of course, YMMV, IMO, etc.
Also be aware there are two different Portaflex 115 cabinets, one has the removable top to mount and flip your amp (PF-115HE), the other is a traditional 115 cab that doesn't open up (PF-115LF).
If you want your rig to be a true fliptop, the choice is obvious, but there are folks who say the 115LF sounds better.
I don't have experience with either, depends on how you want to use your head or which one your ears prefer.
If you're not set on the PF series, or even Ampeg in general although
Ampeg makes a perfect candidate, I'd look at a couple of 12" cabs for the same reasons as the 15" cabs, they would have most of the volume and all the tone and be a bit easier on your back, generally speaking.
Good luck.