Eminence BETA-12A

Woofer

Nominal diameter12″ / 305 mm
Resonance47 Hz
Q factor0.46
Sensitivity95.1 dB
Linear excursion± 4.4 mm
Program Power500 W
Driver
Port
Combined
Frequency response
Hz
Impedance
Ω
Impedance Phase
°
Excursion
mm
Velocity
m/s
SPL
dB
Acoustical Phase
°
Group Delay
ms
Transient response
ms
Discard
Apply
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 95.1dB
  • Frequency response 43 - 3800Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 47Hz
  • Mechanical quality factor QMS 6.00
  • Electrical quality factor QES 0.50
  • Total quality factor QTS 0.46

Large signal parameters

  • Maximum linear excursion xmax 4.4mm
  • Maximum excursion before damage xlim 11mm
  • Air volume displaced at xmax VD 237cm³
  • Power handling P 250W
  • Program power Pmax 500W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 5.0Ω
  • Inductance (1kHz) LE 0.64mH
  • VC Diameter 50.8mm
  • Winding material Copper
  • Former material Polyimide

Magnet

  • Force factor Bl 10.8N/A
  • Motor constant Bl/√RE 4.83N/√W
  • Air gap height HAG 7.9mm
  • Weight 1.077kg
  • Material Ferrite

Diaphragm

  • Effective diameter 262mm
  • Effective area SD 539cm²
  • Moving mass MMS 40g
  • Moving mass (without air load) MMD 31.3g
  • Material Paper

Suspensions

  • Stiffness KMS 3.45N/mm
  • Compliance CMS 290µm/N
  • Equivalent volume to the compliance VAS 120L
  • Mechanical resistance RMS 1.97N·s/m
  • Surround material Cloth

Dimensions

  • Nominal diameter 12
  • 305mm
  • Overall diameter 306mm
  • Baffle cutout diameter 281mm
  • Overall depth 140mm
  • Volume occupied by the driver 2.01L
  • Net weight 3.402kg
  • Frame material Pressed Steel
Eminence BETA-12A SPL & Impedance


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