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WF275BD01/02     10 die cast, paper/fiber-cone mid/woofers 4/8 ohm

 

 

 

 

 

 

Frequency resp.
Parameters
Dimensions
Distortion
Ordering info

Wavecor Balanced Drive Technology

The 10.75” transducers WF275BD01 (4 ohm) and WF275BD02 (8 ohm) were designed as high performance bass/midrange units for monitors and high-end hi-fi speakers. They offer outstanding extended bass performance and overall dynamic and detailed reproduction.
Ideal for multi-way constructions they additionally offer designers the rare opportunity of working with 10” 2-way solutions if paired with a suitable tweeter, like for instance some of the Wavecor 30 mm units.

Download
SPL and impedance response curves as text files

WF275BD01 SPL response

WF275BD01 SPL response

WF275BD01 impedance response

WF275BD01 impedance response

WF275BD02 SPL response

WF275BD02 SPL response

WF275BD02 impedance response

WF275BD02 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 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 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

WF275BD01-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

WF275BD01-impedance-respons
WF275BD02-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

WF275BD02-impedance-respons

NOMINAL SPECIFICATIONS

Notes

  Parameter

WF275BD01

WF275BD02

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

10.75

10.75

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

1.5

1.5

[kHz]

1, 4

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

90

87

[dB]

2, 4

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

1,800

1,800

[W]

2, 4

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

450

450

[W]

2

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

180

180

[W]

 

Effective radiating area, Sd

312

312

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

27

 

28

 

[Hz]

 

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

57

54

[g]

3, 4

Force factor, Bxl

8.9

11.8

[N/A]

3, 4, 6

Suspension compliance, Cms

0.59

 

0.59

 

[mm/N]

3, 4, 6

Equivalent air volume, Vas

81.5

 

81.5

 

[lit.]

3, 4, 6

Mechanical resistance, Rms

0.85

 

0.85

 

[Ns/m]

3, 4, 6

Mechanical Q, Qms

11.6

 

11.3

 

[-]

3, 4, 6

Electrical Q, Qes

0.38

 

0.47

 

[-]

3, 4, 6

Total Q, Qts

0.37

 

0.45

 

[-]

4

Voice coil resistance, RDC

3.1

6.8

[ohm]

5

Voice coil inductance, Le (measured at 10 kHz)

0.14

0.23

[mH]

 

Voice coil inside diameter

39

39

[mm]

 

Voice coil winding height

23

23

[mm]

 

Air gap height

5

5

[mm]

 

Theoretical linear motor stroke, Xmax

+/-9

+/-9

[mm]

 

Magnet weight

 

 

[g]

 

Total unit net weight excl. packaging

 

 

[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)

WF275BD01/02 outline drawing
WF275BD01_02-DWG

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

HARMONIC DISTORTION

WF275BD01-harmonic-distortion

Measuring conditions, harmonic distortion
Driver mounting: In sealed, heavily stuffed enclosure, internal volume 25 lit.,
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 8.5 VRMS (WF275BD01), 12.0 VRMS (WF275BD02)
Smoothing: 1/12 oct.
 

WF275BD02-harmonic--distortion

PACKAGING AND ORDERING INFORMATION

Part no. WF275BD01-01

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

Part no. WF275BD02-01

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

Latest update: October 15, 2020

 

Specifications are subject to change without any further notice.
Copyright © 2006-2020 by Wavecor Ltd., Zhongshan, China. All rights reserved.

 

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MORE INFO

WF275BD01/02 specificationsPDF data sheet

 

Balanced Drive technical paperBalanced Drive technical paper (2.34 MB)

 

Balanced Drive technical paperList of all Wavecor mid/woofers

 

 

 

 

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