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Wavecor WF120BD03 11 cm papercone midwoofer 4ohm View larger

Wavecor WF120BD03 11 cm papercone midwoofer 4ohm

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Wavecor WF120BD03 11 cm papercone midwoofer 4ohm

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The 4¾” transducers WF120BD03 (4 ohm) and WF120BD04 (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 WF120BD03 and WF120BD07 is the shape of the mounting flange of the frames. WF120BD04 and WF120BD08 differ in the same way.

  • 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
  • Black coated semi-air-dried paper cone
  • Rigid die cast alu chassis with extensive venting for lower air flow speed reducing audible distortion
  • Large motor for better control and power handling
  • Vented voice coil former 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
  • 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
  • Notes

      Parameter

    WF120BD03 /
    WF120BD07

    WF120BD04 /
    WF120BD08

    Unit

    Before burn-in

    After burn-in

    Before burn-in

    After burn-in

     

    Nominal size

    [inch.]

     

    Nominal impedance

    4

    8

    [ohm]

     

    Recommended max. upper frequency limit

    4

    4

    [kHz]

    1

    Sensitivity, 2.83V/1m (average SPL in range 300 - 1,000 Hz)

    88.5

    86

    [dB]

    2

    Power handling, short term, IEC 268-5, no additional filtering

     

     

    [W]

    2

    Power handling, long term, IEC 268-5, no additional filtering

     

     

    [W]

    2

    Power handling, continuous, IEC 268-5, no additional filtering

    50

    50

    [W]

     

    Effective radiating area, Sd

    54

    54

    [sq.cm]

    3, 6

    Resonance frequency (free air, no baffle), Fs

    70

    61.5

    71.5

    63

    [Hz]

     

    Moving mass, incl. air (free air, no baffle), Mms

    6.55

    6.25

    [g]

    3

    Force factor, Bxl

    4.5

    5.5

    [N/A]

    3, 6

    Suspension compliance, Cms

    0.79

    1.03

    0.79

    1.03

    [mm/N]

    3, 6

    Equivalent air volume, Vas

    3.25

    4.25

    3.25

    4.25

    [lit.]

    3, 6

    Mechanical resistance, Rms

    0.49

    0.42

    0.49

    0.42

    [Ns/m]

    3, 6

    Mechanical Q, Qms

    5.9

    6.0

    5.7

    5.9

    [-]

    3, 6

    Electrical Q, Qes

    0.46

    0.40

    0.56

    0.49

    [-]

    3, 6

    Total Q, Qts

    0.42

    0.37

    0.51

    0.45

    [-]

    4

    Voice coil resistance, RDC

    3.2

    6.0

    [ohm]

    5

    Voice coil inductance, Le (measured at 10 kHz)

    0.086

    0.14

    [mH]

     

    Voice coil inside diameter

    26

    26

    [mm]

     

    Voice coil winding height

    12

    12

    [mm]

     

    Air gap height

    4

    4

    [mm]

     

    Magnet weight

    430

    430

    [g]

     

    Total unit net weight excl. packaging

    1.04

    1.04

    [kg]

    3, 5

    Krm

    27

    33

    [mohm]

    3, 5

    Erm

    0.43

    0.44

    [-]

    3, 5

    Kxm

    198

    430

    [mH]

    3, 5

    Exm

    0.17

    0.14

    [-]

  • WF120BD05-SPL-&-IMP-responseWF120BD03_04-outline-drawingTerminals-dimensions

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