Down4Sound DBz18D4

2x2Ω
2x4Ω

Subwoofer

Nominal diameter18″ / 469 mm
Resonance30.8 Hz
Q factor0.51
Sensitivity90.7 dB
Linear excursion± 30 mm
Program Power2600 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 90.7dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 30.8Hz
  • Mechanical quality factor QMS 2.75
  • Electrical quality factor QES 0.62
  • Total quality factor QTS 0.51

Large signal parameters

  • Maximum linear excursion (one way) xmax 30mm
  • Air volume displaced at xmax VD 3627cm³
  • Power handling P 1300W
  • Program power Pmax 2600W

Voice Coil

  • Nominal impedance Z 2 x 4Ω
  • DC resistance (in series) RE 6.1Ω
  • Inductance (1kHz, in series, estimated) LE 8.2mH
  • VC Diameter 69.9mm

Magnet

  • Force factor (in series) Bl 31.2N/A
  • Motor constant Bl/√RE 12.7N/√W
  • Diameter 422mm

Diaphragm

  • Effective diameter 392mm
  • Effective area SD 1209cm²
  • Moving mass MMS 482g
  • Moving mass (without air load) MMD 452g

Suspensions

  • Stiffness KMS 20.5N/mm
  • Compliance CMS 48.8µm/N
  • Equivalent volume to the compliance VAS 101L
  • Mechanical resistance RMS 0.78N·s/m

Dimensions

  • Nominal diameter 18
  • 469mm
  • Overall diameter 469mm
  • Baffle cutout diameter 427mm
  • Mounting depth 253mm
  • Volume occupied by the driver 5.95L
  • Net weight 15.51kg

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