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WF118WA07 (4 ohm) and WF118WA08 (8 ohm) are 4½" mid/woofers designed for demanding bass and midrange applications. They work equally well for hi-fi, high quality home theater systems, multimedia setups, or high quality personal audio systems.
With the new SLIM-line frame design and a new suspension optimized for high-level bass output, these units are perfectly suited for compact high performance speakers.
- FEA optimized suspension for perfect symmetry, reducing even order harmonic distortion
- Balanced Drive motor with perfect force factor symmetry for reduced distortion
- Alu field-stabilizing ring inside magnet assembly for reduced distortion at high levels
- Vented voice coil former for reduced distortion and compression
- Vented chassis for lower air flow speed reducing audible distortion
- Heavy-duty black fiber glass voice coil bobbin to increase power handling and reduce mechanical losses resulting in better dynamic performance and low-level details
- Large motor system with 1¼” voice coil diameter and 80 mm magnet for better control and efficiency
- Progressive suspension with optimized compromise between linearity and soft clipping
- Suspension with CONEX damper (spider) for long durability under extreme operating conditions
- Gold plated terminals to prevent oxidation for long-term reliable connection
- Delivered with foam gasket attached to the frame for hassle-free mounting and secure enclosure sealing
Notes
Parameter
WF118WA07
WF118WA08
Unit
Before burn-in
After burn-in
Before burn-in
After burn-in
Nominal size
4½
4½
[inch.]
Nominal impedance
4
8
[ohm]
Recommended max. upper frequency limit
3
3
[kHz]
1, 4
Sensitivity, 2.83V/1m (average SPL in range 200 - 2,000 Hz)
87
84
[dB]
2, 4
Power handling, short term, IEC 268-5, no additional filtering
[W]
2, 4
Power handling, long term, IEC 268-5, no additional filtering
[W]
2
Power handling, continuous, IEC 268-5, no additional filtering
[W]
Effective radiating area, Sd
54
54
[sq.cm]
3, 4, 6
Resonance frequency (free air, no baffle), Fs
56
58
[Hz]
Moving mass, incl. air (free air, no baffle), Mms
6.9
6.5
[g]
3, 4
Force factor, Bxl
4.5
5.8
[N/A]
3, 4, 6
Suspension compliance, Cms
1.18
1.18
[mm/N]
3, 4, 6
Equivalent air volume, Vas
4.9
4.9
[lit.]
3, 4, 6
Mechanical resistance, Rms
0.31
0.31
[Ns/m]
3, 4, 6
Mechanical Q, Qms
7.8
7.6
[-]
3, 4, 6
Electrical Q, Qes
0.38
0.45
[-]
3, 4, 6
Total Q, Qts
0.36
0.42
[-]
4
Voice coil resistance, RDC
3.2
6.4
[ohm]
5
Voice coil inductance, Le (measured at 10 kHz)
0.22
0.36
[mH]
Voice coil inside diameter
26
26
[mm]
Voice coil winding height
12
12
[mm]
Air gap height
4
4
[mm]
Theoretical linear motor stroke, Xmax
±4
±4
[mm]
Magnet weight
[g]
Total unit net weight excl. packaging
[kg]
3, 4, 5
Krm
0.81
1.34
[mohm]
3, 4, 5
Erm
0.79
0.79
[-]
3, 4, 5
Kxm
3.6
5.5
[mH]
3, 4, 5
Exm
0.73
0.74
[-]
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