With  Celestion's Blue 15 ohm G12 you will experience a glorious dampened  attack, warm lows, mellow upper-mids, and brilliant bell like top-end.
Celestion G12 Blue 12" 15 Ohm Alnico Guitar Speaker 15W
 
The world's first dedicated guitar loudspeaker and a part  of musical   history. Back in the 1950s, Celestion witnessed the  emergence of a  new  breed of musician – the electric guitarist – and  responded to  their  needs for a rugged, reliable loudspeaker by  modifying the G12  radio  speaker. The unique tonal character of the  Celestion Blue,  combined with  the valve amps of the time, helped to  define the  electric guitar as we  know it today.
The Blue found favour with notable guitarists like Brian May, due to   its  glorious dampened attack, warm lows, mellow upper-mids and   brilliant  bell like top-end. When coupled with a suitable amplifier it   evokes rich  definition and develops beautiful musical compression when   pushed.  According to tone enthusiasts worldwide, the Blue is the   benchmark for  guitar speaker perfection.
In its original incarnation as the G12 T530 it appeared in several   colour variations, but it was the Blue version, fitted as standard into   Vox AC30 amps, that secured its place in guitar tone history. The Blue   has a bright, lively character with a carefully controlled  bottom end   and shimmering highs which remains popular and distinctive to  this  day.  Loaded into a single 12" or 2 x 12" cabinet, this legendary    loudspeaker suits a wide range of playing styles.
Overall Specifications: • Nominal diameter: 12" (305    mm) • Power rating: 15 watts • Nominal impedance: 15 ohm •  Sensitivity:   100 dB • Chassis type: Pressed steel • Voice coil  diameter: 1.75"  (44.5  mm) • Voice coil material: Round copper • Magnet  type: Alnico •   Frequency range: 75-5,000 Hz • Fs: 75 Hz • DC  resistance, Re: 11.8 ohm.
Mounting Information: •  Diameter:   12.2" (309 mm) • Overall depth: 6.5" (165 mm) • Magnet  structure   diameter: 5" (128 mm) • Cut-out diameter: 11.1" (283 mm) •  Mounting slot   dimensions: 0.31", (7.9 mm Ø) • Number of mounting  slots: 4 • Mounting   slot PCD: 11.7" (297 mm) • Weight: 9.3 lb. (4.2  kg).