Audio System R 08 FLAT EVO 3-D4

2x4Ω

Shallow Subwoofer

Nominal diameter8″ / 200 mm
Resonance59 Hz
Q factor0.46
Sensitivity85.3 dB
Linear excursion± 6.3 mm
Program Power300 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 85.3dB
  • Frequency response 35 - 120Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 59Hz
  • Mechanical quality factor QMS 5.58
  • Electrical quality factor QES 0.51
  • Total quality factor QTS 0.46

Large signal parameters

  • Maximum linear excursion (one way) xmax 6.3mm
  • Air volume displaced at xmax VD 132cm³
  • Power handling P 200W
  • Program power Pmax 300W

Voice Coil

  • Nominal impedance Z 2 x 4Ω
  • DC resistance (in series) RE 7.2Ω
  • Inductance (1kHz, in series, estimated) LE 2.01mH
  • VC Diameter 38.6mm
  • Former material Aluminum

Magnet

  • Force factor (in series) Bl 11.1N/A
  • Motor constant Bl/√RE 4.14N/√W
  • Diameter 120mm

Diaphragm

  • Effective diameter 164mm
  • Effective area SD 211cm²
  • Moving mass MMS 45g
  • Moving mass (without air load) MMD 42.7g
  • Material KPC Paper

Suspensions

  • Stiffness KMS 3.24N/mm
  • Compliance CMS 309µm/N
  • Equivalent volume to the compliance VAS 7.7L
  • Mechanical resistance RMS 2.99N·s/m
  • Surround material Elasthan
  • Spider material PPTA Connex

Dimensions

  • Nominal diameter 8
  • 200mm
  • Overall diameter 214mm
  • Baffle cutout diameter 178mm
  • Overall depth 82mm
  • Flange thickness 15mm
  • Mounting depth 67mm
  • Volume occupied by the driver (estimated) 0.87L
  • Net weight 2.7kg
  • Frame material Steel

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