3-piece boxes usually have more bass than 1-pieces, but most of them have very weak mids, and just can't project high volume over a long distance. Take the Telefunken for instance, it's my best-sounding box, absolutely fills a room with warm bass, but if I took it outdoors you'd have to be within 100 feet to hear it.
Maybe the WX1 is an exception, but I kinda doubt it. I bet an M70 could be heard at a greater distance.