Eminence ALPHA-12A

Name: ALPHA-12A
Brand: Eminence

Mid Bass

12″ / 305 mm

Nominal diameter

49 Hz

Resonance

0.77

Q factor

93 dB

Sensitivity

± 2.4 mm

Linear excursion

300 W

Program Power

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Sensitivity (1W, 1m, infinite baffle)
SPL_1W: 93.4; dB
Frequency response: 51 - 4300; Hz
Resonance frequency (free air)
f_S: 49.0; Hz
Mechanical quality factor
Q_MS: 6.53
Electrical quality factor
Q_ES: 0.88
Total quality factor
Q_TS: 0.77
Maximum linear excursion
x_max: 2.4; mm
Maximum excursion before damage
x_lim: 6.6; mm
Air volume displaced at x_max
V_D: 125; cm³
Power handling
P: 150; W
Program power
P_max: 300; W
Nominal impedance
Z: 8; Ω
DC resistance
R_E: 6.3; Ω
Inductance (1kHz)
L_E: 0.79; mH
VC Diameter: 38; mm
Winding material: Copper
Former material: Polyimide
Force factor
Bl: 8.5; N/A
Motor constant
Bl/√R_E: 3.39; N/√W
Air gap height
H_AG: 6.4; mm
Weight: 0.567; kg
Material: Ferrite
Effective diameter: 257; mm
Effective area
S_D: 520; cm²
Moving mass
M_MS: 33; g
Moving mass (without air load)
M_MD: 24.5; g
Material: Paper
Stiffness
K_MS: 3.13; N/mm
Compliance
C_MS: 320; µm/N
Equivalent volume to the compliance
V_AS: 122; L
Mechanical resistance
R_MS: 1.56; N·s/m
Surround material: Cloth
Nominal diameter: 12; ″
: 305; mm
Overall diameter: 311; mm
Baffle cutout diameter: 281; mm
Overall depth: 120; mm
Volume occupied by the driver: 1.78; L
Net weight: 2.4; kg
Frame material: Pressed steel

Datasheet

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Eminence ALPHA-12A

Mid Bass

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Specifications

Thiele & Small parameters

Large signal parameters

Voice Coil

Magnet

Diaphragm

Suspensions

Dimensions

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