I have 2 AQ HDC315's that i bought off here awhile back in one of my close friends vehicles runnin on a SAZ-3000d. i would like to swap them out with 15's that have a 4 layer coil. i did a direct swap with some BL's and had a huge gain. so im kind of looking for Bl's Q's of some 3515's. the AQ's are a 7/10 cosmetic. no marks or scuffs just the usual greenish color change of the surround. let me know if anyone is interested
