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The 3.25" transducers SW084OM01 (4 ohm) and SW084OM02 (8 ohm) were designed to provide real and undistorted bass from small enclosures. Examples of applications are high quality multimedia and lifestyle speakers and personal audio products, where bass reproduction without compromises is required.
Works well as dedicated subwoofer in combination with small 2-way designs. Another obvious application is as the woofer portion in a 2-way speaker in combination with a small fullrange unit (ideally like FR040WA)
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Downloads
SPL and impedance response curves as text files
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SW084OM01 on-axis SPL response
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SW084OM01 impedance response
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SW084OM02 on-axis SPL response
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SW084OM02 impedance response
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Important!
Please observe that these text files for download are actual measurements of the drivers measured in infinite baffle and without any enclosure. Measuring the drivers in a finite baffle (like the baffle of most speaker cabinets) and in any size of enclosure will lead to different response curves.
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FEATURES
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- FEA optimized suspension for perfect symmetry, reducing even order harmonic distortion
- Balanced Drive motor with perfect force factor symmetry for reduced distortion
- Long linear stroke, ensuring low distortion at high output levels
- Rigid paper cones to ensure piston motion even at high levels - for reduced distortion
- Vented voice coil former and magnet center pole for reduced distortion and compression
- Vented chassis for lower air flow speed reducing audible distortion
- Heavy-duty black fiber glass voice coil bobbin to increase power handling and reduce mechanical losses resulting in better dynamic performance and low-level details
- Progressive suspension with optimized compromise between linearity and soft clipping
- New damper (spider) woven of a mix of polymers and natural fibers for improved durability
- Gold plated terminals to prevent oxidation for long-term reliable connection
- Delivered with foam gasket attached to the frame for hassle-free mounting and secure enclosure sealing
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NOMINAL SPECIFICATIONS
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Notes
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Parameter
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SW084OM01
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SW084OM02
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Unit
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Before burn-in
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After burn-in
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Before burn-in
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After burn-in
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Nominal size
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3.25
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3.25
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[inch.]
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Nominal impedance
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4
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8
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[ohm]
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Recommended max. upper frequency limit
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2
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2
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[kHz]
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1, 4
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Sensitivity, 2.83V/1m (average SPL in range 200 - 2,000 Hz)
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86
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83
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[dB]
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2, 4
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Power handling, short term, IEC 268-5, no additional filtering
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[W]
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2, 4
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Power handling, long term, IEC 268-5, no additional filtering
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[W]
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2
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Power handling, continuous, IEC 268-5, no additional filtering
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40
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40
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[W]
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Effective radiating area, Sd
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33.5
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33.5
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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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74
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77
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[Hz]
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Moving mass, incl. air (free air, no baffle), Mms
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4.35
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4.05
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[g]
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3, 4
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Force factor, Bxl
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3.56
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4.58
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[N/A]
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3, 4, 6
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Suspension compliance, Cms
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1.07
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1.07
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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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1.70
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1.70
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[lit.]
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3, 4, 6
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Mechanical resistance, Rms
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0.22
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0.22
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[Ns/m]
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3, 4, 6
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Mechanical Q, Qms
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9.2
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8.8
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[-]
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3, 4, 6
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Electrical Q, Qes
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0.46
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0.57
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[-]
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3, 4, 6
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Total Q, Qts
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0.44
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0.53
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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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6.1
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[ohm]
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5
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Voice coil inductance, Le (measured at 1 kHz)
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0.40
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0.72
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[mH]
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Voice coil inside diameter
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26
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26
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[mm]
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Voice coil winding height
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12
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12
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[mm]
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Air gap height
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3
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3
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[mm]
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Theoretical linear motor stroke, Xmax
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+/-4.5
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+/-4.5
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[mm]
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Magnet weight
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[g]
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Total unit net weight excl. packaging
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[kg]
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3, 4, 5
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Krm
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0.52
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1.48
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[mohm]
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3, 4, 5
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Erm
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0.82
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0.76
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[-]
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3, 4, 5
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Kxm
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3.9
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6.3
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[mH]
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3, 4, 5
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Exm
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0.71
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0.71
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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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After burn-in specifications are measured 12 hours after exciting the transducer by a 20 Hz sine wave for 2 hours at level 4.0/5.65 VRMS (4/8 ohm version). The unit is not burned in before shipping.
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FREQUENCY RESPONSE
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HARMONIC DISTORTION
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OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)
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Part no. SW084OM01-01
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4 ohm version, packed in bulk (industrial) packaging
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Part no. SW084OM02-01
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8 ohm version, packed in bulk (industrial) packaging
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Latest update: March 1, 2024
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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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