The WayBack Machine has info on the Celestion 11 and other speakers from the day:
https://web.archive.org/web/20000831004615/http://www.celestion.com:80/museum/celestion.htm
Celestion 11
Technology and style combine beautifully in the three-way Celestion 11.
Again using Celestion's celebrated 1" (25mm) titanium dome tweeter and the same technically perfected 4�" (110mm) mid-range unit as the Celestion 9, the Celestion 11 stands apart in powerful performance thanks to a specially designed 8" (200mm) bass unit
Using a new surround which perfectly terminates the felted fibre cone, a motor with a long throw voice coil system, high temperature capability and reflex type bass loading, the Celestion 11 ensures high power handling with low distortion.
And with its front edge chamfering, low diffraction grille and new fixing module, the Celestion 11 looks as powerful as it sounds.
Capable of handling 120 Watts, it's a sophisticated addition to any sound system.
Celestion 11 Technical Specifications
Frequency Response 50 Hz - 20 kHz (+-3dB)
42 Hz at (-6dB)
Sensitivity 89dB SPL 1 Watt/1 m (free space conditions)
Power Handling 120 Watts programme
Amplifier Requirements 10 - 120 Watts (continuous sinewave output)
Drive Units 1 x Celestion two-piece titanium dome tweeter 25mm (1")
1 x Celestion mid-range unit with treated cone in self-contained enclosure 110mm (4.5")
1 x Celestion bass unit with felted fibre cone 200mm (8")
Crossover 9 element, 1 kHz 2nd order high and low pass
4 kHz 2nd order high and low pass
Cabinet 15 mm high density particle board. Vented box system turned at 45Hz
Internal Volume 29 litres
Terminals 4 mm socket binding posts (colour coded), also accepting bare cable connections.
Impedance 8 ohms
Finish Simulated Oak and Black Ash veneer
Height x Width x Depth
567 x 245 x 305 mm
(22.3 x 9.6 x 12 inches)