Birmingham 1275 - 12" Guitar Speaker, 75 Watt, 8 Ohm
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Birmingham 1275 - 12" Guitar Speaker, 75 Watt, 8 Ohm
Classic British rock tone, inspired by tones from the ‘60s and ‘70s.
This speaker has a personality all its own, with balance from top to bottom and rich harmonic complexity. Good punch and definition in the lows that won’t get flabby, a warm, throaty, and broad midrange, and nice grit with soaring articulation in the highs.
- British tone guitar speaker
- 12" (305 mm) steel basket diameter
- 75 watts, 8 ohm, 100 dB SPL
- 1.75" copper voice coil, nomex former
- Kurt Müller speaker cone
- 50 oz. ferrite magnet
ToneSpeak guitar speakers are the result of years and years of the deep-dive for the perfect tone. Decades of testing, field experience and conversations with elite tone-chasers have all been poured into these fine products. When you play ToneSpeak, you play the best.
Brand Name
ToneSpeak
Size, Nominal (inch & mm)
12" (305 mm)
Shape of Speaker
Round
Speaker Type
Guitar Speaker
Application
Musical Instruments
Environment
Indoor
RoHS Compliant
Yes
Nominal Impedance (Z) (Ω)
8
Rated Power IEC268-5 (W)
75 Watts
Frequency Range (Hz)
80 - 5,000
Sensitivity (dB SPL) ¹
100
Resonant Frequency (Fs) (Hz)
93
DC Resistance (Re) (Ω)
7.1
Voice Coil Inductance (Le) (mH)
0.37
Mechanical Q Factor (Qms)
20.81
Electrical Q Factor (Qes)
0.71
Total Q Factor (Qts)
0.69
Mechanical Resistance (Rms) (kg/s)
0.84
Compliance Equivalent Volume (Vas) (L)
40.2
Suspension Compliance (Cms) (mm/N)
0.1
Surface Area of Diaphragm (Sd) (cm²)
539.1
Moving Mass (Mms) (gm)
29.9
Motor Force Factor (BL) (T•M)
13.09
Efficiency (η₀) (%)
4.35
Efficiency Bandwidth Product (EBP) (Fs/Qes)
130.15
Basket Type
Stamped Steel with black powder coat painting
Terminal Size (mm)
5.2 x 0.5
Voice Coil Diameter (mm)
44
Voice Coil Wire Material
Copper
Voice Coil Former Material
Nomex
Voice Coil Winding Style
Single Layer
Magnet Material
Ferrite
Magnet Weight (g)
1417
Cone Body Material
Felted paper
Cone Surround Material
Felted paper with damping edge treatment
Dust Cap Material
Open cloth
Spider Material
Cotton
Net Weight (kg)
5.9
Technical Notes
¹ Sensitivity is measured with 2.83 volt input, measured on-axis at 1 meter distance
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