Someone was looking for RS1197 (4" fullrange, factory "seconds" of Fostex FE103) TS specs a long time ago--I hope you're still lurking around. I found some over at the full range driver forum. It's now in the archives under "40-1197s for Home Theater???"

The specs are:

Fs=85Hz
Qt=0.37, Qd=2.7
Vad=0.17 cuft (4.9 l)

I think PiAlign is having some problems with the low Vad because when I plug them in the Encl Vol=6.3 cuft and the Ideal Q=40.5!

The dimensions indicate a reasonable 0.08 cuft cab (9.2" x 6.6" x 4.5" w 3/4" wood) and 0.8" dia X 2.2" port but I'm not sure if I should trust them?!

Wayne, could you run these numbers for me? Thanks.

For those interested, another cheap full range is the Pioneer B20FU20-51FW (I got mine for $40 CND each!)
Specs:

Fs=36Hz
Qt=0.25, Qd=4
Vad=3.2 cuft (92 l)

The results in a nice 0.8 cuft cab (18.5" x 12.75" x 9" w 3/4" wood) with a 2.2"diam x 2.3" port.

I'll be finishing my Theater Seven Pi's this weekend (finally!). I'll keep you posted.

Cheers,
Jeff