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Thumbnail Filmstrip of Wavecor Tweeter 22mm TW022WA02 Neodymium Dome Ferro Fluid 4 Ohm Images
Wavecor Speaker Driver - TW022WA2 - 22mm Neodymium Chambered Textile Tweeter- 4 Ohm
Description
TW022WA02 is a compact 22 mm neodymium tweeter for applications, where small size is important, while still requiring the highest level of performance. The best of two worlds? The design with 22 mm voice coil and wide surround caters for both applications that would normally require traditional ¾” tweeters and those, where 1” tweeters would usually be preferred. In order to keep distortion and resonance frequency low the TW022WA02 is designed around an external neodymium ring magnet in order to allow for a larger internal volume than that of traditional neodymium tweeters. There is a version of TW022WA02 without face plate available for manufacturers, for building the unit directly into the cabinet baffle. The part number of this version is TW022WA01 and the electrical / acoustical specifications are identical to that of TW022WA02.
Features
- 22 mm design for optimal compromise between on- and off-axis frequency response, resonance frequency, and power handling
- External ring neodymium magnet for lower resonance frequency and distortion
- Precision-coated textile diaphragm for improved consistency and high-frequency extension
- Optimized dome shape for ultra high frequency cutoff
- Vented voice coil former for reduced distortion and compression
- Copper-clad aluminium voice coil wire offering lower moving mass for improved efficiency and transient response
- Build-in cavities under dome/edge to equalise pressure - for lower distortion and lower resonance frequency
- High-stability ferro fluid for increased power handling
- Flexible lead wires for higher power handling and larger excursion
- Gold plated terminals to prevent oxidation and ensure long-term reliable connection
- Delivered with foam gasket attached for hassle-free mounting and secure cabinet sealing
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 |
| Nominal size | 22 | mm | |
| Nominal impedance | 4 | Ohm | |
| Recommended frequency range |
2.5-30 | kHz | |
| 1, 4 | Sensitivity, 2.83V/1m (average SPL in range 2- 20 kHz) | 88.5 | dB |
| 2 | Power handling, short term, IEC 268-5, 3.0 kHz @ 12dB/oct. | W | |
| 2 | Power handling, long term, IEC 268-5, 3.0 kHz @ 12dB/oct. | W | |
| 2 | Power handling, continuous, IEC 268-5, 3.0 kHz @ 12dB/oct. | W | |
| Effective radiating area, Sd | 6.1 | cm2 | |
| 3, 4, | Resonance frequency (free air, no baffle), Fs | 1.150 | kHz |
| Moving mass, incl. air (free air, no baffle), Mms | 0.28 | g | |
| 3 | Force factor, Bxl | 1.33 | - |
| 3, 4 | Suspension compliance, Cms | 68 | mm/N |
| 3, 4 | Equivalent air volume, Vas | 3.6 | ml |
| 3, 4 | Mechanical resistance, Rms | 1.33 | Ns/m |
| 3, 4 | Mechanical Q, Qms | 1.53 | - |
| 3, 4 | Electrical Q, Qes | 4.1 | - |
| 3, 4 | Total Q, Qts | 1.11 | - |
| 4 | Voice coil resistance, RDC | 3.6 | Ohm |
| 5 | Voice coil inductance, Le (measured at 20 kHz) | 36 | uH |
| Voice coil inside diameter | 22 | mm | |
| Voice coil winding height | 1.6 | mm | |
| Air gap height | 2.5 | mm | |
| Theoretical linear motor stroke, Xmax | ±0.45 | mm | |
| Magnet weight | g | ||
| Total unit net weight excl. packaging | 0.06 | kg | |
| 3, 4 | Krm | 2.5 | mOhm |
| 3, 4 | Erm | 1.14 | - |
| 3, 4 | Kxm | 3.0 | mH |
| 3, 4 | Exm | 0.56 | - |
Note 2 Tested in free air (no baffle)
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. This more accurate transducer model is described in a technical paper (PDF) here.
Note 6 Calculated as the area inside the middle of the surround.
Note 7 Determined by physical weighing of the moving parts including the inner half of the surround.
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