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True full-range design with on-axis output to beyond 25kHz
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Dual neodymium magnet structure for high efficiency and almost ideal magnetically shielding
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Copper cap on center pole to reduce voice coil inductance and to minimize variations in voice coil inductance as a function of voice coil position
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Black anodized alu cone for better heat transfer
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Optimized off-axis response
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Vented polymer chassis for lower air flow speed reducing audible distortion
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Vented voice coil former for reduced distortion and compression
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Heavy-duty black fiber glass voice coil bobbin to reduce mechanical losses resulting in better dynamic performance and low-level details
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Large motor with 22 mm voice coil diameter for better control and power handling
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Low-loss suspension (high Qm) for better reproduction of details and dynamics
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Black motor parts for better heat transfer to the surrounding air
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Conex spider for better durability under extreme conditions
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Gold plated terminals to ensure long-term trouble free connection
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FREQUENCY RESPONSE
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NOMINAL SPECIFICATIONS
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Notes
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Parameter
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FR070WA01
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FR070WA02
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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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2¾
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2¾
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4
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8
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Recommended max. upper frequency limit
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full range
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full range
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1, 5
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Sensitivity, 2.83V/1m (average SPL in range 400 - 1,000 Hz)
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87
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84
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2
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Power handling, short term, IEC 268-5, no additional filtering
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2
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Power handling, long term, IEC 268-5, no additional filtering
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2
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Power handling, continuous, IEC 268-5, no additional filtering
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10
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10
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Effective radiating area, Sd
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21
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21
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3, 5, 7
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Resonance frequency (free air, no baffle), Fs
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125
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118
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129
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122
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Moving mass, incl. air (free air, no baffle), Mms
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1.9
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1.8
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3
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2.8
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3.5
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3, 5, 7
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Suspension compliance, Cms
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0.85
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0.95
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0.85
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0.95
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3, 5, 7
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Equivalent air volume, Vas
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0.53
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0.59
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0.53
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0.59
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3, 5, 7
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Mechanical resistance, Rms
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0.15
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0.14
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0.15
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0.14
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3, 5, 7
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10
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10
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10
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10
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3, 5, 7
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0.63
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0.60
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0.76
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0.72
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3, 5, 7
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0.59
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0.56
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0.71
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0.67
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4
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Voice coil resistance, RDC
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3.3
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6.4
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6
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Voice coil inductance, Le (measured at 10 kHz)
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71
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110
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Voice coil inside diameter
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22
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22
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Voice coil winding height
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6
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6
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3
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3
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25+10
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25+10
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Total unit net weight excl. packaging
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0.14
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0.14
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3, 6
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2.9
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4.6
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3, 6
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0.59
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0.57
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3, 6
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44
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34
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3, 6
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0.32
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0.39
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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 20 deg. C
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Note 5
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Measured at 25 deg. C
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Note 6
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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 7
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After-burn-in specifications are measured at least 12 hours after exiting the transducer by a 20 Hz sine wave for 2 hours at level 2.83/4.0 VRMS (4/8 ohm version). Unit are not burned in before shipping.
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OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)
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Terminal plating:
Gold
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CUMULATIVE SPECTRAL DECAY PLOT
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PACKAGING AND ORDERING INFORMATION
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4 ohm version, individual packaging (one pair per box)
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4 ohm version, bulk packaging
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8 ohm version, individual packaging (one pair per box)
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8 ohm version, bulk packaging
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Latest update: Dec. 27, 2009
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Specifications are subject to change without any further notice.
Copyright © 2006-2009 by Wavecor Ltd., Guangzhou, China. All rights reserved.
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MORE INFO
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