I have an 05CVR154 in 6ft^3 @20 Hz, 07CVR84 in 2ft^3 @40 Hz, and 07CVR84 in 2ft^3 at 61 Hz. It has good SQ and SPL is satsfying although sometimes I want more. I'm thinking about upgrading to L5, CVX, L7, or SWR. I think I can get away with changing the 15 without building a new box. I don't...