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Thumbnail Filmstrip of Wavecor Subwoofer SW223BD02 4 Ohm 8 Inch Images
Wavecor Speaker Driver - SW223BD02 - 4 Ohm 8¾" Alu-Cone Subwoofer
Description
The 8¾" transducer SW223BD02 - 4 Ohm was designed specifically for high performance compact subwoofer applications where sound quality and low distortion are the priorities.
Features
- Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
- Extremely large linear stroke, Xmax = ±10.7 mm, ensuring low distortion at high output levels
- Very rigid black aluminium cone to ensure piston motion at high levels and for better heat transfer at high continuous power levels
- Rigid die cast alu chassis with extensive venting for lower air flow speed reducing audible distortion
- Heavy-duty black fibre glass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
- Large motor with 2" 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 plated cone and 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 for 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 for 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 |
| Nominal size | 8¾ | inch | |
| Nominal impedance | 4 | Ohm | |
| Recommended max. upper frequency limit |
1000 | kHz | |
| 1, 3 | Sensitivity, 2.83V/1m (calculated from T/S parameters) | 83 | 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. | 200 | W |
| Effective radiating area, Sd | 206 | cm2 | |
| 3, 6 | Resonance frequency (free air, no baffle), Fs | 24 | Hz |
| Moving mass, incl. air (free air, no baffle), Mms | 97 | g | |
| 3 | Force factor, Bxl | 11.0 | - |
| 3, 6 | Suspension compliance, Cms | 0.47 | mm/N |
| 3, 6 | Equivalent air volume, Vas | 28 | lit. |
| 3, 6 | Mechanical resistance, Rms | 1.35 | Ns/M |
| 3, 6 | Mechanical Q, Qms | 10.7 | - |
| 3, 6 | Electrical Q, Qes | 0.42 | - |
| 3, 6 | Total Q, Qts | 0.40 | - |
| 4 | Voice coil resistance, RDC | 3.5 | Ohm |
| 5 | Voice coil inductance, Le (measured at 1 kHz) | 0.80 | mH |
| Voice coil inside diameter | 51 | mm | |
| Voice coil winding height | 29.4 | mm | |
| Air gap height | 6 | mm | |
| Theoretical linear motor stroke, Xmax | ±11.7 | mm | |
| Magnet weight | g | ||
| Total unit net weight excl. packaging | 4.4 | kg | |
| 3, 5 | Krm | 84 | mOhm |
| 3, 5 | Erm | 0.37 | - |
| 3, 5 | Kxm | 20 | mH |
| 3, 5 | Exm | 0.57 | - |
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 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.
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