I have mailed KEF and receive a PDF. I can not Upload it but I can provide the parameter: SP1330
Frequency Range: 20Hz-2.0Khz
Sensitivity 1W/1 Meter:90dB
Amplifier Requirements:12 W min
Outside Diameter 216mm/8.5"
Hi Rod, are you still using the KEFs? IIRC I saw on TA that you'd gone for some Hybrid 8"? If you still have the KEFs I have woofertester and can pull the specs off them for you. Off to China for a few weeks, but can do on my return