flip a coin If your powering both to their rms I say h2 should be louder if it has an proper install and I also vote h2 becuase it's sq will crap on a sx
for ya space, the H2 would be better for ya application. they work well in small enclosures. i'd pick the H2 over the sx anyway, but thats juss me //content.invisioncic.com/y282845/emoticons/wink.gif.608e3ea05f1a9f98611af0861652f8fb.gif