Specifications:

Two way passive loudspeaker with bass assist design
Frequency response: 45Hz to 20KHz
Maximum power rating: 150 Watts
Minimum power rating: 25 Watts
Nominal impedance: 6 Ohms
Sensitivity: 90dBA (SPL 1W at 1M, 2.83V)
Maximum Output SPL: 111dB
Crossover Frequency: 2100Hz
Tweeter: 25mm Ferrofluid Soft Dome
Woofer: 4 x 130mm paper cone with rubber surround
Connectors: screw-down terminals / 4 x 4mm banana plug
Wiring: Bi-wire or bi-amplified or single wire with pin links
Finish: black ash veneer
Enclosure: 34 litre, sealed with bass assist
Dimensions: 208 (w) x 875 (h) x 315mm (d)
Weight: 22.5kg (each)

http://www.hifi-review.com/153625-mission-753.html

Reclaimed spares available:

single empty cabinet (no grille) £10  

Mission domestic hi-fi loudspeaker