Input: 2.83 volts measured at 1 Meter
Birmingham 1275













The Birmingham 1275 by ToneSpeak captures the essence of '60s and '70s British rock, offering a rich, harmonically complex tone that remains balanced across the frequency range. With a punchy, well-defined low end, a warm and expansive midrange, and a high end that soars with articulation, this speaker brings both power and musicality to your rig.
Featuring a premium Kurt Müller cone, a 50 oz. ferrite magnet, and a 1.75-inch copper voice coil with a Nomex former, the Birmingham 1275 is built for both clarity and grit. Designed to handle 75 watts with a sensitivity of 100 dB SPL, this speaker ensures powerful projection and a bold presence in any mix.
Key Features:
- 12-inch (305 mm), 75-Watt power handling at 8 Ω impedance
- 100 dB SPL sensitivity for exceptional projection
- Kurt Müller cone for a rich, dynamic British tone
- 1.75-inch copper voice coil with Nomex former for durability
- 50 oz. ferrite magnet for strong, balanced sound
- Defined low end, warm mids, and articulate highs
For players who crave a speaker with punch, grit, and clarity, the Birmingham 1275 delivers vintage British rock tone with modern reliability.
sensitivity & impedance curves
Input: 2.83 volts measured at 1 Meter
Where to buy
Canada
germany
japan
general specifications
parameter | value |
---|---|
Nominal Diameter (in & mm) | 12" (305 mm) |
Nominal Impedance (Z) (Ω) | |
Rated Power IEC268-5 (W) | 75 |
Program Power (W) | |
Magnet Weight (g) | 1417 |
Voice Coil Diameter (mm) | 44 |
Sensitivity (dB SPL) | 100 |
Frequency Range (Hz) | 80 - 5000 |
small signal parameters
parameter | value |
---|---|
Resonant Frequency (Fs) (Hz) +/- 15% | 93 |
DC Resistance (Re) (Ω) | 7.1 |
Voice Coil Inductance (Le) (mH) | 0.37 |
Moving Mass (Mms) (gm) | 29.9 |
Suspension Compliance (Cms) (mm/N) | 0.1 |
Motor Force Factor (BL) (T•M) | 13.09 |
Mechanical Q Factor (Qms) | 20.81 |
Electrical Q Factor (Qes) | 0.71 |
Total Q Factor (Qts) | 0.69 |
Compliance Equivalent Volume (Vas) (L) | 40.2 |
Surface Area of Diaphragm (Sd) (cm²) | 539.1 |
material description
parameter | value |
---|---|
Basket Type | Stamped steel with black powder coat painting |
Magnet Material | Ferrite |
Cone Body Material | Felted paper |
Cone Surround Material | Felted paper with damping edge treatment |
Dust Cap Material | Open cloth |
Spider Material | Cotton |
Voice Coil Wire Material | Copper |
Voice Coil Former Material | Nomex |
Voice Coil Winding Style | Single Layer |