I bought 4 of these from Sweetwater two weeks agony and I am completely blown away by them. Maybe the best $3000 I have ever spent on my rig. I was originally going to buy a pair of Peavey SP218 subs because I had heard them recently and was impressed. Sweetwater was out of the SP218 and I needed them THAT DAY because of an unexpected emergency, so I bit the bullet and spent the extra $1000 on the PRX418S. I was a little disappointed because I never imagined that the $1000 would be such a difference. Man am I glad that I was forced into spending that extra $1000! I've used them twice... Once with a quite indoor setting (not a loud rock band) and they had such smooth bottom end that made my mouth water and they gave you punch that you could feel without being loud at all. The second time was at an outside 1000 person gig with a loud 80's rock band and they kicked butt. 4 of them powered by a 3000w QCS RMXa4050 amp was more than enough low end to fill the entire place. HIGHLY RECOMMEND!