Bass Driver
  • New ergonomic, vented cast aluminium chassis offers improved thermal control
  • Power compression only 2.7db at rated power*
  • An effective transducer in a variety of versatile applications
  • Improved motor plating providing a more resilient finish and resistance to corrosion
  • Suitable for horn-loaded and reflex designs
Klippel Verifeid
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Designed specifically to provide powerful and accurate bass frequencies for sound reinforcement in a variety of enclosure types. The PD.1550/2’s improved linear excursion and efficient thermal path effectively dissipates heat minimising distortion and power compression effects.

The advanced magnetic assembly features a composite alloy and steel pole piece generating a uniform and stable magnetic field. The resulting high BL factor contributes to the speed, accuracy and fidelity of the PD.1550/2, maintaining control of the cone under the most demanding conditions.

General Specifications
Nominal Diameter15" / 380 mm
Voice Coil Diameter4.0" / 101.6 mm
Available Impedances4 Ω/ 8 Ω/ 16 Ω
Power Rating 1 2 *600 w (A.E.S.)
Peak Power (6dB Crest Factor)*2400 w (A.E.S.)
Sensitivity (1W – 1m)*99 dB
Frequency Range40 Hz - 1.5 kHz
Recommended Enclosure Volume80 - 200 Litres
Resonance46.17 Hz
Voice Coil Winding Depth22 mm / 0.87"
Magnet Gap Depth10 mm / 0.39"
Flux Density1.5 Tesla
Magnet MaterialCeramic
Magnet Weight
Voice Coil MaterialCopper
Former MaterialGlass Fibre
Dust Dome MaterialPaper
Suspension MaterialFabric
Cone MaterialPaper
Surround MaterialFabric
Thiele Small Parameters
Fs46.17 Hz
Re6.59 Ω
Le (@1 kHz)
Le (@10 kHz)0.78 mh
Vas126.39 litres
Mms114.38 g
Sd907.92 cm2
Cms109.33 µm/N
BL26.61 T/m
Xmax8.2 mm
Vd0.73 litres
Ref. Efficiency3.14%
EBP153.9 Hz


Dimensions & Mounting
Overall Diameter410 mm
Widths Across Flats395 mm
Flange Height10 mm
Depth (Excl. Flange)146 mm
Magnet Diameter220 mm
Chassis Shoulder Diameter357 mm
Outer Bolt Circle6 * M6 on 395mm PCD
Inner Bolt Circle8 * M6 on 370mm PCD


Shipping Information
Nett Weight12.8 Kg / 28.22 lb.
Shipping Weight14 Kg / 30.86 lb.
*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.

1. AES Standard (40 to 400 Hz) Program 1200 Watts.
2. AES Recommended Practice.
3. Thiele - Small Parameters follow a 1000 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.
Frequency Response & Impedance
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