Wavecor WF120BD05 Glass Fiber 4 OHM

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The 4¾” transducer WF120BD05 (4 ohm) is designed as high performance bass and midrange units for very compact monitors and high-end hi-fi speakers.

  • Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
  • Copper cap on center pole to reduce voice coil inductance and to minimize variations in voice coil inductance as a function of voice coil position
  • Cone made of a new paper/glass fiber mix with improved consistency and stability
  • Rigid die cast alu chassis with extensive venting for lower air flow speed reducing audible distortion
  • Vented voice coil former for reduced distortion and compression
  • Vented center pole with dual flares for reduced noise level at large cone excursions
  • Heavy-duty black fiber glass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
  • Large motor with 1¼” voice coil diameter for better control and power handling
  • Built-in alu field-stabilizing ring for reduced distortion at high levels
  • Low-loss suspension (high Qm) for better reproduction of details and dynamics
  • Black motor parts for better heat transfer to the surrounding air
  • Conex spider for better durability under extreme conditions
  • Gold plated terminals to ensure long-term trouble free connection

Short data

Usage as Bass-Midrange
Power Handling 60 Watt
Impedance 4 Ohm
Frequency from 50 Hz
Max. Frequency 3.5 kHz
Sound pressure 87 dB


Overall dimensions 120.5 mm
Baffle cutout 99 mm
Depth (Total) 66 mm
Frame Material Aluminium diecast
Membrane Type Cone
Membrane Material Paper / Fibreglass
Voice coil Ø 32 mm
Voice coil height 12 mm
Voice coil material Fibreglass
Air gap height 4 mm
Magnet Ø 85 mm
Magnet-weight 370 g


Resonance fs fs: 48 Hz
Mechanical Q Qms: 7.4
Electrical Q Qes: 0.42
Total Q Qts: 0.40
Equivalent Air-Volumen Vas: 6.2 Liter
DC-Resistance Re: 3.2 Ohm
Coil Inductance Le: 0.087 mH
Mech. Compliance Cms: 1.5 mm/N
Moving Mass Mms: 7.3 g
mech. Resistance Rms: 0.30 kg/s-¹
Max. Excursion +/- Xmax: 4 mm
BL Product Bl: 4.1 N/A
Membrane Area Sd: 54 cm²
Sound pressure dB: 87 SPL

Frequency & Impedance

Technical Dimensions

PDF-Product information

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