Would a Behringer PMP 5000 be compatible with my 2 Carlsbro Delta 15s (400w each)?
Sure, though there’s a chance you’ll need a connector to bridge outputs. By the way, ignore the 1200w figure on your Behringer mixer. It’s only good for 215 watts per channel at the 8ohms your speakers have for resistance, and given its much higher output at 4ohms watts, I question the amp’s durability in general. Behringer isn’t always awful, but $550 is probably too much to spend with them. Maybe just grab some 1980’s road dog Peavy off Craigslist for $100-200? At least it can be fixed, and will do its output to the letter and then some. Also, 100 watts per channel is enough for a VFW show or wedding part provided your speakers are efficient, and yours claim 95DB, so they are. Don’t worry about finding over 200wpc, honestly.