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- Dual-Piston design combining a 22 mm textile dome with a 45 mm ceramic cone. Precision textile dome ensuring high frequency extension, ceramic cone adding low frequency output and efficiency
- Copper clad center pole yielding very low voice coil inductance for reduced distortion and increased high frequency output
- Front-side reflection reducing foam ring
- Flat low-damping IIR surround
- Vented through to a damped rear, die cast, chamber for low resonance frequency and low distortion
- Alu chassis with built-in heat sink for increased long-term power handling
- Dual-neodymium magnet structure
- Optimized dome shape for ultra-high frequency cut-off
- Underhung voice coil design for improved linearity
- 22 mm voice coil design with high power handling, and low resonance frequency
- Copper-clad aluminium voice coil wire offering lower moving mass for improved efficiency and transient response
- 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
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Notes
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Parameter
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TW045WA01
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Unit
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Nominal size
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22/45
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[mm]
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Nominal impedance
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4
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[ohm]
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Recommended frequency range
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2 - 40
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[kHz]
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1, 4
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Sensitivity, 2.83V/1m (average SPL in range 2 - 20 kHz)
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95
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[dB]
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2
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Power handling, short term, IEC 268-5, 3.0 kHz@12dB/oct.
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1,300
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[W]
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2
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Power handling, long term, IEC 268-5, 3.0 kHz@12dB/oct.
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450
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[W]
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2
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Power handling, continuous, IEC 268-5, 3.0 kHz@12dB/oct.
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180
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[W]
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Effective radiating area, Sd
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20
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[sq.cm]
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3, 4, 6
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Resonance frequency (free air, no baffle), Fs
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840
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[Hz]
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Moving mass, incl. air (free air, no baffle), Mms
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1.12
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[g]
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3
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Force factor, Bxl
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3.0
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[N/A]
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3, 4, 6
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Suspension compliance, Cms
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0.032
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[mm/N]
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3, 4, 6
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Equivalent air volume, Vas
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18
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[mlit.]
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3, 4, 6
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Mechanical resistance, Rms
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1.34
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[Ns/m]
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3, 4, 6
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Mechanical Q, Qms
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4.4
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[-]
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3, 4, 6
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Electrical Q, Qes
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1.85
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[-]
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3, 4, 6
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Total Q, Qts
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1.30
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[-]
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4
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Voice coil resistance, RDC
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2.9
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[ohm]
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5
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Voice coil inductance, Le (measured at 20 kHz)
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[μH]
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Voice coil inside diameter
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22
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[mm]
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Voice coil winding height
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2.5
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[mm]
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Air gap height
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4.0
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[mm]
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Theoretical linear motor stroke, Xmax
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+/-0.75
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[mm]
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Magnet weight
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45.7 + 8.3
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[g]
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Total unit net weight excl. packaging
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270
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[g]
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3, 4, 5
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Krm
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[mohm]
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3, 4, 5
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Erm
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[-]
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3, 4, 5
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Kxm
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[mH]
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3, 4, 5
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Exm
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[-]
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Note 1
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Measured in infinite baffle.
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Note 2
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Tested in free air (no cabinet).
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Note 3
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Measured using a semi-constant current source, nominal level 2 mA.
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Note 4
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Measured at 25 deg. C
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Note 5
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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.
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Note 6
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Measured before burn in
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HARMONIC DISTORTION
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OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)
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Part no. TW045WA01-01
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4 ohm version, individual packaging (one pair per box)
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Part no. TW045WA01-02
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4 ohm version, bulk packaging
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Latest update: February 10, 2023
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Specifications are subject to change without any further notice.
Copyright © 2006-2023 by Wavecor Ltd., China. All rights reserved.
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MORE INFO
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 PDF data sheet
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TW045WA01 test in Voice Coil Magazine
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