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SW182BD01/02     7 die cast, alu-cone subwoofers, 4/8 ohm

 

 

 

 

Frequency resp.
Specifications
Dimensions
Ordering info

Wavecor Balanced Drive Technology

The 7” transducers SW182BD01 (4 ohm) and SW182BD02 (8 ohm) were designed specifically for high performance compact subwoofer applications where sound quality and low distortion are the priorities.

 Update note Nov. 2015
It is suggested to consider using alternative models SW182BD03 and SW182BD04 for new designs.

Wavecor SW182BD01_02 subwoofer

SW182BD03 / SW182BD04 offer optimized suspension, reduced moving mass and lower voice coil inductance, which for some applications will be advantageous.

FEATURES

  • Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
  • Extremely large linear stroke, Xmax = 8 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
  • Vented voice coil former for reduced distortion and compression
  • Vented center pole with dual flares for reduced noise level 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 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

SW182BD01_02-SPL-&-IMP-resp

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

NOMINAL SPECIFICATIONS

Notes

  Parameter

SW182BD01

SW182BD02

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

7

7

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

500

500

[Hz]

1, 3

Sensitivity, 2.83V/1m (calculated from TSP using Zmin)

82.5

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

125

125

[W]

 

Effective radiating area, Sd

131

131

[sq.cm]

3, 6

Resonance frequency (free air, no baffle), Fs

31

26.5

33

30

[Hz]

 

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

49

43

[g]

3

Force factor, Bxl

8.5

11.5

[N/A]

3, 6

Suspension compliance, Cms

0.54

0.74

0.54

0.74

[mm/N]

3, 6

Equivalent air volume, Vas

13

18

13

18

[lit.]

3, 6

Mechanical resistance, Rms

0.53

1.1

0.53

1.1

[Ns/m]

3, 6

Mechanical Q, Qms

17.5

8.5

16.5

8

[-]

3, 6

Electrical Q, Qes

0.42

0.36

0.43

0.37

[-]

3, 6

Total Q, Qts

0.41

0.35

0.42

0.36

[-]

4

Voice coil resistance, RDC

3.2

6.4

[ohm]

5

Voice coil inductance, Le (measured at 1 kHz)

1.5

2.5

[mH]

 

Voice coil inside diameter

39

39

[mm]

 

Voice coil winding height

21

21

[mm]

 

Air gap height

5

5

[mm]

 

Magnet weight

640

640

[g]

 

Total unit net weight excl. packaging

1.85

1.85

[kg]

3, 5

Krm

6.4

5.4

[mohm]

3, 5

Erm

0.74

0.80

[-]

3, 5

Kxm

13.6

20

[mH]

3, 5

Exm

0.72

0.73

[-]

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)

SW182BD01/02 outline drawing
SW182BD01_2-outline-drawing

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

PACKAGING AND ORDERING INFORMATION

Part no. SW182BD01-01

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

Part no. SW182BD01-02

4 ohm version, bulk packaging

Part no. SW182BD02-01

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

Part no. SW182BD02-02

8 ohm version, bulk packaging

Latest update: November 9, 2015

 

Specifications are subject to change without any further notice.
Copyright © 2006-2015 by Wavecor Ltd., Guangzhou, China. All rights reserved.

 

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MORE INFO

SW182BD01/02 specificationsPDF data sheet
(2.01 MB)

 

Balanced Drive technical paperBalanced Drive technical paper
(2.34 MB)

 

SW182BD01 in Voice Coil magazine

 

Specs and measurements in electronic file formats

 

7” passive BD radiator

 

Sealed box simulations SW182BD01Sealed box simulations, SW182BD01 (329 KB)

 

Sealed box simulations SW182BD02Sealed box simulations, SW182BD02 (328 KB)

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