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Downloads
SPL and impedance response curves as text files
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FR055WA01 on-axis SPL response
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FR055WA01 impedance response
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FR055WA02 on-axis SPL response
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FR055WA02 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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- True full-range design with on-axis output to beyond 20kHz
- Neodymium magnet structure for high efficiency and almost ideal magnetically shielding
- Black anodized alu cone for better heat transfer
- Vented polymer chassis for lower air flow speed reducing audible distortion
- Vented voice coil former for reduced distortion and compression
- Heavy-duty black fiber glass voice coil bobbin to reduce mechanical losses resulting in better dynamic performance and low-level details
- Large motor with 22 mm voice coil diameter for better control and power handling
- Low-loss suspension (high Qm) for better reproduction of details and dynamics
- Black 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
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NOMINAL SPECIFICATIONS
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Notes
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Parameter
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FR055WA01
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FR055WA02
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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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2
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2
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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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fullrange
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fullrange
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[kHz]
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1, 4
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Sensitivity, 2.83V/1m (average SPL in range 200 - 10,000 Hz)
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84.5
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81.5
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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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40
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40
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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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20
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20
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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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4
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4
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[W]
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2
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Power handling, continuous, IEC 268-5, 135 Hz HP 12dB/oct.
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10
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10
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[W]
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Effective radiating area, Sd
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15.6
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15.6
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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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142
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128
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145
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131
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[Hz]
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Moving mass, incl. air (free air, no baffle), Mms
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1.60
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1.54
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[g]
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3, 4
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Force factor, Bxl
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2.09
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2.67
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[N/A]
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3, 4, 6
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Suspension compliance, Cms
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0.785
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0.96
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0.785
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0.96
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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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0.27
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0.33
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0.27
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0.33
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[lit.]
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3, 4, 6
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Mechanical resistance, Rms
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0.16
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0.16
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0.16
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0.16
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[Ns/m]
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3, 4, 6
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Mechanical Q, Qms
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8.9
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8.1
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8.8
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7.9
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[-]
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3, 4, 6
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Electrical Q, Qes
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1.01
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0.92
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1.22
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1.10
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[-]
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3, 4, 6
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Total Q, Qts
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0.91
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0.82
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1.07
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0.97
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[-]
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4
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Voice coil resistance, RDC
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3.1
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6.2
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[ohm]
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5
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Voice coil inductance, Le (measured at 10 kHz)
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0.079
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0.13
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[mH]
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Voice coil inside diameter
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22
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22
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[mm]
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Voice coil winding height
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4.7
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4.7
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[mm]
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Air gap height
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2.0
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2.0
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[mm]
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Theoretical linear motor stroke, Xmax
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+/-1.35
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+/-1.35
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[mm]
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Magnet weight
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19
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19
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[g]
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Total unit net weight excl. packaging
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0.071
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0.071
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[kg]
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3, 4, 5
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Krm
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0.020
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0.022
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[mohm]
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3, 4, 5
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Erm
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1.00
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1.04
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[-]
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3, 4, 5
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Kxm
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0.77
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1.26
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[mH]
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3, 4, 5
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Exm
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0.77
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0.77
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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 exiting the transducer by a continuous sine wave for 2 hours. The sine wave frequency equals the transducer Fs, at level 3.0/4.65 VRMS (4/8 ohm version).
Units are 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. FR055WA01-01
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4 ohm version, packed in pairs
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Part no. FR055WA01-02
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4 ohm version, packed in bulk (industrial) packaging
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Part no. FR055WA02-01
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8 ohm version, packed in pairs
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Part no. FR055WA02-02
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8 ohm version, packed in bulk (industrial) packaging
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Latest update: June 12, 2022
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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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