PowerBass XL-1240DSS

2x4Ω

Subwoofer

Nominal diameter12″ / 305 mm
Resonance34.3 Hz
Q factor0.68
Sensitivity89.3 dB
Linear excursion± 7.9 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

Specifications

  • Sensitivity (1W, 1m, infinite baffle) SPL1W 89.3dB
  • Frequency response 36 - 500Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 34.3Hz
  • Mechanical quality factor QMS 6.43
  • Electrical quality factor QES 0.76
  • Total quality factor QTS 0.68

Large signal parameters

  • Maximum linear excursion (one way) xmax 7.9mm
  • Air volume displaced at xmax VD 404cm³
  • Power handling P 250W
  • Program power Pmax 500W
  • Peak power Ppeak 500W

Voice Coil

  • Nominal impedance Z 2 x 4Ω
  • DC resistance (in series) RE 6.4Ω
  • Inductance (1kHz, in series, estimated) LE 4.41mH
  • VC Diameter 50.8mm
  • Former material Kapton

Magnet

  • Force factor (in series) Bl 17.7N/A
  • Motor constant Bl/√RE 6.98N/√W
  • Weight 1.637kg

Diaphragm

  • Effective diameter 250mm
  • Effective area SD 511cm²
  • Moving mass (including air load) MMS 173g
  • Moving mass MMD 109g
  • Material Polypropylene

Suspensions

  • Stiffness KMS 6.25N/mm
  • Compliance CMS 125µm/N
  • Equivalent volume to the compliance VAS 46.1L
  • Mechanical resistance RMS 5.72N·s/m
  • Surround material TPO Thermoplastic Polyurethane

Dimensions

  • Nominal diameter 12
  • 305mm
  • Baffle cutout diameter 278mm
  • Mounting depth 148mm
  • Volume occupied by the driver (estimated) 2.4L
  • Frame material Composite Polycarbonate / Glass Fiber

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