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SW182BD03/04     7 die cast, alu-cone subwoofers, 4/8 ohm

 

 

 

 

 

Frequency resp.
Specifications
Dimensions
Decay spectrum
Ordering info

Wavecor Balanced Drive Technology

The 7” transducers SW182BD03 (4 ohm) and SW182BD04 (8 ohm) were designed specifically for high performance compact subwoofer applications where sound quality and low distortion are the priorities.
The pair was developed as an alternative to the previous designs SW182BD01 and SW182BD02 as a preferred choice in many typical applications because of optimized suspension, lower moving mass, and lower voice coil induction.

SW182BD03_04-300px

Download
SPL and impedance response curves as text files

SW182BD03_SPL_response

SW182BD03 SPL response

SW182BD03_impedance_response

SW182BD03 impedance response

SW182BD04_SPL_response

SW182BD04 SPL response

SW182BD04_impedance_response

SW182BD04 mpedance 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
  • Extremely large linear stroke, Xmax = 7 mm, ensuring low distortion at high output levels
  • Optimized suspension for improved symmetry and matching of Force(x) curve
  • 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

SW182BD03-FR

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

SW182BD03-IMP
SW182BD04-FR

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

SW182BD04-IMP

NOMINAL SPECIFICATIONS

Notes

  Parameter

SW182BD03

SW182BD04

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

600

600

[Hz]

1, 4

Sensitivity, 2.83V/1m (average SPL in range 100 - 300 Hz)

84

81.5

[dB]

2, 4

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

1,100

1,100

[W]

2, 4

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

250

250

[W]

2

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

125

125

[W]

 

Effective radiating area, Sd

131

131

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

35.1

 

37.2

 

[Hz]

 

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

39.5

35.2

[g]

3, 4

Force factor, Bxl

7.6

10.2

[N/A]

3, 4, 6

Suspension compliance, Cms

0.52

 

0.52

 

[mm/N]

3, 4, 6

Equivalent air volume, Vas

12.7

 

12.7

 

[lit.]

3, 4, 6

Mechanical resistance, Rms

0.66

 

0.66

 

[Ns/m]

3, 4, 6

Mechanical Q, Qms

13.3

 

12.6

 

[-]

3, 4, 6

Electrical Q, Qes

0.45

 

0.51

 

[-]

3, 4, 6

Total Q, Qts

0.44

 

0.49

 

[-]

4

Voice coil resistance, RDC

3.0

6.4

[ohm]

5

Voice coil inductance, Le (measured at 1 kHz)

1.0

1.7

[mH]

 

Voice coil inside diameter

39

39

[mm]

 

Voice coil winding height

19

19

[mm]

 

Air gap height

5

5

[mm]

 

Theoretical linear motor stroke, Xmax

7

7

[mm]

 

Magnet weight

640

640

[g]

 

Total unit net weight excl. packaging

1.85

1.85

[kg]

3, 4, 5

Krm

2.65

3.9

[mohm]

3, 4, 5

Erm

0.76

0.77

[-]

3, 4, 5

Kxm

7.0

10.9

[mH]

3, 4, 5

Exm

0.76

0.77

[-]

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)

SW182BD03/04 outline drawing
SW182BD03-04_outline__dwg

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

CUMULATIVE DECAY SPECTRUM

SW182BD03-CDS-Aug-19-2015

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.

SW182BD04-CDS-Aug-19-2015

PACKAGING AND ORDERING INFORMATION

Part no. SW182BD03-01

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

Part no. SW182BD03-02

4 ohm version, bulk (industrial) packaging

Part no. SW182BD04-01

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

Part no. SW182BD04-02

8 ohm version, bulk (industrial) packaging

Latest update: November 11, 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

SW182BD03/04 specificationsPDF data sheet
(2.51 MB)

 

Balanced Drive technical paperBalanced Drive
technical paper

(2.34 MB)

 

Matching 7” passive radiator PR182BD02

 

Wavecor subwoofer transducersList of all subwoofers

 

SW182BD03 cabinet simulationsCabinet simulations SW182BD03
(298 KB)

 

SW182BD04 cabinet simulationsCabinet simulations SW182BD04
(290 KB)

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