Celestion Blackbacks are well known as 1970s variations of Greenback speakers. The reason for the change in can colour is lost in the mists of time, but arguably the most celebrated Blackback of all is T1511: the G12M with 55Hz bass cone. Inextricably linked with players such as Frees Paul Kossoff, whose famously sweet sustain lasted for miles, T1511 is the very essence of Celestion tone; bringing together punch, sparkle and a midrange you just might not be able to live without.

Specifications
12in
Diameter
8 or 15
Rated impedance
96dB
Sensitivity
Nominal diameter305mm / 12in
Power rating25W
Rated impedance8 or 15
Sensitivity96dB
Chassis typePressed steel
Magnet typeCeramic
Magnet weight0.99 / 35
Voice coil diameter1.75in / 44.5mm
Voice coil materialRound copper
Frequency range55Hz-5000Hz
Resonance frequency, Fs55