Down4Sound SB10D2

2x2Ω
2x4Ω

Subwoofer

Nominal diameter10″ / 261 mm
Resonance37.7 Hz
Q factor0.43
Sensitivity84.4 dB
Linear excursion± 21 mm
Program Power1000 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 84.4dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 37.7Hz
  • Mechanical quality factor QMS 3.51
  • Electrical quality factor QES 0.49
  • Total quality factor QTS 0.43

Large signal parameters

  • Maximum linear excursion (one way) xmax 21mm
  • Air volume displaced at xmax VD 701cm³
  • Power handling P 500W
  • Program power Pmax 1000W

Voice Coil

  • Nominal impedance Z 2 x 2Ω
  • DC resistance (in series) RE 4.0Ω
  • Inductance (1kHz, in series, estimated) LE 2.6mH
  • VC Diameter 63.5mm

Magnet

  • Force factor (in series) Bl 16.2N/A
  • Motor constant Bl/√RE 8.06N/√W
  • Height 90mm

Diaphragm

  • Effective diameter 206mm
  • Effective area SD 334cm²
  • Moving mass MMS 158g
  • Moving mass (without air load) MMD 154g

Suspensions

  • Stiffness KMS 6.29N/mm
  • Compliance CMS 159µm/N
  • Equivalent volume to the compliance VAS 25.7L
  • Mechanical resistance RMS 0.74N·s/m

Dimensions

  • Nominal diameter 10
  • 261mm
  • Overall diameter 261mm
  • Baffle cutout diameter 229mm
  • Mounting depth 164mm
  • Volume occupied by the driver 2.55L
  • Net weight 9.93kg

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