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SW215WA01/02     8 paper cone subwoofer, 4/8 ohm

 

 

 

 

 

Wavecor Balanced Drive Technology

8” High Performance Steel Frame Subwoofer Unit.
Suitable for dedicated subwoofer applications  and as low frequency transducer in 2-, 3- and multi-way speaker systems.

Specifications
Frequency resp.
Harm. distortion
Dimensions
Ordering info

FEATURES

SW215WA01_subwoofer
  • Balanced Drive motor structure for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
  • Large linear stroke, ensuring low distortion at high output levels
  • Rigid air-dried paper cone to ensure piston motion even at high levels - for reduced distortion
  • Rigid steel chassis with extensive venting for lower air flow speed reducing audible distortion
  • Vented center pole with dual flares for reduced noise level at large cone excursions
  • Heavy-duty fiber glass voice coil former to reduce mechanical losses resulting in better dynamic performance and low-level details
  • Large motor structure 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
  • Delivered with foam gasket attached for hassle-free mounting and secure cabinet sealing

NOMINAL SPECIFICATIONS

Notes

  Parameter

SW215WA01

SW215WA02

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

500

500

[Hz]

1, 4

Sensitivity, 2.83V/1m (calculated from T/S parameters)

88.5

86

[dB]

2, 4

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

1,500

1,500

[W]

2, 4

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

400

400

[W]

2

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

150

150

[W]

 

Effective radiating area, Sd

206

206

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

33

30

35

 

[Hz]

 

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

53

49

[g]

3, 4

Force factor, Bxl

8.45

11.4

[N/A]

3, 4, 6

Suspension compliance, Cms

0.43

0.54

0.43

 

[mm/N]

3, 4, 6

Equivalent air volume, Vas

26

32.5

26

 

[lit.]

3, 4, 6

Mechanical resistance, Rms

1.0

1.0

1.0

 

[Ns/m]

3, 4, 6

Mechanical Q, Qms

11

10

10.7

 

[-]

3, 4, 6

Electrical Q, Qes

0.51

0.46

0.52

 

[-]

3, 4, 6

Total Q, Qts

0.49

0.44

0.49

 

[-]

4

Voice coil resistance, RDC

3.3

6.3

[ohm]

5

Voice coil inductance, Le (measured at 1 kHz)

1.2

1.7

[mH]

 

Voice coil inside diameter

39

39

[mm]

 

Voice coil winding height

25

25

[mm]

 

Air gap height

5

5

[mm]

 

Theoretical linear motor stroke, Xmax

10

10

[mm]

 

Magnet weight

 

 

[g]

 

Total unit net weight excl. packaging

2.4

2.4

[kg]

3, 4, 5

Krm

7.0

1.04

[mohm]

3, 4, 5

Erm

0.68

0.94

[-]

3, 4, 5

Kxm

6.9

15.1

[mH]

3, 4, 5

Exm

0.78

0.74

[-]

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 VRMS (4/8 ohm version). The unit is not burned in before shipping.

FREQUENCY RESPONSE

SW215WA01-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

SW215WA01-IMP
SW215WA02-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

SW215WA02-IMP

HARMONIC DISTORTION

SW215WA01-Harmonic-Distortion

Measuring conditions, harmonic distortion
Driver mounting: In sealed, heavily stuffed enclosure, internal volume 29 lit.,
                           baffle dimensions 336 mm x 336 mm
Microphone distance: 0.5 m
Input signal: Stepped sine wave, 7.7 VRMS (SW215WA01) / 11 VRMS (SW215WA02)
Smoothing: 1/6 oct.

SW215WA02-Harmonic-Distortion

OUTLINE DRAWING AND NOMINAL DIMENSIONS

SW215WA01_02 outline drawing PDF
SW215WA01_02-outline-drawing

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

PACKAGING AND ORDERING INFORMATION

Part no. SW215WA01-01

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

Part no. SW215WA02-01

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

Latest update: Jul. 5, 2016

 

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
(1.28 MB)

 

Balanced Drive technical paperBalanced Drive technical paper
(2.34 MB)

 

 

 

 

 

 

SW215WA01 cabinet simulationsCabinet simulations, SW215WA01
(267 KB)

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