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Thumbnail Filmstrip of Wavecor Speaker Driver WF182BD03 - 4 Ohm 7in. Die Cast Paper Cone Mid-Woofer Images
Wavecor Speaker Driver - WF182BD03 - 4 Ohm 7" Die Cast Paper Cone Mid-Woofer
Description
The 7" transducers WF182BD03 and WF182BD07 (both 4 ohm) and WF182BD04 and WF182BD08 (both 8 ohm) were designed as high performance bass and midrange units for monitors and high-end hi-fi speakers. They offer outstanding deep bass performance and dynamic and detailed midrange.
Features
- Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced 2nd 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 1½” 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
Frequency SPL and Impedance Response Graphs
Loudspeaker Frequency Response Graph
Measuring conditions, SPL
Driver mounting: Flush in infinite baffle
Microphone distance: 1.0 m
Input level: 2.83 VRMS
Smoothing: 1/6 oct.
Measuring conditions, impedance
Driver mounting: Free air, no baffle
Input signal: Stepped sine wave, semi-current-drive, nominal current 2 mA
Smoothing: None
Technical Specifications
| Notes | Parameter | Value | Unit | |
| Before Burn-in | After Burn-in | |||
| Nominal size | 7 | inch | ||
| Nominal impedance | 4 | Ohm | ||
| Recommended max upper frequency limit |
2.5 | kHz | ||
| 1 | Sensitivity, 2.83V/1m (average SPL in range 200-1000 kHz) | 91 | dB | |
| 2 | Power handling, short term, IEC 268-5, 6 kHz, no additional filtering | W | ||
| 2 | Power handling, long term, IEC 268-5, 6 kHz, no additional filtering | W | ||
| 2 | Power handling, continuous, IEC 268-5, 6 kHz, no additional filtering | 80 | W | |
| Effective radiating area, Sd | 131 | cm2 | ||
| 3, 6 | Resonance frequency (free air, no baffle), Fs | 39 | 33.8 | Hz |
| Moving mass, incl. air (free air, no baffle), Mms | 16.7 | g | ||
| 3 | Force factor, Bxl | 6.75 | - | |
| 3, 6 | Suspension compliance, Cms | 1.0 | 1.33 | mm/N |
| 3, 6 | Equivalent air volume, Vas | 24.4 | 32.4 | lit |
| 3, 6 | Mechanical resistance, Rms | 0.37 | 0.43 | Ns/m | 3, 6 | Mechanical Q, Qms | 11 | 8.2 | - |
| 3, 6 | Electrical Q, Qes | 0.30 | 0.26 | - |
| 3, 6 | Total Q, Qts | 0.29 | 0.25 | - |
| 4 | Voice coil resistance, RDC | 3.3 | Ohm | 5 | Voice coil inductance, Le (measured at 10 kHz) | 0.088 | mH |
| Voice coil inside diameter | 39 | mm | Voice coil winding height | 16 | mm |
| Air gap height | 5 | mm | Magnet weight | 885 | g |
| Total unit net weight excl. packaging | 2.3 | kg | 3, 5 | Krm | 33 | mOhm |
| 3, 5 | Erm | 0.42 | - | 3, 5 | Kxm | 157 | mH |
| 3, 5 | Exm | 0.19 | - | |
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 20 deg. 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 (www.linearx.com), involving parameters Krm, Erm, Kxm, and Exm. This more accurate transducer model is described in a technical paper (PDF) here.
Note 6 After burn-in specifications are measured 12 hours after exiting the transducer by a 20 Hz sine wave for 2 hours at level 10/14.1 VRMS (4/8 ohm version). The unit is not burned in before shipping
Driver Nominal Dimensions
Loudspeaker Driver Dimensions and Measurements - all dimensions in mm (approx.)
Terminal Nominal Dimensions
Loudspeaker Driver Terminal Dimensions and Measurements - all dimensions in mm (approx.)
Thickness, both terminals: 0.5 mm
Terminal plating: Gold