The smallest lightest sub I've ever had the pleasure of lugging in and out of car/venue!
We bought it to use with RCF710a tops for our 3 piece band and they pair up well. It's loud and punchy as hell. We are planning on buying another because in large venues it can get a bit lost, but with the size, weight and price we really don't mind.
The sound is tight and focused, without being ribcage shattering. Probably not ideal for DJ's or electronic music, but great for kick drum and bass guitar to add a little more low end thump. Crossover seems to be set perfectly at 100hz although you can't alter the frequency unfortunately.
Two drawbacks that we've found - the finish chips easily, ours is looking a little beat up after a year of use. And it's too small and light to be a base for any heavy tops, as it's designed to be used with the EV ZX1a which is an 8" cab.
I have a Electro Voice set ( two ZLX12P and one SUB ZXA1). Sound is very clear. Sub sound is nice soft. With out problems I use this set in party 150 people. At full power speakers show overload, but the sound quality does not change. For me as a mobile DJ, this is a great set of small size, lightweight and powerful enough. I am more than happy with this purchase.