I've played an outdoor event with a rented PA (consisting of EV tops and two 2x18" subs iirc) and it would've been loud enough for 200-300 people.

My passive rig which was 15" tops and a 15" scoop could barely do a crowd of 100 or so outdoors, the 8" tops/15" sub active rig which I used on a beach party for about 50-100 people once wasn't near enough but did ok nevertheless, although running it at full tilt isn't smart in the long run.. the current 8" tops/12" sub active rig is fine indoors for a crowd of ~100 but not so much outdoors, but it's lightweight and highly portable.