hi wayne i recently picked up a pair of 604-8g drivers. they were originally in 3.5 cu ft vented boxes designed for soffit mounting andn in free space the bass rolled of starting at 150 Hz. any suggestions as to a pi aligned box. i'm thinking of a ported design in the corner. t/s parameters are as follows for the 604-8g fs: 28 Hz Re: 7 ohm Qts: .25 Qms: 8.3 Qes: .26 Vas: 624L Xmax: 3.8mm