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Thumbnail Filmstrip of Wavecor Subwoofer SW178WA01 8 Ohm 7 Inch Images
Wavecor Speaker Driver - SW178WA01 - 8 Ohm 7" Alu-Cone Subwoofer
Description
The SW178WA01 is a woofer designed for dedicated subwoofer applications. It works equally well for high-end hi-fi, high quality home theatre systems, and top multimedia setups. The extremely stiff aluminium cone, the long linear throw, exaggerated ventilation, and the special dynamic linearisation 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
- 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 centre 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 fibre glass voice coil bobbin to reduce mechanical losses resulting in better dynamic performance and low-level details
- Large motor system with 1½" voice coil diameter and 110mm magnet for better control and efficiency
- Built-in alu field-stabilising 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 SPL and Impedance Response Graphs
Loudspeaker Frequency Response Graph
Measuring conditions for SPL
Driver mounting: Flush in infinite baffle
Microphone distance: 1.0 m
Input level: 2.83 VRMS
Smoothing: 1/6 oct.
Technical Specifications
| Notes | Parameter | Value | Unit | |
Before |
After Burn-in |
|||
| Nominal size | 7 | inch | ||
| Nominal impedance | 8 | Ohm | ||
| Recommended max. upper frequency limit |
600 | kHz | ||
| 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 | cm2 | ||
| 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 | - | |
| 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.
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.
Driver Nominal Dimensions
Loudspeaker Driver Dimensions and Measurements - all dimensions in mm (approx.)
Terminal Nominal Dimensions
Loudspeaker Driver Terminal Dimensions and Measurements - all dimensions in mm (approx.)
Thickness, both terminals: 0.5 mm
Terminal plating: Gold