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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


18" / 457.2 mm

Coil Diameter

5.0" / 127 mm

Power Rating

700 w (A.E.S.)

Frequency Range

30 Hz - 2 kHz


95 dB


10.5 mm

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.

£241.09 MRRP Ex. VAT

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General Specifications
Type Sub Bass Driver
Available Impedance 4 Ω/ 8 Ω/ 16 Ω
Nominal Diameter 18" / 457.2 mm
Voice Coil Diameter 5.0" / 127 mm
Peak Power (6 dB Crest Factor) * 2800 w (A.E.S.)
Power Rating 1 2 * 700 w (A.E.S.)
Sensitivity (1W/ 1m) * 95 dB
Frequency Range 30 Hz - 2 kHz
Resonance 34.18 Hz
Voice Coil Winding Depth 25 mm / 0.98"
Recommended Enclosure Volume 100 - 350 Litres
Flux Density 0.95 Tesla
Magnet Material Ceramic
Magnet Gap Depth 9 mm / 0.35"
Former Material Glass Fibre
Dust Dome Material Paper
Voice Coil Material Copper
Cone Material Paper
Suspension Material Dual Fabric
Surround Material Fabric
Thiele Small Parameters
Fs 34.18 Hz
Re 6.19 Ω
Qms 10.77
Qes 0.55
Qts 0.52
Le (@ 1 kHz) 1.95 mh
Vas 192.15 litres
Mms 203.93 g
Sd 1134.11 cm2
Cms 106.67 µm/N
BL 22.18 T/m
Xmax 10.5 mm
Vd 1.2 litres
Ref. Efficiency 2.05%
EBP 62.14 Hz
Dimensions & Mounting
Overall Diameter 474 mm
Width Across Flats 459 mm
Flange Height 14.5 mm
Depth (Excl. Flange) 175 mm
Magnet Diameter 220 mm
Chassis Shoulder Diameter 415 mm
Outer Bolt Circle x6 M8 on 455 mm PCD
Inner Bolt Circle N/A
Shipping Information
Nett Weight 15.1 Kg / 33.28 lb.
Shipping Weight 16.5 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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