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Thumbnail Filmstrip of Wavecor WF223BD01 - 8.75in. 4 Ohm Die Cast Paper Glass Fibre Cone Mid-Woofer Images
Wavecor Speaker Driver - WF223BD01 - 8.75" 4 Ohm Die Cast Paper/Glass Fibre Cone Mid-Woofer
Description
The 8.75" transducers WF223BD01 (4 ohm) and WF223BD02 (8 ohm) were designed as high performance bass/midrange units for monitors and high-end hi-fi speakers. They offer outstanding deep bass performance and dynamic and detailed midrange.
Ideal for 3-way constructions they additionally offer designers the rare opportunity of working with 8" 2-way solutions if paired with a suitable tweeter like for instance some of the Wavecor 30 mm units.
Features
- 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
- Cone made of a new paper/glass fibre mix with improved consistency and stability
- 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 and compressions at large cone excursions
- Heavy-duty black fibreglass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
- Large motor with 39 mm voice coil diameter for better control and power handling
- Built-in alu field-stabilising ring for reduced distortion at high levels
- Low-loss suspension (high Qm) for better reproduction of details and dynamics
- Black plated 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.
Loudspeaker Impedance Response Graph
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 | 8.75 | inch | ||
| Nominal impedance | 4 | Ohm | ||
| Recommended max upper frequency limit |
2 | kHz | ||
| 1, 4 | Sensitivity, 2.83V/1m (average SPL in range 200 - 1000 kHz) | 90 | dB | |
| 2, 4 | Power handling, short term, IEC 268-5, 6 kHz, no additonal filtering. | 1,200 | W | |
| 2, 4 | Power handling, long term, IEC 268-5, 6 kHz, no additonal filtering. | 300 | W | |
| 2 | Power handling, continuous, IEC 268-5, 6 kHz, no additonal filtering. | 150 | W | |
| Effective radiating area, Sd | 213 | cm2 | ||
| 3, 4, 6 | Resonance frequency (free air, no baffle), Fs | 32.6 | 31 | Hz |
| Moving mass, incl. air (free air, no baffle), Mms | 34 | g | ||
| 3, 4 | Force factor, Bxl | 7.7 | - | |
| 3, 4, 6 | Suspension compliance, Cms | 0.70 | 0.77 | mm/N |
| 3, 4, 6 | Equivalent air volume, Vas | 45 | 49.5 | ml |
| 3, 4, 6 | Mechanical resistance, Rms | 0.48 | 0.48 | Ns/m |
| 3, 4, 6 | Mechanical Q, Qms | 14.5 | 13.8 | - |
| 3, 4, 6 | Electrical Q, Qes | 0.40 | 0.38 | - |
| 3, 4, 6 | Total Q, Qts | 0.39 | 0.37 | - |
| 4 | Voice coil resistance, RDC | 3.4 |
Ohm | |
| 5 | Voice coil inductance, Le (measured at 10 kHz) | 0.13 | mH | |
| Voice coil inside diameter | 39 | mm | ||
| Voice coil winding height | 18 | mm | ||
| Air gap height | 5 | mm | ||
| Theoretical linear motor stroke, Xmax | ±6.5 | mm | ||
| Magnet weight | 0.967 | g | ||
| Total unit net weight excl. packaging | 2.5 | kg | ||
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 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.
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
Measuring conditions, harmonic distortion:
Driver mounting: In sealed enclosure, internal volume 28.5 lit.,
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 7.75 VRMS
Smoothing: 1/12 oct.