For outdoors, I would just get some JBL Pro speakers. I don't think extreme music clarity is the primary objective with outdoor music.
That's what I did. The JBL Control 28s. Actually they sound pretty good outdoors. And they've lasted even in my harsh salt climate. Actually after two years just replaced the first pair, have the old pair in a bag... they still work they were just rusted, think I should contact JBL? The warranty is 2 years, I might be a little over or a little under. For reference purposes, I tried all kinds of stuff before, best I could get was maybe 4 months (I'm right on a salt water bay).
Yeah, the DJ is my brother-in-law and he has the JBL Eons with the stands and Behringer EP4000 amp.
When I look these up they say that they are self-powered speakers, so why would you need another amp?
For temp use outdoors, that's fine. But, amps outdoors aren't a good mix over time. Thing with amps is they kinda last forever/a long time/don't date themselves quickly, so, why not keep it indoors so it actually does, then you have an amp for this type of thing for a long time to come. Just run two or four speaker cables and mount the JBLs. They have great output. Subwoofers outside, unless you go really big, I've found to be a waste. Better off running more of these since they go down pretty low. Also if you have a patio, mount them in the ceilings corner and you get some extra gain.

I played with this with mine and got 2dB EACH SPEAKER just basically using the top corner to create a sort of horn. And it's not a critical listening space, but, it sounds pretty good. Let's put it this way: the neighbors would be really really pissed if I cranked it up at night (lucky for them I mostly use them to play ambient type music at low volumes to try and get laid).