Real TSP's for this sub are:
Re = 3.1166 ohms
Fs = 27.5399 Hz
Zmax = 26.1917 ohms
Qes = 0.8713
Qms = 6.4508
Qts = 0.7676
Le = 1.1552 mH (at 1 kHz)
Diam = 206.3750 mm ( 8.1250 in )
Sd =33450.6109 mm^2( 51.8486 in^2)
Vas = 28.5486 L ( 1.0082 ft^3)
BL = 10.7285 N/A
Mms = 185.9532 g
Cms = 179.6025 uM/N
Kms = 5567.8506 N/M
Rms = 4.9881 R mechanical
Efficiency = 0.0643 %
Sensitivity= 80.1007 dB @1W/1m
Drop this in 3 cubes Sealed/Stuffed and the SQ is very good, same basic sub as the 2nd Gen TC LMS 4000's I currently own both and ya cant tell a difference in SQ other than the 4K's seem to be a lil more transient (prob just because their Qts is lower from being broken in) Hope this helps and GLWS!