Earthquake MAGMA-15X

2x4Ω

Subwoofer

Nominal diameter15″ / 381 mm
Resonance20.2 Hz
Q factor0.30
Sensitivity88.9 dB
Linear excursion± 19.1 mm
Program power2000 W
Earthquake MAGMA-15X SubwooferEarthquake MAGMA-15X SubwooferEarthquake MAGMA-15X Subwoofer
Excursion
Velocity
SPL
Phase
Group delay
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

Specifications

  • Sensitivity (1W, 1m, infinite baffle) SPL1W 88.9dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 20.2Hz
  • Mechanical quality factor QMS 4.79
  • Electrical quality factor QES 0.32
  • Total quality factor QTS 0.30

Large signal parameters

  • Maximum linear excursion (one way) xmax 19.1mm
  • Maximum excursion before damage xlim 31.8mm
  • Air volume displaced at xmax VD 1696cm³
  • Power handling P 1000W
  • Program power Pmax 2000W

Voice Coil

  • Nominal impedance Z 2 x 4Ω
  • DC resistance (in series) RE 8.0Ω
  • Inductance (1kHz, in series, estimated) LE 8.45mH

Magnet

  • Force factor (in series) Bl 32.4N/A
  • Motor constant Bl/√RE 11.5N/√W
  • Diameter 227mm

Diaphragm

  • Effective diameter 337mm
  • Effective area SD 890cm²
  • Moving mass (including air load) MMS 332g
  • Moving mass MMD 314g
  • Material non-pressed fiber cone

Suspensions

  • Stiffness KMS 5.35N/mm
  • Compliance CMS 187µm/N
  • Equivalent volume to the compliance VAS 210L
  • Mechanical resistance RMS 8.8N·s/m
  • Surround material Poly-ether

Dimensions

  • Nominal diameter 15″
  • 381mm
  • Baffle cutout diameter 357mm
  • Overall depth 203mm
  • Flange thickness 0mm
  • Mounting depth 203mm
  • Volume occupied by the driver 5.66L
Impedance
Step response
Tone Burst
PDF fileDatasheet

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