Celestion G12M (55) Blackback 15R

Celestion T1511 Blackback – Legendary 70s Tone with the Classic 55Hz Bass Cone

The Celestion Blackback is a faithful recreation of one of the most sought-after Blackback speakers of the 1970s. Based on the iconic G12M design with the renowned 55Hz bass cone, the T1511 delivers the rich, expressive character that helped define countless classic rock recordings.

Closely associated with players such as Free’s Paul Kossoff, whose famously sweet sustain became a hallmark of his sound, the Blackback captures the essence of classic Celestion tone. Combining punch, sparkle, and an unforgettable midrange character, it offers the warmth and musicality that vintage enthusiasts continue to seek out decades later.

Features

• Authentic recreation of the legendary T1511 Blackback
• Classic 55Hz bass cone for fuller low-end response
• Rich and expressive midrange character
• Ceramic magnet construction
• 25W power handling
• Perfect for classic rock, blues, and vintage British amplifier tones
• Available in 8-ohm and 15-ohm versions

Tone and Performance

The T1511 is defined by its warm, harmonically rich midrange and smooth, musical response. The famous 55Hz cone provides deeper bass extension and greater low-end authority, while the top end remains clear and articulate without becoming harsh.

This combination delivers a highly expressive playing experience with outstanding sustain, making the speaker particularly well suited to vintage rock lead tones, dynamic blues playing, and crunchy rhythm sounds.

Specifications

• Nominal Diameter: 12" (305 mm)
• Power Handling: 25 W
• Rated Impedance: 15 Ω
• Sensitivity: 96 dB
• Frequency Range: 55 Hz – 5,000 Hz
• Resonance Frequency (Fs): 55 Hz
• Chassis Type: Pressed Steel
• Magnet Type: Ceramic
• Magnet Weight: 0.99 kg (35 oz)
• Voice Coil Diameter: 1.75" (44.5 mm)
• Voice Coil Material: Round Copper
• Overall Diameter: 309 mm (12.2")
• Cut-Out Diameter: 283 mm (11.1")
• Magnet Structure Diameter: 150 mm (5.9")
• Mounting Hole Diameter: 7.9 mm (0.31")
• Mounting Hole PCD: 297 mm (11.7")
• Number of Mounting Holes: 4
• Overall Depth: 130 mm (5.1")
• Unit Weight: 3.6 kg (7.9 lb)