I have two sundown audio sa-10s that i'm not to happy with. They're not getting very loud at all off a saz2500d and i think my box is to blame. I designed and built the enclosure myself, its suppose to be 2.5cubes after displacements tuned to 32hz but not sure how well that worked out. Im at the point where i'm considering selling the 10's and upgrading to 12's or a single 15 cause i'm frustrated with how they sound. I can try a new box but would hate to put the time and money into it if thats not the problem. Current box dimensions are 30x20x14 exterior and the port is 3x12.5x31. I would greatly appreciate some help on my situation, thanks in advance. My old system was a 15" Fi SSD in 4 cubes @ 32hz off a memphis mc1000d and it was noticeably louder.