I am using carrozzeria ts-c1710 and a cheap JVC 4ch amp with produce 70w rms only.The good news is that you're supposed to tune your front stage without the subwoofer on so now is a good time to dial it in. The fact that when you turn it up and it loses its composure could mean that they have exceeded their limits or you haven't found their sweet spots. This is especially true of tweeters and getting them to blend properly. What components and amp are you running currently?
But now I still feel that the sound come out from another side, is it my T/A no tune properly or my headunit is not accurate because I measure using tape measure from speaker to my ear.