I did not want to hijack that other guys post so I made this one. I looked at that site for them Stryke subs you put up. The 15's have and Fs of 16Hz!!! I seen that and I was like jesus is that low. How do they sound? I mean you can not beat the price. Do you know anything about the componants they sell. I seen the have a 7 inch midrange. Ps - thanks for the comments about knowing the Thiele/small parameters thing. Hope you guys don't mind me sharing some of what I know and asking what I don't know yet. I have competed for about 3 years now, but I think I just want to enjoy car audio now.