Wavecor WF120BD09

Wavecor WF120BD09 Paper/Glass Fiber 4 Ohm

The 4¾” transducers WF120BD05/WF120BD09 (4 ohm) and WF120BD06/WF120BD10 (8 ohm) were designed as high performance bass and midrange units for very compact monitors and high-end hi-fi speakers.
The only difference between WF120BD05 and WF120BD09 is the shape of the mounting flange of the frames. WF120BD06 and WF120BD10 differ in the same way.

Features

• 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

Specifications

• power handling (continuous/programme) = 60 W
• frequency range = 60-3000 Hz
• resonance frequency fs = 48 Hz
• impedance R = 4 Ohm
• sound pressure level SPL = 87 dB (2,83V; 1m)
• DC resistance Re = 3,2 Ohm
• force factor BL = 4,1 N/A
• voice coil inductance L = 0,087 mH
• effective piston radiating area Sd = 54 cm²
• effective mechanical mass incl. air load mms = 7,3 g
• equivalent volume of compliance Vas = 6,2 l
• total Q factor Qts = 0,4 (Qms=7,4, Qes=0,42)
• voice coil diameter = 32 mm
• maximum peak linear excursion vibration x_lin = +/- 4 mm
• mounting diameter d = 100 mm
• overall diameter d = 120 mm
• mounting depth (not countersunk) t = 72 mm