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WF118OM01/02,     4" paper cone mid/woofer, 4/8 ohm

 

 

 

 

WF118OM01 (4 ohm) and WF118OM02 (8 ohm) are 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.

Frequency resp.
Specifications
Dimensions
Ordering info

FEATURES

WF118OM01/02
  • FEA optimized suspension for perfect symmetry, reducing even order harmonic distortion
  • Balanced Drive motor with perfect force factor symmetry for reduced distortion
  • 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
  • Progressive suspension with optimized compromise between linearity and soft clipping
  • New damper (spider) woven of a mix of polymers and natural fibers for improved durability
  • 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

WF118OM01-freq.-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

WF118OM01-impedance
WF118OM02-freq.-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

WF118OM02-impedance

NOMINAL SPECIFICATIONS

Notes

  Parameter

WF118OM01

WF118OM02

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

4

4

[kHz]

1, 3

Sensitivity, 2.83V/1m (average 300-4,000Hz)

88

84.5

[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

25 (40)

25 (40)

[W]

 

Effective radiating area, Sd

54

54

[sq.cm]

3, 6

Resonance frequency (free air, no baffle), Fs

59

 

61

 

[Hz]

 

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

5.4

5.1

[g]

3

Force factor, Bxl

3.4

4.2

[N/A]

3, 6

Suspension compliance, Cms

1.33

 

1.33

 

[mm/N]

3, 6

Equivalent air volume, Vas

5.5

 

5.5

 

[lit.]

3, 6

Mechanical resistance, Rms

0.21

 

0.21

 

[Ns/m]

3, 6

Mechanical Q, Qms

9.6

 

9.3

 

[-]

3, 6

Electrical Q, Qes

0.56

 

0.70

 

[-]

3, 6

Total Q, Qts

0.53

 

0.65

 

[-]

4

Voice coil resistance, RDC

3.2

6.3

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

0.19

0.28

[mH]

 

Voice coil inside diameter

26

26

[mm]

 

Voice coil winding height

6.8

6.8

[mm]

 

Air gap height

3

3

[mm]

 

Theoretical linear motor stroke, Xmax

1.9

1.9

[mm]

 

Magnet weight

 

 

[g]

 

Total unit net weight excl. packaging

 

 

[kg]

3, 5

Krm

0.093

0.175

[mohm]

3, 5

Erm

1.00

0.98

[-]

3, 5

Kxm

5.9

10.8

[mH]

3, 5

Exm

0.64

0.63

[-]

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

WF118OM01/02 outline drawing PDF
WF118OM01-02_outline_drawing

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

PACKAGING AND ORDERING INFORMATION

Part no. WF118OM01-01

4 ohm version, bulk packaging

Part no. WF118OM02-01

8 ohm version, bulk packaging

Latest update: November 11, 2015

 

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

 

Wavecor Balanced Drive Technology
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MORE INFO

PDF data sheet
(630 KB)

 

Balanced Drive technical paperBalanced Drive technical paper
(2.34 MB)

 

 

 

 

 

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