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WF223BD01/02     8 die cast, paper/glass fibre cone mid/woofers

 

 

 

 

 

 

Frequency resp.
Specifications
Dimensions
Distortion
Decay spectrum
Ordering info

Wavecor Balanced Drive Technology

The 8” transducers WF223BD01 (4 ohm) and WF223BD02 (8 ohm) were designed as high performance bass/midrange units for  monitors and high-end hi-fi speakers. They offer outstanding deep bass performance and dynamic and detailed midrange.
Ideal for 3-way constructions they additionally offer designers the rare opportunity of working with 8” 2-way solutions if paired with a suitable tweeter like for instance some of the Wavecor 30 mm units.

WF223BD01_02_300pxs

Download
SPL and impedance response curves as text files

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WF223BD01 SPL response

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WF223BD01 impedance response

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WF223BD02 SPL response

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WF223BD02 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
  • 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
  • Cone made of a new paper/glass fiber mix with improved consistency and stability
  • 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 compressions 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 1” 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 plated 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

WF223BD01-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

WF223BD01-imp-response
WF223BD02-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

WF223BD02-imp-response

NOMINAL SPECIFICATIONS

Notes

  Parameter

WF223BD01

WF223BD02

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

8

8

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

2

2

[kHz]

1, 4

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

89.5

86.5

[dB]

2, 4

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

1,200

1,200

[W]

2, 4

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

300

300

[W]

2

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

150

150

[W]

 

Effective radiating area, Sd

213

213

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

32.6

 

33.1

 

[Hz]

 

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

34

33

[g]

3, 4

Force factor, Bxl

7.7

9.5

[N/A]

3, 4, 6

Suspension compliance, Cms

0.70

 

0.70

 

[mm/N]

3, 4, 6

Equivalent air volume, Vas

45

 

45

 

[lit.]

3, 4, 6

Mechanical resistance, Rms

0.48

 

0.48

 

[Ns/m]

3, 4, 6

Mechanical Q, Qms

14.5

 

14.3

 

[-]

3, 4, 6

Electrical Q, Qes

0.40

 

0.47

 

[-]

3, 4, 6

Total Q, Qts

0.39

 

0.46

 

[-]

4

Voice coil resistance, RDC

3.4

6.2

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

0.13

0.20

[mH]

 

Voice coil inside diameter

39

39

[mm]

 

Voice coil winding height

18

18

[mm]

 

Air gap height

5

5

[mm]

 

Theoretical linear motor stroke, Xmax

6.5

6.5

[mm]

 

Magnet weight

 

 

[g]

 

Total unit net weight excl. packaging

2.5

2.5

[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 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)

WF223BD01/02 outline drawing
WF223BD01_02 outline drawing

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

HARMONIC DISTORTION

WF223BD01-harmonic-distortion

Measuring conditions
Driver mounting: Flush in infinite baffle, back side open (no cabinet)
SPL level for performing distortion measurements: 94 dB / 1m
Smoothing, SPL curve: 1/6 oct.
Smoothing, distortion curves: 1/12 oct.
 

WF223BD02-harmonic-distortion

CUMULATIVE DECAY SPECTRUM

WF223BD01-CDS

Measuring conditions
Driver mounting: Flush in infinite baffle, back side open (no cabinet)
Smoothing: 1/6 oct.
Frequency domain converted to time domain (impulse response) by inverse FFT. 4 and 8 ohm versions normalized to same level for direct comparison of the decay plots.

WF223BD02-CDS

PACKAGING AND ORDERING INFORMATION

Part no. WF223BD01-01

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

Part no. WF223BD02-01

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

Latest update: April 19, 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

WF182BD09/10/11/12 specificationsPDF data sheet

 

Balanced Drive technical paperBalanced Drive technical paper (2.34 MB)

 

Balanced Drive technical paperList of all mid/woofers

 

 

 

 

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