B&C Speaker 8NDL51

Woofer

Nominal diameter8″ / 200 mm
Resonance75 Hz
Q factor0.57
Sensitivity90.6 dB
Linear excursion± 7 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
  • Sensitivity (1W, 1m, infinite baffle) SPL1W 90.6dB
  • Frequency response 75 - 3000Hz

Thiele & Small parameters

  • Resonance frequency (free air) fS 75Hz
  • Mechanical quality factor QMS 5.22
  • Electrical quality factor QES 0.64
  • Total quality factor QTS 0.57

Large signal parameters

  • Maximum linear excursion xmax 7mm
  • Air volume displaced at xmax VD 154cm³
  • Power handling P 200W
  • Program power Pmax 400W

Voice Coil

  • Nominal impedance Z 4Ω
  • DC resistance RE 2.6Ω
  • Inductance (1kHz) LE 0.15mH
  • VC Diameter 51mm
  • Winding height HVC 16mm
  • Winding material Copper
  • Former material Glass Fibre

Magnet

  • Flux density B 1.05T
  • Force factor Bl 7.3N/A
  • Motor constant Bl/√RE 4.53N/√W
  • Air gap height HAG 8mm
  • Material Neodymium Inside Slug

Diaphragm

  • Effective diameter 167mm
  • Effective area SD 220cm²
  • Moving mass MMS 27g
  • Moving mass (without air load) MMD 24.5g
  • Material Waterproof Both Sides

Suspensions

  • Stiffness KMS 6.17N/mm
  • Compliance CMS 162µm/N
  • Equivalent volume to the compliance VAS 10.1L
  • Mechanical resistance RMS 2.44N·s/m

Dimensions

  • Nominal diameter 8
  • 200mm
  • Overall diameter 225mm
  • Baffle cutout diameter 187mm
  • Overall depth 90mm
  • Flange thickness 11mm
  • Mounting depth 79mm
  • Volume occupied by the driver 1.1L
  • Net weight 1.85kg
B&C Speaker 8NDL51 Impedance
B&C Speaker 8NDL51 SPL
B&C Speaker 8NDL51 Dimensions

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