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WF152BD09/10/11/12     6 die cast, Kevlar/Carbon fibre cone mid/woofers

 

 

 

 

 

 

Balanced Drive

The 6” transducers WF152BD09 (round, 4 ohm), WF152BD11 (truncated, 4 ohm), WF152BD10 (round, 8 ohm), and WF152BD12 (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 (WF152BD09, WF152BD10)
Below: Truncated version (WF152BD11, WF152BD12)

WF152BD10/12 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

WF152BD09/11 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

WF152BD09/11 impedance response
WF152BD10/12 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

WF152BD10/12 impedance response

Downloads
SPL and impedance response curves as text files

WF152BD09/11 SPL response

WF152BD09/11 SPL response

WF152BD09/11 impedance response

WF152BD09/11 impedance response

WF152BD10/12 SPL response

WF152BD10/12 SPL response

WF152BD10/12 impedance response

WF152BD10/12 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

WF152BD09/11

WF152BD10/12

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

6

6

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

3

3

[kHz]

1, 4

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

90

87

[dB]

2, 4

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

470

470

[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

70

70

[W]

 

Effective radiating area, Sd

85

85

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

52

49

53

46

[Hz]

 

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

11.0

10.6

[g]

3, 4

Force factor, Bxl

5.8

7.2

[N/A]

3, 4, 6

Suspension compliance, Cms

0.84

0.94

0.84

0.94

[mm/N]

3, 4, 6

Equivalent air volume, Vas

8.6

9.6

8.6

9.6

[lit.]

3, 4, 6

Mechanical resistance, Rms

0.33

0.33

0.33

0.33

[Ns/m]

3, 4, 6

Mechanical Q, Qms

11.1

10.5

10.9

10.3

[-]

3, 4, 6

Electrical Q, Qes

0.35

0.33

0.42

0.40

[-]

3, 4, 6

Total Q, Qts

0.34

0.32

0.40

0.38

[-]

4

Voice coil resistance, RDC

3.2

6.1

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

 

 

[mH]

 

Voice coil inside diameter

32

32

[mm]

 

Voice coil winding height

14

14

[mm]

 

Air gap height

5

5

[mm]

 

Theoretical linear motor stroke, Xmax

+/-4.5

+/-4.5

[mm]

 

Magnet weight

650

650

[g]

 

Total unit net weight excl. packaging

1.7

1.7

[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 7/9 VRMS (4/8 ohm version). The unit is not burned in before shipping.
 

HARMONIC DISTORTION

WF152BD09/11 harmonic distortion

Measuring conditions, harmonic distortion
Driver mounting: In sealed, heavily stuffed enclosure, internal volume 7 lit.,
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 5.3 VRMS (WF152BD09/11) / 6.6 VRMS (WF152BD10/12)
Smoothing: 1/12 oct.

WF152BD10/12 harmonic distortion

OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)

WF152BD09/10/11/12 outline drawing
WF152BD09/11 outline drawing

Truncated dimension
(other dimensions as round version)

Truncated outline

TERMINAL NOMINAL DIMENSIONS (mm)

Terminal dimensions

PACKAGING AND ORDERING INFORMATION

Part no. WF152BD09-01

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

Part no. WF152BD09-02

4 ohm version, round, bulk packaging

Part no. WF152BD10-01

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

Part no. WF152BD10-02

8 ohm version, round, bulk packaging

Part no. WF152BD11-01

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

Part no. WF152BD11-02

4 ohm version, truncated, bulk packaging

Part no. WF152BD12-01

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

Part no. WF152BD12-02

8 ohm version, truncated, bulk packaging

Latest update: Jan.5, 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

WF152BD09/10/11/12 specificationsPDF data sheet

 

Balanced Drive technical paperBalanced Drive technical paper (2.34 MB)

 

 

 

 

 

 

 

 

 

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