Ok guys ive spent all day attempting to tune my sub amp to my liking and just havent been able to get it. Equipment is as follows: ab vfl 4480, 2 12" c2 threatcon 2 D4s wired at 1 ohm, Jvc aresenal hu (i forget the model number, it has 3 sets of 4v pre outs), 4 cube box, 16 sq in of port area tuned at 32, AT wiring including rcas. I am setting my gains with a Fluke dmm, and have used multiple test tones. I set the gain with the hu volume at 42/50 I've used 0, -3, -5, and -6 db test tones. Every time i set the gains, they slam on the test tones. No matter what db level the test tone was they got down on the test tones only. After i put in a cd the subs just will not preform. If i turn the hu up a few notches (45-46) they start hitting pretty good. Its like this no matter what db test tone i use. No bass boost is being used. The bass setting on the hu is set to 0, the sub level is set to 8/8. Anyone have any ideas as to what is going on?