REDCATT 81FIND

Mid Bass

Nominal diameter8″ / 209 mm
Resonance80 Hz
Q factor0.50
Sensitivity92.1 dB
Linear excursion± 6.6 mm
Program Power400 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 92.1dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 80Hz
  • Mechanical quality factor QMS 8.35
  • Electrical quality factor QES 0.53
  • Total quality factor QTS 0.50

Large signal parameters

  • Maximum linear excursion (one way) xmax 6.6mm
  • Air volume displaced at xmax VD 141cm³
  • Power handling P 200W
  • Program power Pmax 400W

Voice Coil

  • Nominal impedance Z 8Ω
  • DC resistance RE 4.7Ω
  • Inductance (1kHz) LE 0.44mH
  • VC Diameter 50.8mm
  • Winding height HVC 12.5mm
  • Winding material Copper Clad Aluminium
  • Former material kapton

Magnet

  • Force factor Bl 10.2N/A
  • Motor constant Bl/√RE 4.7N/√W
  • Air gap height HAG 8mm
  • Material Ferrite

Diaphragm

  • Effective diameter 165mm
  • Effective area SD 214cm²
  • Moving mass MMS 22.6g
  • Moving mass (without air load) MMD 20.3g
  • Material Paper

Suspensions

  • Stiffness KMS 5.88N/mm
  • Compliance CMS 170µm/N
  • Equivalent volume to the compliance VAS 11.3L
  • Mechanical resistance RMS 1.36N·s/m
  • Surround material Fabric
  • Spider material Nomex

Dimensions

  • Nominal diameter 8
  • 209mm
  • Overall diameter 209mm
  • Baffle cutout diameter 180mm
  • Mounting depth 92mm
  • Volume occupied by the driver (estimated) 1.2L
  • Net weight 2.8kg
REDCATT 81FIND SPL & Impedance
REDCATT 81FIND Dimensions

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