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SW178WA01    7" alu cone subwoofer, 8 ohm

 

 

 

 

SW178WA01 is a woofer designed for dedicated subwoofer applications. It works equally well for high-end hi-fi, high quality home theater systems, and top multimedia setups.
The extremely stiff aluminium cone, the long linear throw, exaggerated ventilation, and the special dynamic linearization short circuiting ring together makes up for an unusually linear and low-distortion woofer. Even at very high signal levels, the unit behaves controlled and without distortion.
Due to very low mechanical losses SW178WA01 masters equally well low level details and dynamic requirements.

FEATURES

SW178WA01-subwoofer-unit

Frequency resp.
Specifications
Dimensions
Ordering info

  • Very rigid aluminium cone to ensure piston motion at high levels and for better heat transfer at high continuous power levels
  • Vented voice coil former for reduced distortion and compression
  • Vented center pole with dual flares for reduced noise level at large cone excursions
  • Vented chassis for lower air flow speed reducing audible distortion
  • Heavy-duty black fiber glass voice coil bobbin to reduce mechanical losses resulting in better dynamic performance and low-level details
  • Large motor system with 1” voice coil diameter and 110mm magnet for better control and efficiency
  • Built-in alu field-stabilizing ring for reduced high-level distortion
  • Long linear stroke motor for reduced distortion at high levels
  • Linear suspension with specially designed CONEX damper (spider) for long durability under extreme operating conditions
  • 4-layer voice coil for increased control and better small-cabinet performance
  • Gold plated terminals to prevent oxidation for long-term reliable connection
  • Sealing gasket pre-attached for hassle-free mounting and secure cabinet sealing

FREQUENCY RESPONSE

SW178WA01-SPL-IMP

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

Before burn-in

After burn-in

Unit

 

 Nominal size

7

 [inch.]

 

 Nominal impedance

8

 [ohm]

 

 Recommended max. upper frequency limit

600

 [Hz]

1, 3

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

85

 [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

100

 [W]

 

 Effective radiating area, Sd

131

 [sq.cm]

3, 6

 Resonance frequency (free air, no baffle), Fs

38

36

 [Hz]

 

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

35

 [g]

3

 Force factor, Bxl

12.0

 [N/A]

3, 6

 Suspension compliance, Cms

0.50

0.56

 [mm/N]

3, 6

 Equivalent air volume, Vas

12.2

13.6

 [lit.]

3, 6

 Mechanical Q, Qms

19.3

18.4

 [-]

3, 6

 Electrical Q, Qes

0.37

0.35

 [-]

3, 6

 Total Q, Qts

0.365

0.346

 [-]

4

 Voice coil resistance, RDC

6.4

 [ohm]

5

 Voice coil inductance, Le (measured at 1 kHz)

2.2

 [mH]

 

 Voice coil inside diameter

39

 [mm]

 

 Voice coil winding height

16

 [mm]

 

 Air gap height

6

 [mm]

 

 Magnet weight

680

 [g]

 

 Total unit net weight excl. packaging

1.81

 [kg]

3, 5

 Krm

 

 [mohm]

3, 5

 Erm

 

 [-]

3, 5

 Kxm

 

 [mH]

3, 5

 Exm

 

 [-]

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 14.1 VRMS. The unit is not burned in before shipping.
 

OUTLINE DRAWING AND NOMINAL DIMENSIONS (mm)

SW178WA01 outline drawing
SW178WA01-outline-drawing4

TERMINAL NOMINAL DIMENSIONS (mm)

Terminals-dimensions

PACKAGING AND ORDERING INFORMATION

Part no. SW178WA01-01

Individual packaging (one piece per box)

Part no. SW178WA01-02

Bulk packaging

Latest update: Jul. 5, 2012

 

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

SW178WA01 specificationsPDF data sheet
(0.99 MB)

pdf_iconCross section/ exploded view
(300KB)

EDrawings-icon3D model, eDrawing
(1.6MB .htm file)

High resolution photo
(320KB JPEG)

7” passive radiator

Sealed box simulations SW178WA01Sealed box simulations
(205 KB)

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