Someone already said it man, but you really are wasting money.. The JBL is the mos effecient wooferc out of everything listed due to the dual drive system and the safest to run in a sealed application with as much xmax to boot. For an analogy It's like spending 500 dollars on shoes to see which one makes you the best basketball player.. Not gonna be much of a difference, time on the court is what you want to focus on lol. Try different boxes for your JBL, different orientations, external ports, etc. Those things are going to be a much better use of time and resources. Unless of course your only real goal is to blindly trynew product based on the opinions of others. Alot of people on this forum do that, and 3k and 12 stereos later consider themselves "knowledgeable" yet still can't create a setup they actually know they will like without guessing. If you haven't experimented with custom boxes yet then your really missig the boat. I can tell you from experience while the JBL's like a moderatly big box, they sound as good and gets as loud as really any other woofer can manage to do both at the same time, keeping cone area constant.
