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The 2" transducers FR055OM01 (4 ohm) and FR055OM02 (8 ohm) were designed especially for compact high quality multimedia and lifestyle speakers, where sound reproduction without compromises is required, while still keeping size small.
They are cost effective designs suited for larger scale manufacturers.
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Downloads
SPL and impedance response curves as text files
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FR055OM01 on-axis SPL response
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FR055OM01 impedance response
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FR055OM02 on-axis SPL response
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FR055OM02 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) or 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
- Rigid paper cone to ensure piston motion even at high levels
- True full range extension to 20 kHz
- 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
- New damper (spider) woven of a mix of polymers and natural fibers for improved durability
- Gold plated terminals to ensure long-term trouble free connection
- Delivered with foam gasket attached for hassle-free mounting and secure cabinet sealing
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NOMINAL SPECIFICATIONS
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Notes
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Parameter
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FR055OM01
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FR055OM02
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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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full range
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full range
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[kHz]
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1, 4
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Sensitivity, 2.83V/1m (average SPL in range 200 - 20 kHz)
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85
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82
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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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4
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4
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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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130
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135
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[Hz]
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Moving mass, incl. air (free air, no baffle), Mms
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1.5
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1.4
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[g]
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3, 4
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Force factor, Bxl
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2.0
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2.5
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[N/A]
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3, 4, 6
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Suspension compliance, Cms
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1.0
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1.0
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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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0.35
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0.35
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[lit.]
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3, 4, 6
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Mechanical resistance, Rms
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0.15
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0.15
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[Ns/m]
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3, 4, 6
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Mechanical Q, Qms
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8.2
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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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0.96
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1.23
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[-]
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3, 4, 6
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Total Q, Qts
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0.86
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1.06
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[-]
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4
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Voice coil resistance, RDC
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3.15
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6.5
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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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0.068
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0.112
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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
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4
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[mm]
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Air gap height
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2
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2
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[mm]
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Theoretical linear motor stroke, Xmax
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+/-1
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+/-1
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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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[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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After burn-in specifications are measured 12 hours after exciting the transducer by a 20 Hz sine wave for 2 hours at level 4.0/5.7 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. FR055OM01-01
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4 ohm version, packed in bulk (industrial) packaging
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Part no. FR055OM02-01
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8 ohm version, packed in bulk (industrial) packaging
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Latest update: August 31, 2021
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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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