A couple of other units have gained my interest, not sure what would be best? the biggest issue is the room size and creating a passive sub with a high sensitivity to keep up with the CV's 103db sensitivity while giving a decent output around 20hz. Not sure how to work out what enclosure would be best?
Adire Tempest 15" (5 litre displacement) (this may also be able to be used in a 36" wide Bill Fitzmaurice THT design later?)
* Nom: 2 x 8 Ohm
* Power: 750 W
* Fs: 18.8 Hz
* Qms: 6.7
* Qes: 0.4
* Qts: 0.39
* Vas: 317L
* Sd: 779 cm^2
* Xmax: 16.4mm
* Re: 3.5 Ohms
* Le: 2.9 mH
* BL: 14.2
* Mms: 195 grams
* SPL: 89.1 dB @ 1W, 1m
And from Wembleyloudspeaker.com
B-line 600 18" bass driver, Not sure how big a a cab this would need for the best performance?
Usable Frequency: 20-hz-2khz
Power Handling(cont. RMS): 600watts
Power Handling(Peak Average): 800watts
Nominal Impedances offered: 4/8/16 ohms
D.C. resistances: 2.8/5.2/11 ohms
Sensitivity (AV 1watt/1m): 100db
Sensitivity(Peak Usable): 106db
Qts: 0.24
Q. Max: 19mm
Vd.: 814cc
Vas.: 0.53m x 3
Magnet Assemblies: 9.7kg(21.4lb)
Voice coil material: Copper HML
Voice coil former: Aluminium
Voice coil sizes: 77mm x 25mm
3" x 1"
4 layer
Chassis: Cast aluminium
Net weight: 13kg(35lb)
Shipping weight: 16kg(35lb)
M.M.D.: 140grms
B.L. Factor: 21 tesla
With this plate amp from BK electronics?
http://www.bkelec.com/Modules/bsbpv500.htm