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Wavecor
WF211PA01/02   8" die cast frame, paper cone PA mid/woofers, 4/8 ohm

 

 

 

 

 

Specifications
Frequency resp
Dimensions
Distortion
Ordering info

Wavecor Balanced Drive Technology

The 8.25” transducers WF211PA01 4 ohm) and WF211PA02 (8 ohm) were designed dedicated for Public Address audio systems.
They merge the well-known audiophile sound qualities of a typical Wavecor transducer with the common virtues of PA transducers with high sensitivity, high power handling, low distortion, and true-to-the-source sound reproduction.

Downloads
SPL and impedance response curves as text files

WF211PA01 SPL response

WF211PA01 SPL response

WF211PA01 impedance response

WF211PA01 impedance response

WF211PA02 SPL response

WF211PA02 SPL response

WF211PA02 impedance response

WF211PA02 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

  • Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
  • Alu shorting ring on center pole below and above air gap to reduce voice coil induction, reduce variation of voice coil induction as a function of voice coil position, and reduce flux variation induced by voice coil current. All with the purpose of reducing large-signal distortion
  • Large motor with 2.5” voice coil diameter for better control and power handling
  • Cone made of light and stiff paper formula for high efficiency and uncoloured sound
  • 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 and compression 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
  • Low-loss suspension (high Qm) for better reproduction of details and dynamics
  • Black plated motor parts for better heat transfer to the surrounding air
  • Conex spider for better long-term stability and better durability under extreme conditions

NOMINAL SPECIFICATIONS

Notes

  Parameter

WF211PA01

WF211PA02

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

8.25

8.25

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

3

3

[kHz]

1, 4

Sensitivity, 2.83V/1m (calculated from T/S parameters)

96.5

93

[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

200

200

[W]

2

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

170

170

[W]

 

Effective radiating area, Sd

214

214

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

68

59

68

59

[Hz]

 

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

26

25.8

[g]

3, 4

Force factor, Bxl

10.7

13.4

[N/A]

3, 4, 6

Suspension compliance, Cms

0.21

0.28

0.21

0.28

[mm/N]

3, 4, 6

Equivalent air volume, Vas

13.6

18.2

13.6

18.2

[lit.]

3, 4, 6

Mechanical resistance, Rms

1.68

1.68

1.68

1.68

[Ns/m]

3, 4, 6

Mechanical Q, Qms

6.7

5.8

6.6

5.7

[-]

3, 4, 6

Electrical Q, Qes

0.30

0.26

0.38

0.33

[-]

3, 4, 6

Total Q, Qts

0.29

0.25

0.36

0.31

[-]

4

Voice coil resistance, RDC

3.1

6.1

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

 

 

[mH]

 

Voice coil inside diameter

64

64

[mm]

 

Voice coil winding height

10

10

[mm]

 

Air gap height

6

6

[mm]

 

Theoretical linear motor stroke, Xmax

+/-2

+/2

[mm]

 

Magnet weight

1.85

1.85

[kg]

 

Total unit net weight excl. packaging

5.0

5.0

[kg]

3, 4, 5

Krm

 

 

[mohm]

3, 4, 5

Erm

 

 

[-]

3, 4, 5

Kxm

 

 

[mohm]

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 12 hours after exiting the transducer by a 20 Hz sine wave for 2 hours at level 16/24 VRMS (4/8 ohm version). The unit is not burned in before shipping.

FREQUENCY RESPONSE

WF211PA01 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

WF211PA01 impedance
WF211PA02 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

WF211PA02 impedance

HARMONIC DISTORTION

WF211PA01 harmonic distortion

Measuring conditions, harmonic distortion
Driver mounting: In sealed enclosure, internal volume 10 lit.,
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 8.3 VRMS
Smoothing: 1/12 oct.
 

WF211PA02 harmonic distortion

Measuring conditions, harmonic distortion
Driver mounting: In sealed enclosure, internal volume 10 lit.,
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 10.7 VRMS
Smoothing: 1/12 oct.
 

OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)

WF211PA01/02 outline drawing
WF211PA01/02 outline drawing

TERMINAL NOMINAL DIMENSIONS (mm)

WF211PA01/02 Ierminals

Terminal thickness: 0.5 mm
Terminal plating: Gold

PACKAGING AND ORDERING INFORMATION

Part no. WF211PA01

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

Part no. WF211PA02

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

Latest update: June 26, 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

WF211PA01/02 specificationsPDF data sheet

 

Balanced Drive technical paperBalanced Drive technical paper

 

 

 

 

 

 

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