The 6” transducers WF152BD03 (4 ohm) and WF152BD04 (8 ohm) were designed as high performance bass and midrange units for 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
- Black coated semi-air-dried paper cone
- 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
Notes
Parameter
WF152BD03
WF152BD04
Unit
Before burn-in
After burn-in
Before burn-in
After burn-in
Nominal size
6
6
[inch.]
Nominal impedance
4
8
[ohm]
Recommended max. upper frequency limit
3.5
3.5
[kHz]
1
Sensitivity, 2.83V/1m (average SPL in range 300 - 1,000 Hz)
91
88.5
[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
70
70
[W]
Effective radiating area, Sd
93
93
[sq.cm]
3, 6
Resonance frequency (free air, no baffle), Fs
55.5
50
56.5
51
[Hz]
Moving mass, incl. air (free air, no baffle), Mms
11.0
10.6
[g]
3
Force factor, Bxl
5.8
7.3
[N/A]
3, 6
Suspension compliance, Cms
0.75
0.93
0.75
0.93
[mm/N]
3, 6
Equivalent air volume, Vas
9.2
11.4
9.2
11.4
[lit.]
3, 6
Mechanical resistance, Rms
0.43
0.46
0.43
0.46
[Ns/m]
3, 6
Mechanical Q, Qms
8.9
7.5
8.7
7.3
[-]
3, 6
Electrical Q, Qes
0.36
0.33
0.44
0.40
[-]
3, 6
Total Q, Qts
0.35
0.31
0.42
0.38
[-]
4
Voice coil resistance, RDC
3.2
6.3
[ohm]
5
Voice coil inductance, Le (measured at 10 kHz)
0.096
0.15
[mH]
Voice coil inside diameter
32
32
[mm]
Voice coil winding height
14
14
[mm]
Air gap height
5
5
[mm]
Magnet weight
630
630
[g]
Total unit net weight excl. packaging
1.46
1.46
[kg]
3, 5
Krm
46
50
[mohm]
3, 5
Erm
0.39
0.42
[-]
3, 5
Kxm
260
580
[mH]
3, 5
Exm
0.16
0.12
[-]
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