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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
Klippel Verifeid


15" / 381 mm

Coil Diameter

4.0" / 101.6 mm

Power Rating

900 W (A.E.S.)

Frequency Range

45 Hz - 1 kHz


98.5 dB


8.2 mm

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.

£204.60 MRRP Ex. VAT

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Frequency Response Graph
Impedance GRAPH
General Specifications
Type Sub Bass Driver
Available Impedance 4 Ω/ 8 Ω/ 16 Ω
Nominal Diameter 15" / 381 mm
Voice Coil Diameter 4.0" / 101.6 mm
Peak Power (6 dB Crest Factor) * 3600 W (A.E.S.)
Power Rating 1 2 * 900 W (A.E.S.)
Sensitivity (1W/ 1m) * 98.5 dB
Frequency Range 45 Hz - 1 kHz
Resonance 45 Hz
Voice Coil Winding Depth 0.87" / 22.00 mm
Recommended Enclosure Volume 45 - 125 litres
Flux Density 1.39 Tesla
Magnet Material Ceramic
Magnet Gap Depth 10.00 mm / 0.39"
Former Material Glass Fibre
Dust Dome Material Paper
Voice Coil Material Copper Clad Aluminium
Cone Material Paper
Suspension Material Fabric
Surround Material Fabric
Thiele Small Parameters
Fs 45 Hz
Re 6.1 Ω
Qms 4.29
Qes 0.335
Qts 0.311
Le (@ 1 kHz) 1.800 mH
Vas 128 Litres
Mms 119.00 g
Sd 897.5 cm2
Cms 111.90 µm/N
BL 25.50 T/m
Xmax 8.2 mm
Vd 0.730 Litres
Ref. Efficiency 3.36%
EBP 134.33 Hz
Dimensions & Mounting
Overall Diameter 408.30 mm
Width Across Flats 395 mm
Flange Height 11.00 mm
Depth (Excl. Flange) 154.10 mm
Magnet Diameter 220 mm
Chassis Shoulder Diameter 356 mm
Outer Bolt Circle x6 M6 on 395 mm PCD
Inner Bolt Circle N/A
Shipping Information
Nett Weight 12.80 Kg / 28.22 lb
Shipping Weight 13.50 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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