if im not mistaken there the same thing. ones round ones square. i havent look vat the cvx to much so, correct me if im worng.
i do have an L7, its sound decent. its in a 2.5 cubic foot box tuned at 35Hz. now, when in a small sealed it wasnt loud but sounded decent. i heard an older model in a bigger sealed box and, it got got decently loud just nothing like the ported.