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SW223BD02/03     8 die cast, alu cone subwoofers, 4/8 ohm

 

 

 

 

 

Wavecor Balanced Drive Technology

The 8” transducers SW223BD02 (4 ohm) and SW223BD03 (8 ohm) were designed specifically for high performance compact subwoofer applications where sound quality and low distortion are the priorities.

Frequency resp.
Specifications
Harm. distortion
Dimensions
Ordering info

FEATURES

SW223BD02_03
  • Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
  • Extremely large linear stroke, Xmax = 10.7 mm, ensuring low distortion at high output levels
  • Very rigid black aluminium cone to ensure piston motion at high levels and for better heat transfer at high continuous power levels
  • Rigid die cast alu chassis with extensive venting for lower air flow speed reducing audible distortion
  • Heavy-duty black fiber glass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
  • Large motor with 2” 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 cone and 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

SW223BD02-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

SW223BD02-impedance
SW223BD03-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

SW223BD03-impedance

NOMINAL SPECIFICATIONS

Notes

  Parameter

SW223BD02

SW223BD03

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

1,000

1,000

[Hz]

1, 3

Sensitivity, 2.83V/1m

83

81

[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

200

200

[W]

 

Effective radiating area, Sd

206

206

[sq.cm]

3, 6

Resonance frequency (free air, no baffle), Fs

24

 

25

 

[Hz]

 

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

97

89

[g]

3

Force factor, Bxl

11.0

13.1

[N/A]

3, 6

Suspension compliance, Cms

0.47

 

0.47

 

[mm/N]

3, 6

Equivalent air volume, Vas

28

 

28

 

[lit.]

3, 6

Mechanical resistance, Rms

1.35

 

1.35

 

[Ns/m]

3, 6

Mechanical Q, Qms

10.7

 

10.2

 

[-]

3, 6

Electrical Q, Qes

0.42

 

0.48

 

[-]

3, 6

Total Q, Qts

0.40

 

0.46

 

[-]

4

Voice coil resistance, RDC

3.5

6.0

[ohm]

5

Voice coil inductance, Le (measured at 1 kHz)

0.80

1.16

[mH]

 

Voice coil inside diameter

51

51

[mm]

 

Voice coil winding height

29.4

29.4

[mm]

 

Air gap height

6

6

[mm]

 

Theoretical linear motor stroke, Xmax

11.7

11.7

[mm]

 

Magnet weight

 

 

[g]

 

Total unit net weight excl. packaging

4.4

4.4

[kg]

3, 5

Krm

84

88

[mohm]

3, 5

Erm

0.37

0.40

[-]

3, 5

Kxm

20

36

[mH]

3, 5

Exm

0.57

0.54

[-]

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.
 

HARMONIC DISTORTION

SW223BD02-harmonic-distortion

Measuring conditions, harmonic distortion
Driver mounting: In sealed, heavily stuffed enclosure, internal volume 28 lit.,
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 8.95 VRMS (SW223BD02) / 12.65 VRMS (SW223BD03)
Smoothing: 1/12 oct.

SW223BD03-harmonic-distortion

OUTLINE DRAWING AND NOMINAL DIMENSIONS

SW223BD02/03 outline drawing PDF
SW223BD02_03--outline-drawi

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

PACKAGING AND ORDERING INFORMATION

Part no. SW223BD02-01

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

Part no. SW223BD03-01

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

Latest update: March 13, 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

PDF data sheet
(685 KB)

 

Balanced Drive technical paperBalanced Drive technical paper
(2.34 MB)

 

SW223BD02 enclosure simulationsSW223BD02
(4 ohm) enclosure simulations

 

SW223BD03 enclosure simulationsSW223BD03
(8 ohm) enclosure simulations

 

PR223WA02 passive radiator

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