Sub Bass Driver
  • New ergonomic, vented cast aluminium chassis offers improved thermal control
  • Double suspension system
  • 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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Providing outstanding high-power bass and sub bass in systems that demand the best possible low frequency response. The PD.186/3 is a popular choice for horn-loaded applications where it can deliver full low-end at high SPL with superior power compression performance thanks to the huge copper area and breathing arrangement of the voice coil. Ideal for three-way direct radiating systems where the powerful bass comes into its own.

The PD.186/3 is well suited for use with the PD.121/2 alongside PD 1” and 2” compression drivers where its double suspension system allows it to thrive.

General Specifications
Nominal Diameter18" / 457.2 mm
Voice Coil Diameter5.0" / 127 mm
Available Impedances4 Ω/ 8 Ω/ 16 Ω
Power Rating 1 2 *700 w (A.E.S.)
Peak Power (6dB Crest Factor)*2800 w (A.E.S.)
Sensitivity (1W – 1m)*95 dB
Frequency Range30 Hz - 2 kHz
Recommended Enclosure Volume100 - 350 Litres
Resonance34.18 Hz
Voice Coil Winding Depth25 mm / 0.98"
Magnet Gap Depth9 mm / 0.35"
Flux Density0.95 Tesla
Magnet MaterialCeramic
Magnet Weight-
Voice Coil MaterialCopper
Former MaterialGlass Fibre
Dust Dome MaterialPaper
Suspension MaterialDual Fabric
Cone MaterialPaper
Surround MaterialFabric
Thiele Small Parameters
Fs34.18 Hz
Re6.19 Ω
Le (@1 kHz)
Le (@10 kHz)1.95 mh
Vas192.15 litres
Mms203.93 g
Sd1134.11 cm2
Cms106.67 µm/N
BL22.18 T/m
Xmax10.5 mm
Vd1.2 litres
Ref. Efficiency2.05%
EBP62.14 Hz


Dimensions & Mounting
Overall Diameter474 mm
Widths Across Flats459 mm
Flange Height14.5 mm
Depth (Excl. Flange)173 mm
Magnet Diameter220 mm
Chassis Shoulder Diameter414.5 mm
Outer Bolt Circle6 * M8 on 455mm PCD
Inner Bolt CircleN/A


Shipping Information
Nett Weight15.1 Kg / 33.28 lb.
Shipping Weight16.5 Kg / 36.37 lb.
* 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 (40 to 400 Hz). Program 1400 Watts.
2. AES Recommended Practice.
3. Thiele - Small Parameters follow a 700 Watt preconditioning period verified by Klippel LSI measurement.
4. 2.83V. Half space response measured in a 975 Litre sealed enclosure.
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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