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WF182BD13/14/15/16     7 die cast, Kevlar/Carbon fibre cone mid/woofers

 

 

 

 

 

 

Balanced Drive

The 7” transducers WF182BD13 (round, 4 ohm), WF182BD15 (truncated, 4 ohm), WF182BD14 (round, 8 ohm), and WF182BD16 (truncated, 8 ohm) were designed as high performance bass and midrange units for compact monitors and high-end hi-fi speakers.

Frequency resp.
Downloads
Specifications
Harmonic distortion
Dimensions
Ordering info

Above: Round version (WF182BD13, WF182BD14)
Below: Truncated version (WF182BD15, WF182BD16)

WF182BD15-front-view

FEATURES

 

  • New cone of interwoven Kevlar/Carbon fibers, a new reference for the combination of low mass, rigidness, and damping - highly beneficial properties for midrange reproduction
  • Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
  • Vented, inverted center dome for reduced compression
  • 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
  • Rigid die cast alu chassis with extensive venting for lower air flow speed reducing audible distortion
  • Vented voice coil former for reduced distortion and compression
  • Heavy-duty black fiber glass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
  • Large motor with 1.25” voice coil diameter for better control and power handling
  • Built-in alu field-stabilizing ring for reduced distortion at high levels
  • 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

FREQUENCY RESPONSE

WF182BD13/15 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 LogChirp, 64k, Hanning/2
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

WF182BD13/15 impedance response
WF182BD14/16 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 LogChirp, 64k, Hanning/2
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

WF182BD14/16 impedance response

Downloads
SPL and impedance response curves as text files

WF182BD13/15 SPL response

WF182BD13/15 SPL response

WF182BD13/15 impedance response

WF182BD13/15 impedance responsee

WF182BD14/16 SPL response

WF182BD14/16 SPL response

WF182BD14/16 impedance response

WF182BD14/16 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.

NOMINAL SPECIFICATIONS

Notes

  Parameter

WF182BD13/15

WF182BD14/16

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

7

7

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

2.5

2.5

[kHz]

1, 4

Sensitivity, 2.83V/1m (average SPL in range 300 - 1,000 Hz)

91

88

[dB]

2, 4

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

350

350

[W]

2, 4

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

250

250

[W]

2, 4

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

80

80

[W]

 

Effective radiating area, Sd

117

117

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

38

36

39

37

[Hz]

 

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

16

15.5

[g]

3, 4

Force factor, Bxl

6.9

8.5

[N/A]

3, 4, 6

Suspension compliance, Cms

1.07

1.18

1.07

1.18

[mm/N]

3, 4, 6

Equivalent air volume, Vas

20.8

23

20.8

23

[lit.]

3, 4, 6

Mechanical resistance, Rms

0.35

0.35

0.35

0.35

[Ns/m]

3, 4, 6

Mechanical Q, Qms

10.9

10.5

10.7

10.3

[-]

3, 4, 6

Electrical Q, Qes

0.27

0.26

0.33

0.31

[-]

3, 4, 6

Total Q, Qts

0.26

0.25

0.32

0.30

[-]

4

Voice coil resistance, RDC

3.3

6.3

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

 

 

[mH]

 

Voice coil inside diameter

32

32

[mm]

 

Voice coil winding height

16

16

[mm]

 

Air gap height

5

5

[mm]

 

Theoretical linear motor stroke, Xmax

+/-5.5

+/-5.5

[mm]

 

Magnet weight

880

880

[g]

 

Total unit net weight excl. packaging

2.4

2.4

[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 at least 12 hours after exciting the transducer by a sine wave at the frequency of Fs for 2 hours at level 7/11 VRMS (4/8 ohm version). The unit is not burned in before shipping.
 

HARMONIC DISTORTION

WF182BD13/15 harmonic distortion

Measuring conditions, harmonic distortion
Driver mounting: In sealed enclosure, internal volume 5 lit.,
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 6.2 VRMS (WF182BD13/15) / 8.0 VRMS (WF182BD14/16)
Smoothing: 1/12 oct.

WF182BD14/16 harmonic distortion

OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)

WF182BD13/14/15/16 outline drawing
WF182BD13_14-outline-drawing

Truncated dimension
(other dimensions as round version)

Truncated version

TERMINAL NOMINAL DIMENSIONS (mm)

Terminal dimensions

PACKAGING AND ORDERING INFORMATION

Part no. WF182BD13-01

4 ohm version, round, individual packaging (one piece per box)

Part no. WF182BD13-02

4 ohm version, round, bulk packaging

Part no. WF182BD14-01

8 ohm version, round, individual packaging (one piece per box)

Part no. WF182BD14-02

8 ohm version, round, bulk packaging

Part no. WF182BD15-01

4 ohm version, truncated, individual packaging (one piece per box)

Part no. WF182BD15-02

4 ohm version, truncated, bulk packaging

Part no. WF182BD16-01

8 ohm version, truncated, individual packaging (one piece per box)

Part no. WF182BD16-02

8 ohm version, truncated, bulk packaging

Latest update: Jan.30, 2023

 

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

WF182BD13/14/15/16 specificationsPDF data sheet

 

Balanced Drive technical paperBalanced Drive technical paper

 

 

 

 

 

 

 

 

 

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