The Revelator woofers and subwoofers features very rigid cones in paper or aluminium that operates as a piston over a wide frequency range, in combination with Scan-Speaks low-loss linear suspension and the patented Symmetrical Drive (SD-1) it results in very low distortion and a smooth and well behaved frequency response as well as perfect transient reproduction.
Datasheet: Datasheet 26W/8867T00
Size (inches): 10
Fs (Hz): 19
Re (ohms): 5.8
Sensitivity (dB): 87
VAS (ltr.): 176
Xmax ± (mm): 9
Here you can soon find DIY kits for this driver.