REDCATT 40NFR

16Ω

Full-range

Nominal diameter4″ / 104 mm
Resonance115 Hz
Q factor1.10
Sensitivity85.9 dB
Linear excursion± 2.9 mm
Program Power50 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 85.9dB

Thiele & Small parameters

  • Resonance frequency (free air) fS 115Hz
  • Mechanical quality factor QMS 6.20
  • Electrical quality factor QES 1.30
  • Total quality factor QTS 1.10

Large signal parameters

  • Maximum linear excursion (one way) xmax 2.9mm
  • Air volume displaced at xmax VD 15cm³
  • Power handling P 25W
  • Program power Pmax 50W

Voice Coil

  • Nominal impedance Z 16Ω
  • DC resistance RE 12.3Ω
  • Inductance (1kHz) LE 0.2mH
  • VC Diameter 19mm
  • Winding height HVC 4.9mm
  • Winding material Copper Clad Aluminium
  • Former material kapton

Magnet

  • Force factor Bl 5.3N/A
  • Motor constant Bl/√RE 1.51N/√W
  • Air gap height HAG 4mm
  • Material Neodymium

Diaphragm

  • Effective diameter 80mm
  • Effective area SD 50.2cm²
  • Moving mass MMS 4.4g
  • Moving mass (without air load) MMD 4.1g
  • Material GF Honeycomb

Suspensions

  • Stiffness KMS 2.15N/mm
  • Compliance CMS 466µm/N
  • Equivalent volume to the compliance VAS 1.5L
  • Mechanical resistance RMS 0.51N·s/m
  • Surround material Rubber
  • Spider material Conex

Dimensions

  • Nominal diameter 4
  • 104mm
  • Overall diameter 104mm
  • Baffle cutout diameter 91mm
  • Mounting depth 51mm
  • Volume occupied by the driver (estimated) 0.15L
  • Net weight 0.2kg
REDCATT 40NFR SPL & Impedance

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