Hi all, i'm currently running an SI HT-18v1 in the knockdown 4 cubic foot sealed enclosure with a dayton SPA-1000 amp. It sounds very good but output at lower volumes isn't what i was hoping for. I recently sprung for the recently in stock apollo mtm for my LCR, and i'm worried about that lack of output especially with the beefy fronts. I have not modeled it yet, but has anyone used the Cube-18 with the SI sub? 18 hz ported at the size of the enclosure would be fantastic and give me the output i seek i believe. Anyone?