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SW275BD01/02     10 die cast, composite cone subwoofers, 4/8 ohm

 

 

 

 

 

Wavecor Balanced Drive Technology

10" Ultra-High Performance Subwoofer Unit
When nothing but the most extreme in bass output and performance is required.
Very low distortion from below 20 Hz.

Specifications
Frequency resp.
Harmonic distortion
Dimensions
Ordering info

Downloads
SPL and impedance response curves as text files

SW275BD01_SPL_response

SW275BD01 SPL response

SW275BD01_impedance_response

SW275BD01 impedance response

SW275BD02_SPL_response

SW275BD02 SPL response

SW275BD02_impedance_response

SW275BD02 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

  • Extreme overhung voice coil with 16mm of linear stroke to ensure lowest distortion at very high drive levels
  • FEA optimized suspension for improved symmetry and lower distortion
  • Very large motor structure with 2” voice coil for better control and power handling
  • Balanced Drive motor for optimal drive force symmetry resulting in largely reduced even order harmonic distortion
  • Rigid Mica/Paper composite cone to ensure piston motion even at high levels - for reduced distortion
  • Dual-spider design for higher mechanical durability and high-excursion stability
  • Rigid die cast alu 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
  • 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

SW275BD01

SW275BD02

Unit

Before burn-in

After burn-in

Before burn-in

After burn-in

 

Nominal size

10

10

[inch.]

 

Nominal impedance

4

8

[ohm]

 

Recommended max. upper frequency limit

400

400

[Hz]

1, 4

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

85.5

82.5

[dB]

2, 4

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

 

 

[W]

2, 4

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

 

 

[W]

2

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

250

250

[W]

 

Effective radiating area, Sd

314

314

[sq.cm]

3, 4, 6

Resonance frequency (free air, no baffle), Fs

30.8

 

31.6

 

[Hz]

 

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

121

115

[g]

3, 4

Force factor, Bxl

12.1

15.2

[N/A]

3, 4, 6

Suspension compliance, Cms

0.22

 

0.22

 

[mm/N]

3, 4, 6

Equivalent air volume, Vas

31

 

31

 

[lit.]

3, 4, 6

Mechanical resistance, Rms

1.85

 

1.85

 

[Ns/m]

3, 4, 6

Mechanical Q, Qms

12.7

 

12.4

 

[-]

3, 4, 6

Electrical Q, Qes

0.59

 

0.70

 

[-]

3, 4, 6

Total Q, Qts

0.57

 

0.67

 

[-]

4

Voice coil resistance, RDC

3.7

7.1

[ohm]

5

Voice coil inductance, Le (measured at 1 kHz)

0.94

1.54

[mH]

 

Voice coil inside diameter

64

64

[mm]

 

Voice coil winding height

39

39

[mm]

 

Air gap height

7

7

[mm]

 

Theoretical linear motor stroke, Xmax

16

16

[mm]

 

Magnet weight

 

 

[g]

 

Total unit net weight excl. packaging

8

8

[kg]

3, 4, 5

Krm

16

51

[mohm]

3, 4, 5

Erm

0.52

0.44

[-]

3, 4, 5

Kxm

2.4

3.5

[mohm]

3, 4, 5

Exm

0.87

0.87

[-]

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 exciting 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

SW275BD01-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

SW275BD01-IMP
SW275BD02-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

SW275BD02-IMP

HARMONIC DISTORTION

SW275BD01-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, 11 VRMS (SW275BD01) / 15.5 VRMS (SW275BD02)
Smoothing: 1/6 oct.

SW275BD02-Harmonic-distortion

OUTLINE DRAWING AND NOMINAL DIMENSIONS

SW275BD01_02 outline drawing PDF
SW275BD01-dwg

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals

Thickness, both terminals: 0.8 mm
Terminal plating: Gold

PACKAGING AND ORDERING INFORMATION

Part no. SW275BD01-01

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

Part no. SW275BD02-01

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

Latest update: December 19, 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

SW275BD01_02 specificationsPDF data sheet
(802 KB)

 

Balanced Drive technical paperBalanced Drive technical paper
(2.34 MB)

 

Wavecor subwoofer drivers overviewWavecor subwoofer drivers overview

 

SW275BD01 cabinet simulationsCabinet simulations, SW275BD01
(292 KB)

 

SW275BD02 cabinet simulationsCabinet simulations, SW275BD02
(328 KB)

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