PowerBass XL-1240

Subwoofer

Nominal diameter12″ / 305 mm
Resonance33 Hz
Q factor0.57
Sensitivity87.4 dB
Linear excursion± 8.5 mm
Program Power800 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 87.4dB
  • Frequency response 33 - 450Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 33Hz
  • Mechanical quality factor QMS 3.73
  • Electrical quality factor QES 0.64
  • Total quality factor QTS 0.57

Large signal parameters

  • Maximum linear excursion xmax 8.5mm
  • Air volume displaced at xmax VD 469cm³
  • Power handling P 400W
  • Program power Pmax 800W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 3.5Ω
  • Inductance (1kHz, estimated) LE 2.39mH
  • VC Diameter 51mm

Magnet

  • Force factor Bl 14.8N/A
  • Motor constant Bl/√RE 7.92N/√W
  • Weight 5.27kg

Diaphragm

  • Effective diameter 265mm
  • Effective area SD 552cm²
  • Moving mass MMS 172g
  • Moving mass (without air load) MMD 163g
  • Material Non Pressed Paper

Suspensions

  • Stiffness KMS 7.83N/mm
  • Compliance CMS 128µm/N
  • Equivalent volume to the compliance VAS 55.2L
  • Mechanical resistance RMS 9.56N·s/m

Dimensions

  • Nominal diameter 12
  • 305mm
  • Baffle cutout diameter 281mm
  • Mounting depth 145mm
  • Volume occupied by the driver (estimated) 2.4L


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2 x 4 Ω
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fS33 Hz
SD552 cm²
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fS32 Hz
SD511 cm²
31 - 500 Hz
QTS0.49
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