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WF118WA07/08     4" paper cone mid/woofer, 4/8 ohm

 

 

 

 

 

WF118WA07 (4 ohm) and WF118WA08 (8 ohm) are 4" mid/woofers designed for demanding bass and midrange applications. They work equally well for hi-fi, high quality home theater systems, multimedia setups, or high quality personal audio systems.
With the new SLIM-line frame design and a new suspension optimized for high-level bass output, these units are perfectly suited for compact high performance speakers.

Frequency resp.
Specifications
Dimensions
Distortion
Decay spectrum
Ordering info

WF118WA07_08-275px

Downloads
SPL and impedance response curves as text files

WF118WA07 SPL response

WF118WA07 SPL response

WF118WA07 impedance response

WF118WA07 impedance response

WF118WA08 SPL response

WF118WA08 SPL response

WF118WA08 impedance response

WF118WA08 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

  • FEA optimized suspension for perfect symmetry, reducing even order harmonic distortion
  • Balanced Drive motor with perfect force factor symmetry for reduced distortion
  • Alu field-stabilizing ring inside magnet assembly for reduced distortion at high levels
  • Vented voice coil former for reduced distortion and compression
  • Vented chassis for lower air flow speed reducing audible distortion
  • Heavy-duty black fiber glass voice coil bobbin to increase power handling and reduce mechanical losses resulting in better dynamic performance and low-level details
  • Large motor system with 1” voice coil diameter and 80 mm magnet for better control and efficiency
  • Progressive suspension with optimized compromise between linearity and soft clipping
  • Suspension with CONEX damper (spider) for long durability under extreme operating conditions
  • Gold plated terminals to prevent oxidation for long-term reliable connection
  • Delivered with foam gasket attached to the frame for hassle-free mounting and secure enclosure sealing

FREQUENCY RESPONSE

WF118WA07_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

WF118WA07_impedance_resp
WF118WA08_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

WF118WA08_impedance_resp

NOMINAL SPECIFICATIONS

Notes

  Parameter

WF118WA07

WF118WA08

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

4

4

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

3

3

[kHz]

1, 4

Sensitivity, 2.83V/1m (average SPL in range 200 - 2,000 Hz)

87

84

[dB]

2, 4

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

 

 

[W]

2, 4

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

 

 

[W]

2

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

 

 

[W]

 

Effective radiating area, Sd

54

54

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

56

 

58

 

[Hz]

 

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

6.9

6.5

[g]

3, 4

Force factor, Bxl

4.5

5.8

[N/A]

3, 4, 6

Suspension compliance, Cms

1.18

 

1.18

 

[mm/N]

3, 4, 6

Equivalent air volume, Vas

4.9

 

4.9

 

[lit.]

3, 4, 6

Mechanical resistance, Rms

0.31

 

0.31

 

[Ns/m]

3, 4, 6

Mechanical Q, Qms

7.8

 

7.6

 

[-]

3, 4, 6

Electrical Q, Qes

0.38

 

0.45

 

[-]

3, 4, 6

Total Q, Qts

0.36

 

0.42

 

[-]

4

Voice coil resistance, RDC

3.2

6.4

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

0.22

0.36

[mH]

 

Voice coil inside diameter

26

26

[mm]

 

Voice coil winding height

12

12

[mm]

 

Air gap height

4

4

[mm]

 

Theoretical linear motor stroke, Xmax

4

4

[mm]

 

Magnet weight

 

 

[g]

 

Total unit net weight excl. packaging

 

 

[kg]

3, 4, 5

Krm

0.81

1.34

[mohm]

3, 4, 5

Erm

0.79

0.79

[-]

3, 4, 5

Kxm

3.6

5.5

[mH]

3, 4, 5

Exm

0.73

0.74

[-]

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 20 Hz sine wave for 2 hours at level 7.75/11 VRMS (4/8 ohm version). The units are not burned in before shipping.

OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)

WF118WA07/08 outline drawing
WF118WA07_08-outline-DWG

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

HARMONIC DISTORTION

WF118WA07-Harmonic-distortion

Measuring conditions
Driver mounting: Flush in infinite baffle, back side open (no cabinet)
Input voltage level for performing distortion measurements: 4.5 VRMS (WF118WA07),
6.3 VRMS (WF118WA08)
Smoothing: 1/6 oct.

WF118WA08-Harmonic-distortion

PACKAGING AND ORDERING INFORMATION

Part no. WF118WA07-01

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

Part no. WF118WA07-02

4 ohm version, bulk (industrial) packaging

Part no. WF118WA08-01

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

Part no. WF118WA08-02

8 ohm version, bulk (industrial) packaging

Latest update: February 19, 2016
 

 

Specifications are subject to change without any further notice.
Copyright © 2006-2016 by Wavecor Ltd., Guangzhou, China. All rights reserved.

 

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MORE INFO

WF182BD09/10/11/12 specificationsPDF data sheet
(651 KB)

 

 

 

Balanced Drive technical paperList of all mid/woofers

 

 

 

 

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