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NOMINAL SPECIFICATIONS
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Notes
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Parameter
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WF120BD03 /
WF120BD07
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WF120BD04 /
WF120BD08
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Unit
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Before burn-in
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After burn-in
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Before burn-in
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After burn-in
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Nominal size
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4.75
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4.75
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[inch.]
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Nominal impedance
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4
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8
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[ohm]
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Recommended max. upper frequency limit
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4
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4
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[kHz]
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1
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Sensitivity, 2.83V/1m (average SPL in range 300 - 1,000 Hz)
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88.5
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86
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[dB]
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2
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Power handling, short term, IEC 268-5, no additional filtering
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[W]
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2
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Power handling, long term, IEC 268-5, no additional filtering
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[W]
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2
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Power handling, continuous, IEC 268-5, no additional filtering
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50
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50
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[W]
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Effective radiating area, Sd
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54
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54
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[sq.cm]
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3, 6
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Resonance frequency (free air, no baffle), Fs
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70
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61.5
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71.5
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63
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[Hz]
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Moving mass, incl. air (free air, no baffle), Mms
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6.55
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6.25
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[g]
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3
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Force factor, Bxl
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4.5
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5.5
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[N/A]
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3, 6
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Suspension compliance, Cms
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0.79
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1.03
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0.79
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1.03
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[mm/N]
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3, 6
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Equivalent air volume, Vas
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3.25
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4.25
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3.25
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4.25
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[lit.]
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3, 6
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Mechanical resistance, Rms
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0.49
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0.42
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0.49
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0.42
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[Ns/m]
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3, 6
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Mechanical Q, Qms
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5.9
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6.0
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5.7
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5.9
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[-]
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3, 6
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Electrical Q, Qes
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0.46
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0.40
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0.56
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0.49
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[-]
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3, 6
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Total Q, Qts
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0.42
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0.37
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0.51
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0.45
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[-]
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4
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Voice coil resistance, RDC
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3.2
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6.0
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[ohm]
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5
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Voice coil inductance, Le (measured at 10 kHz)
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0.086
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0.14
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[mH]
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Voice coil inside diameter
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26
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26
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[mm]
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Voice coil winding height
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12
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12
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[mm]
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Air gap height
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4
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4
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[mm]
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Magnet weight
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430
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430
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[g]
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Total unit net weight excl. packaging
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1.04
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1.04
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[kg]
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3, 5
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Krm
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27
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33
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[mohm]
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3, 5
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Erm
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0.43
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0.44
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[-]
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3, 5
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Kxm
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198
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430
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[mH]
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3, 5
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Exm
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0.17
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0.14
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[-]
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Note 1
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Measured in infinite baffle.
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Note 2
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Tested in free air (no cabinet).
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Note 3
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Measured using a semi-constant current source, nominal level 2 mA.
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Note 4
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Measured at 25 deg. C
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Note 5
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It is generally a rough simplification to assume that loudspeaker transducer voice coils exhibit the characteristics of an inductor. Instead it is a far more accurate approach to use the more advanced model often referred to as the “Wright empirical model”, also used in LEAP-4 as the TSL model (www.linearx.com), involving parameters Krm, Erm, Kxm, and Exm. This more accurate transducer model is described in a technical paper (PDF) here.
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Note 6
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After burn-in specifications are measured 12 hours after exiting the transducer by a 20 Hz sine wave for 2 hours at level 7.75/11 VRMS (4/8 ohm version). The unit is not burned in before shipping.
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OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)
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Part no. WF120BD03-01
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4 ohm version, round, individual packaging (one piece per box)
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Part no. WF120BD03-02
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4 ohm version, round, bulk packaging
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Part no. WF120BD04-01
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8 ohm version, round, individual packaging (one piece per box)
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Part no. WF120BD04-02
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8 ohm version, round, bulk packaging
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Part no. WF120BD07-01
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4 ohm version, truncated, individual packaging (one piece per box)
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Part no. WF120BD07-02
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4 ohm version, truncated, bulk packaging
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Part no. WF120BD08-01
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8 ohm version, truncated, individual packaging (one piece per box)
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Part no. WF120BD08-02
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8 ohm version, truncated, bulk packaging
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Latest update: September 9, 2018
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Specifications are subject to change without any further notice.
Copyright © 2006-2022 by Wavecor Ltd., China. All rights reserved.
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MORE INFO
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