Any ideas on how to fold this TH? S1 = 110 cm^2 Exp = 12.5 S2 = 30 cm^2 Exp = 344.5 S3 = 540.25 cm^2 Exp = 12.5 S4 = 600 cm^2 Driver is an 8" driver with Sd=211 cm^2 Yes, it narrows for a short length, then expands.