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FR055WA03/04     2 neodymium, alu-cone fullranges, 4/8 ohm

 

 

 

 

 

The 2” fullrange transducers FR055WA03 (4 ohm) and FR055WA04 (8 ohm) were designed especially for high quality multimedia and lifestyle speakers, and for personal audio products, where sound reproduction without compromises is required.
Will additionally work well as a midrange/treble transducer in small speaker products in combination with for instance a small subwoofer unit.

Frequency resp.
Specifications
Dimensions
Distortion
Ordering info

FR055WA03/04 photo

Downloads
SPL and impedance response curves as text files

FR055WA03 SPL response

FR055WA03 on-axis SPL response

FR055WA03 impedance response

FR055WA03 impedance response

FR055WA04 SPL response

FR055WA04 on-axis SPL response

FR055WA04 impedance response

FR055WA04 impedance response

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.

FEATURES

  • True full-range design with on-axis output beyond 20kHz
  • Upgraded design with higher efficiency and improved high frequency output
  • Dual neodymium magnet structure for high efficiency and almost ideal magnetical shielding
  • 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
  • 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

NOMINAL SPECIFICATIONS

Notes

  Parameter

FR055WA03

FR055WA04

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

2

2

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

full range

full range

[kHz]

1, 4

Sensitivity, 2.83V/1m (average SPL in range 200 - 20,000 Hz)

86.5

83

[dB]

2, 4

Power handling, short term, IEC 268-5, no additional filtering

40

40

[W]

2, 4

Power handling, long term, IEC 268-5, no additional filtering

20

20

[W]

2

Power handling, continuous, IEC 268-5, no additional filtering

4

4

[W]

 

Effective radiating area, Sd

15.6

15.6

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

142

128

145

131

[Hz]

 

Moving mass, incl. air (free air, no baffle), Mms

1.6

1.54

[g]

3, 4

Force factor, Bxl

2.7

3.3

[N/A]

3, 4, 6

Suspension compliance, Cms

0.785

0.96

0.785

0.96

[mm/N]

3, 4, 6

Equivalent air volume, Vas

0.27

0.33

0.27

0.33

[lit.]

3, 4, 6

Mechanical resistance, Rms

0.16

0.16

0.16

0.16

[Ns/m]

3, 4, 6

Mechanical Q, Qms

8.9

8.1

8.8

7.9

[-]

3, 4, 6

Electrical Q, Qes

0.61

0.55

0.80

0.70

[-]

3, 4, 6

Total Q, Qts

0.57

0.51

0.73

0.66

[-]

4

Voice coil resistance, RDC

3.1

6.2

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

0.062

0.10

[mH]

 

Voice coil inside diameter

22

22

[mm]

 

Voice coil winding height

4.7

4.7

[mm]

 

Air gap height

2.0

2.0

[mm]

 

Theoretical linear motor stroke, Xmax

+/-1.35

+/-1.35

[mm]

 

Magnet weight

27

27

[g]

 

Total unit net weight excl. packaging

0.083

0.083

[kg]

3, 4, 5

Krm

 

 

[mohm]

3, 4, 5

Erm

 

 

[-]

3, 4, 5

Kxm

 

 

[mH]

3, 4, 5

Exm

 

 

[-]

Note 1

Measured in infinite baffle.

Note 2

Tested in free air (no cabinet).

Note 3

Measured using a semi-constant current source, nominal level 2 mA.

Note 4

Measured at 25 deg. C

Note 5

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.

Note 6

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.

FREQUENCY RESPONSE

FR055WA03 SPL response

Measuring conditions, SPL
Driver mounting: Flush in infinite
     baffle, back side open (no cabinet)
Microphone distance: 1.0 m
Input signal: 2.83 VRMS stepped sine wave
Smoothing: 1/6 oct.

Measuring conditions, impedance
Driver mounting: Free air, no baffle,
     back side open (no cabinet)
Input signal: Stepped sine wave, semi-
     current-drive, nominal current 2 mA
Smoothing: None

FR055WA03 impedance response
FR055WA04 SPL response

Measuring conditions, SPL
Driver mounting: Flush in infinite
     baffle, back side open (no cabinet)
Microphone distance: 1.0 m
Input signal: 2.83 VRMS stepped sine wave
Smoothing: 1/6 oct.

Measuring conditions, impedance
Driver mounting: Free air, no baffle,
     back side open (no cabinet)
Input signal: Stepped sine wave, semi-
     current-drive, nominal current 2 mA
Smoothing: None

FR055WA04 impedance response

HARMONIC DISTORTION

FR055WA03 harmonic distortion

Measuring conditions, harmonic distortion
Driver mounting: In sealed, heavily stuffed enclosure, internal volume 0.50 lit.,
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 1.26 VRMS (FR055WA03) / 1.79 VRMS (FR055WA04)
Smoothing: 1/6 oct.

FR055WA04 harmonic distortion

OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)

FR055WA03/04 outline drawing PDF
FR055WA03/04 outline drawing

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals

Plating, both terminals: GOLD

PACKAGING AND ORDERING INFORMATION

Part no. FR055WA03-01

4 ohm version, packed in pairs

Part no. FR055WA03-02

4 ohm version, packed in bulk (industrial) packaging

Part no. FR055WA04-01

8 ohm version, packed in pairs

Part no. FR055WA04-02

8 ohm version, packed in bulk (industrial) packaging

Latest update: June 12, 2022

 

Specifications are subject to change without any further notice.
Copyright © 2006-2022 by Wavecor Ltd., China. All rights reserved.

 

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MORE INFO

FR055WA03/04 specificationsPDF data sheet

 

 

 

 

 

 

 

 

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