Some info about this speaker:
The Seventy 80 is detailed and crisply defined, with a tightly controlled low-end and punchy, aggressive upper mid-range. The top-end response is also subtly increased. Used singly, in pairs or quartets – it is capable of reproducing a wide range of sounds and styles whilst adding the undeniable Celestion character to any amp.
http://celestion.com/product/22/seventy_80/
Nominal diameter12", 305mm
Power rating80Wrms
Nominal impedanceAvailable 8Ω or 16Ω
Sensitivity98dB
Chassis typePressed steel
Voice coil diameter1.75", 44.5mm
Voice coil materialRound copper
Magnet typeCeramic
Magnet weight31oz, 0.88kg
Frequency range80-5000Hz
Resonance frequency, Fs85Hz