Celestion Heritage Series G12H(55) Guitar / Bass Speakers 15 Ohm

Celestion Heritage Series G12H(55) 15 Ohm — Late-60s Rock Guitar Tone Reissue

The Celestion Heritage Series G12H(55) 15 Ohm is a 12-inch guitar loudspeaker and a faithful re-creation of the late-1960s G12H "Greenback" that powered classic rock. Built around the 55c/s "bass" cone, it reproduces the thick, syrupy character of Hendrix-era tone. In a 4×12 cabinet, it pushes towering power chords forward with a deep growling low end, a densely layered midrange, and a finely detailed top end. The 15 Ω impedance suits vintage Marshall and Hiwatt stacks.

Faithful Re-Creation of the Original 55 Hz G12H

What separates this driver from modern G12H variants is the 55 Hz "bass" cone — the same resonance profile Celestion used in the original late-60s pulsonic-cone Greenback. A pressed-steel chassis with a 1.42 kg ceramic ferrite magnet and a 44.5 mm voice coil delivers the dense midrange complexity collectors chase. The 100 dB sensitivity keeps output strong from low-wattage tube amps.

Electrical Parameters — Impedance, Sensitivity, Power

Electrical parameters target vintage-style tube amplifiers.

• Rated Impedance: 15 Ω — matches vintage Marshall and Hiwatt wiring
• DC Resistance (Re): 12.11 Ω — confirms the 15 Ω voice coil winding
• Sensitivity: 100 dB
• Power Rating: 30 W RMS — handles 30W class A/B combos and small heads

Driver Construction — Cone, Magnet, Voice Coil

Mechanical assembly mirrors the late-60s original.

• Magnet Type: Ceramic ferrite — delivers the dense, weighty midrange of vintage H-series drivers
• Magnet Weight: 1.42 kg / 50 oz
• Voice Coil Diameter: 44.5 mm / 1.75 in — classic G12H coil size for vintage tonal balance
• Resonance Frequency (Fs): 55 Hz — the defining "bass" cone profile that gives this model its name

Mounting Dimensions — Drop-In Replacement for 12" Cabinets

Standard 12-inch frame fits any 4×12, 2×12, or 1×12 cabinet.

• Nominal Diameter: 305 mm / 12 in
• Cut-Out Diameter: 283 mm / 11.1 in
• Mounting Hole PCD: 297 mm / 11.7 in — 4-hole bolt pattern
• Overall Depth: 135 mm / 5.3 in — fits standard combo rear panels