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Sub Bass Driver
  • Heavy-duty cast aluminium chassis for increased rigidity
  • Power compression only 1.6dB at rated power
  • A B/L in excess of 30 T/m
  • Double suspension
  • Appropriate for applications as diverse as scoop bins, conventional reflex cabinets and horn loaded systems
Klippel Verifeid


18" / 457.2 mm

Coil Diameter

5.0" / 127 mm

Power Rating

800 w (A.E.S.)

Frequency Range

35 Hz - 2 kHz


98 dB


11.05 mm

Designed specifically to provide powerful and accurate bass frequencies with minimal distortion and power compression. The PD.1850/3 is the optimum choice for top of the range sub bass systems. Suitable for sound reinforcement in a variety of enclosure types such as scoop bins, conventional reflex cabinets and horn loaded systems.

£377.66 MRRP Ex. VAT

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General Specifications
TypeSub Bass Driver
Nominal Diameter18" / 457.2 mm
Voice Coil Diameter5.0" / 127 mm
Power Rating 1 2 *800 w (A.E.S.)
Available Impedance4 Ω/ 8 Ω/ 16 Ω
Sensitivity (1W/ 1m)*98 dB
Frequency Range35 Hz - 2 kHz
Peak Power (6 dB Crest Factor)3200 w (A.E.S.)
Resonance33.15 Hz
Voice Coil Winding Depth28 mm / 1.1"
Recommended Enclosure Volume90 - 220 Litres
Flux Density1.18 Tesla
Magnet MaterialCeramic
Magnet Gap Depth12 mm / 0.47"
Former MaterialGlass Fibre
Dust Dome MaterialPaper
Voice Coil MaterialCopper
Cone MaterialPaper
Suspension MaterialFabric
Surround MaterialFabric
Thiele Small Parameters
Fs33.15 Hz
Re5.22 Ω
Le (@ 1 kHz)1.33 mh
Vas203.84 litres
Mms215.24 g
Sd1164.16 cm2
Cms107 µm/N
BL30.99 T/m
Xmax11.05 mm
Vd1.28 litres
Ref. Efficiency2.88%
EBP138.12 Hz
Dimensions & Mounting
Overall Diameter474 mm
Width Across Flats459 mm
Flange Height14.5 mm
Depth (Excl. Flange)177.4 mm
Magnet Diameter280 mm
Chassis Shoulder Diameter415 mm
Outer Bolt Circlex6 M8 on 455 mm PCD
Inner Bolt CircleN/A
Shipping Information
Nett Weight23 Kg / 50.70 lb.
Shipping Weight26.3 Kg / 57.98 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 (35 to 350 Hz). Program 1600 Watts.
2. AES Recommended Practice.
3. Thiele - Small Parameters follow a 800 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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