Once again I come to the experts for rescue. My storage room sub has grown! I thought the room was only 4' deep and once I emptied it out I found it was 6' deep. This means my room volume has grown to 2385 L taking into account bracing and a port volume estimate. The questions I have are: 1) Should I do my speaker model based on the lowest flatest curve or should I take some room gain into account? 2) If I do account for room gain, are there average values to use or a formula to figure it out? My room is 16'3" x 23' 6". 3) On paper I've come up with some models that have an FB of 11.64 and an F3 of 10.57 but they are down 3db at 18hz. Another has an FB of 14.75 and an F3 of 13.3 and is only down 1.4db at 20hz. So what would be the better way to go, lower or flatter? 4) How in the world do you estimate QL? What is minor leakage at QL 5 compared to QL7 or QL10? How important is leakage in a box with 1100 sq cm of port anyway? 5) If anyone has a Fane Colossus 24 they will part with let me know. This driver gives me 100-12hz -.5 db with an F3 of 10.5. On paper it looks perfect for an 80+ cubic foot box. I haven't found anything else that is even close except the Tekton Infra 21 and I can't find any info on that except the TS parameters. The P. Audio 2450, Precision Devices 2450, and the Beyma 21L50 don't do as well as one would think in such a large volume.