Hi all! I have in mind a 2.5 cubic ft sealed box for my Tumult and the QSC PLX2400. BUT, WinISD Pro and BassBox Pro 6 dont give me the same Qtc value. WinISD Pro gives me a Qtc of 0,66 and BassBox Pro 6 gives me a Qtc of 0,6. In both programs, the Qa=100 and Ql=10. If BBPro6 is right, a 2 cubic ft box would give me a nice Qtc of 0,65 , the box would be smaller and it would be nice. The Xmax around 20 Hz would be safer with that 2400W amp according to BBPro. Second question... Is 3/4 inch thick plywood is enough for the enclosure? I often see people mentionning that we should use 1.5" of MDF for the enclosure walls, ore double walled 3/4" of MDF. I saw in one post somewhere that 3/4" of baltic birch ply can be enought because that material is more rigid. Third question... do I need "special" binding post because of that powerfull amp? Gold plated I imagine... But I dont see any power rating when I look at some binding posts. For example: a binding post "A", power rating: suitable for 5 to 10A of current.