Sub Bass Driver
  • 4″ High temperature CCAW voice coil
  • Composite alloy and steel pole piece, producing a uniform and stable magnetic field
  • High BL driver in excess of 25 T/m
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Designed to faithfully reproduce powerful and accurate bass frequencies with minimal distortion and power compression. Suitable for sound reinforcement in a variety of enclosure designs.

Frequency Response GRaPH
Impedance GRAPH
General Specifications
Nominal Diameter15" / 381 mm
Voice Coil Diameter4.0" / 101.6 mm
Available Impedances4 Ω/ 8 Ω/ 16 Ω
Power Rating 1 2 *900 W (A.E.S.)
Peak Power (6dB Crest Factor)*3600 W (A.E.S.)
Sensitivity (1W – 1m)*98.5 dB
Frequency Range45 Hz - 1 kHz
Recommended Enclosure Volume45 - 125 litres
Resonance45 Hz
Voice Coil Winding Depth0.87" / 22.00 mm
Magnet Gap Depth10.00 mm / 0.39"
Flux Density1.39 Tesla
Magnet MaterialCeramic
Magnet Weight
Voice Coil MaterialCopper Clad Aluminium
Former MaterialGlass Fibre
Dust Dome MaterialPaper
Suspension MaterialFabric
Cone MaterialPaper
Surround MaterialFabric
Thiele Small Parameters
Fs45 Hz
Re6.1 Ω
Le (@1 kHz)
Le (@10 kHz)1.800 mH
Vas128 Litres
Mms119.00 g
Sd897.5 cm2
Cms111.90 µm/N
BL25.50 T/m
Xmax8.2 mm
Vd0.730 Litres
Ref. Efficiency3.36%
EBP134.33 Hz
Dimensions & Mounting
Overall Diameter15" / 381 mm
Widths Across Flats395 mm
Flange Height11.00 mm
Depth (Excl. Flange)154.10 mm
Magnet Diameter220 mm
Chassis Shoulder Diameter354.20 mm
Outer Bolt Circlex6 M6 on 394 mm PCD
Inner Bolt CircleN/A


Shipping Information
Nett Weight12.80 Kg / 28.22 lb
Shipping Weight13.50 Kg / 29.76 lb


* 2.83V. Half space response measured in a 950 litre sealed enclosure.

*1 Power compression is the reduction of sensitivity at the specified power. Higher power ratings do not necessarily give a proportionate increase in SPL therefore the maximum SPL of the driver may significantly exceed that of other manufacturers with high power ratings.

** Distortion is measured at 10% of the rated power (AES Standard).

1. AES Standard (45 to 450 Hz) Program 700 Watts.

2. AES Recommended Practice.

3. Thiele - Small Parameters follow a 700 Watt preconditioning period.

Please note that frequency response measurements are supplied for comparison purposes only and are not a measure of the low frequency performance which may be achievable in a fully optimised system.
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