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WF182BD03/04/07/08     7 die cast, paper cone mid/woofers, 4/8 ohm

 

 

 

 

Wavecor Balanced Drive Technology

The 7” transducers WF182BD03 and WF182BD07 (both 4 ohm) and WF182BD04 and WF182BD08 (both 8 ohm) were designed as high performance bass and midrange units for  monitors and high-end hi-fi speakers. They offer outstanding deep bass performance and dynamic and detailed midrange.

Frequency resp.
Specifications
Dimensions
Ordering info

WF182BD03_04-rear_sideA

FEATURES

WF182BD03_04

WF182BD03 and WF182BD04 (round frame).

WF182BD07_08

WF182BD07 and WF182BD08 (truncated frame).

  • Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced 2nd order harmonic distortion
  • 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 coated semi-air-dried paper cone
  • 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
  • Vented center pole with dual flares for reduced noise level at large cone excursions
  • Heavy-duty black fiber glass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
  • Large motor with 39 mm 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

WF182BD03 SPL & IMP response

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

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

WF182BD04 SPL & IMP response

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

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

NOMINAL SPECIFICATIONS

Notes

  Parameter

WF182BD03 / WF182BD07

WF182BD04 / WF182BD08

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

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

91

88

[dB]

2

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

 

 

[W]

2

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

 

 

[W]

2

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

80

80

[W]

 

Effective radiating area, Sd

131

131

[sq.cm]

3, 6

Resonance frequency (free air, no baffle), Fs

39

33.8

40

33.4

[Hz]

 

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

16.7

16.1

[g]

3

Force factor, Bxl

6.75

8.5

[N/A]

3, 6

Suspension compliance, Cms

1.0

1.33

1.0

1.33

[mm/N]

3, 6

Equivalent air volume, Vas

24.4

32.4

24.4

32.4

[lit.]

3, 6

Mechanical resistance, Rms

0.37

0.43

0.37

0.43

[Ns/m]

3, 6

Mechanical Q, Qms

11

8.2

10.9

8.1

[-]

3, 6

Electrical Q, Qes

0.30

0.26

0.35

0.30

[-]

3, 6

Total Q, Qts

0.29

0.25

0.34

0.29

[-]

4

Voice coil resistance, RDC

3.3

6.3

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

0.088

0.14

[mH]

 

Voice coil inside diameter

39

39

[mm]

 

Voice coil winding height

16

16

[mm]

 

Air gap height

5

5

[mm]

 

Magnet weight

885

885

[g]

 

Total unit net weight excl. packaging

2.3

2.3

[kg]

3, 5

Krm

33

54

[mohm]

3, 5

Erm

0.42

0.40

[-]

3, 5

Kxm

157

347

[mH]

3, 5

Exm

0.19

0.14

[-]

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 20 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 20 Hz sine wave for 2 hours at level 10/14.1 VRMS (4/8 ohm version). The unit is not burned in before shipping.
 

OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)

WF182BD03/04 outline drawing
WF182BD03/04-outline-drawing

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

PACKAGING AND ORDERING INFORMATION

Part no. WF182BD03-01

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

Part no. WF182BD03-02

4 ohm version, bulk packaging

Part no. WF182BD04-01

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

Part no. WF182BD04-02

8 ohm version, bulk packaging

Part no. WF182BD07-01

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

Part no. WF182BD07-02

4 ohm version, truncated frame, bulk packaging

Part no. WF182BD08-01

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

Part no. WF182BD09-02

8 ohm version, truncated frame, bulk packaging

Latest update: September 9, 2018
 

 

Specifications are subject to change without any further notice.
Copyright © 2006-2018 by Wavecor Ltd., Guangzhou, China. All rights reserved.

 

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MORE INFO

WF182BD03/04 specificationsPDF data sheet
(1.09 MB)

 

Balanced Drive technical paperBalanced Drive technical paper (2.34 MB)

 

WF182BD03 REVIEW
by HiFiCompass
Aug. 2, 2018

 

 

List of all mid/woofers

 

All Wavecor drive units

 

Technical pages

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