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Thumbnail Filmstrip of Wavecor WF120BD16 - 8 Ohm Die Cast Paper Glass Mid-Woofer Images
Wavecor Speaker Driver - WF120BD16 - 8 Ohm Die Cast Paper/Glass Mid-Woofer
Description
The 4¾" transducer WF120BD16 (8 Ohm) was designed as a high-performance bass and midrange unit for very compact monitors and high-end hi-fi speakers. It features a black-coated cone and dust cap, replacing the original WF120BD06 while maintaining identical technical specifications.
Features
- Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even-order harmonic distortion
- Copper cap on centre pole to reduce voice coil inductance and to minimise variations in voice coil inductance as a function of voice coil position
- Cone made of a new paper/glass fibre mix with improved consistency and stability
- Rigid die-cast aluminium chassis with extensive venting for lower airflow speed, reducing audible distortion
- Vented voice coil former for reduced distortion and compression
- Vented centre pole with dual flares for reduced noise level at large cone excursions
- Heavy-duty black glass fibre 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 aluminium field-stabilising 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
Technical Specifications
| Notes | Parameter | Before Burn-in | After Burn-in | Unit |
| Nominal size | 4¾ | inch | ||
| Nominal impedance | 8 | Ohm | ||
| Recommended max. upper frequency limit | 3.5 | kHz | ||
| 1, 4 | Sensitivity, 2.83V/1m (average SPL in range 300 - 1000 Hz) | 84 | dB | |
| 2 | Power handling, short term, IEC 268-5, 6 kHz, no additional filtering | 150 | W | |
| 2 | Power handling, long term, IEC 268-5, 6 kHz, no additional filtering | 90 | W | |
| 2 | Power handling, continuous, IEC 268-5, 6 kHz, no additional filtering | 60 | W | |
| Effective radiating area, Sd | 54 | cm2 | ||
| 3, 4, 6 | Resonance frequency (free air, no baffle), Fs | 54 | 50 | Hz |
| Moving mass, incl. air (free air, no baffle), Mms | 6.7 | g | ||
| 3 | Force factor, Bxl | 5.2 | N/A | |
| 3, 4, 6 | Suspension compliance, Cms | 1.29 | 1.50 | mm/N |
| 3, 4, 6 | Equivalent air volume, Vas | 5.3 | 6.2 | lit. |
| 3, 4, 6 | Mechanical resistance, Rms | 0.30 | 0.30 | N·s/m |
| 3, 4, 6 | Mechanical Q, Qms | 7.6 | 7.0 | - |
| 3, 4, 6 | Electrical Q, Qes | 0.54 | 0.50 | - |
| 3, 4, 6 | Total Q, Qts | 0.50 | 0.47 | - |
| 4 | Voice coil resistance, RDC | 6.4 | Ohm | |
| 5 | Voice coil inductance, Le (measured at 10 kHz) | 0.16 | mH | |
| Voice coil inside diameter | 32 | mm | ||
| Voice coil winding height | 12 | mm | ||
| Air gap height | 4 | mm | ||
| Theoretical linear motor stroke, Xmax | ±4 | mm | ||
| Magnet weight | 370 | g | ||
| Total unit net weight excl. packaging | 1.05 | kg | ||
| 3, 4, 5 | Krm | 109 | mOhm | |
| 3, 4, 5 | Erm | 0.35 | - | |
| 3, 4, 5 | Kxm | 145 | mH | |
| 3, 4, 5 | Exm | 0.27 | - | |
Note 1 Measured in infinite baffle.
Note 2 Tested in free air (no cabinet).
Note 3 Measured using a semi-constant
current source, nominal level 2 mA.
Note 4 Measured at 25 °C
Note 5 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, involving parameters Krm, Erm, Kxm, and Exm.
Note 6 After burn-in specifications are measured 12 hours
after exciting 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.