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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
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) * 3200 w (A.E.S.)
Power Rating 1 2 * 800 w (A.E.S.)
Sensitivity (1W/ 1m) * 98 dB
Frequency Range 35 Hz - 2 kHz
Resonance 33.15 Hz
Voice Coil Winding Depth 28 mm / 1.1"
Recommended Enclosure Volume 90 - 220 Litres
Flux Density 1.18 Tesla
Magnet Material Ceramic
Magnet Gap Depth 12 mm / 0.47"
Former Material Glass Fibre
Dust Dome Material Paper
Voice Coil Material Copper
Cone Material Paper
Suspension Material Fabric
Surround Material Fabric
Thiele Small Parameters
Fs 33.15 Hz
Re 5.22 Ω
Qms 15.42
Qes 0.24
Qts 0.24
Le (@ 1 kHz) 1.33 mh
Vas 203.84 litres
Mms 215.24 g
Sd 1164.16 cm2
Cms 107 µm/N
BL 30.99 T/m
Xmax 11.05 mm
Vd 1.28 litres
Ref. Efficiency 2.88%
EBP 138.12 Hz
Dimensions & Mounting
Overall Diameter 474 mm
Width Across Flats 459 mm
Flange Height 14.5 mm
Depth (Excl. Flange) 177.4 mm
Magnet Diameter 280 mm
Chassis Shoulder Diameter 415 mm
Outer Bolt Circle x6 M8 on 455 mm PCD
Inner Bolt Circle N/A
Shipping Information
Nett Weight 23 Kg / 50.70 lb.
Shipping Weight 26.3 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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