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Sub Bass Driver
  • Vented cast aluminium chassis for improved thermal control of voice coil
  • Vented motor structure for improved control of power compression
  • 50 mm peak to peak travel
  • 31 T/m BL
  • Dual suspension assembly
  • Inside/ outside voice coil windings
  • Works well in conventional reflex designs and horn loading applications
Klippel Verifeid
Radial Neo Technology


18" / 457.2 mm

Coil Diameter

5.0" / 127 mm

Power Rating

1500 W (A.E.S.)

Frequency Range

30 Hz - 500 Hz


99 dB


11 mm

The PD.185C003 is ideally suited to applications where high power handling, long excursion and perfect linearity is required. Ideal for bass reflex and horn loaded enclosure systems where a high punch and low sub is required. The robust mechanical design and construction makes this unit an ideal choice for high power high SPL bass applications.

The PD.185C003 has been designed as combination of our PD.1850 and PD.1851 drivers. Its primary advantage over the two is that the total X mesh has been increased to 50 mm peak-to-peak travel above the standard 36 mm for the 1850 and 1851. This allows the PD.185C03 to be more user-friendly, rendering cabinet chamber sizes less critical for providing cabinet assistance to the drivers loading. Furthermore it provides additional protection to the drivers voice coil during transient signals at the low end of the frequency spectrum. PD.1851 and PD.1852 drivers also possess this protection but offer a different sound character owing to their surround geometry and compliance.

£330.00 MRRP Ex. VAT

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Frequency Response Graph
Impedance GRAPH
General Specifications
TypeSub Bass Driver
Nominal Diameter18" / 457.2 mm
Voice Coil Diameter5.0" / 127 mm
Power Rating 1 2 *1500 W (A.E.S.)
Available Impedance4 Ω/ 8 Ω/ 16 Ω
Sensitivity (1W/ 1m)*99 dB
Frequency Range30 Hz - 500 Hz
Peak Power (6 dB Crest Factor)6000 W (A.E.S.)
Resonance33 Hz
Voice Coil Winding Depth1.10" / 28.00 mm
Recommended Enclosure Volume90 - 250 Litres
Flux Density1.25 Tesla
Magnet MaterialY35 Ferrite
Magnet Gap Depth12.00 mm / 0.47"
Former MaterialGlass Fibre
Dust Dome MaterialSolid Paper
Voice Coil MaterialCopper (Inside / outside winding)
Cone MaterialPaper
Suspension MaterialPoly Cotton
Surround MaterialM Roll Poly Cotton
Thiele Small Parameters
Fs33 Hz
Re5.4 Ω
Le (@ 1 kHz)2.800 mH
Vas224 Litres
Mms197.00 g
Sd1164 cm2
Cms118.00 µm/N
BL31.50 T/m
Xmax11 mm
Vd1.274 Litres
Ref. Efficiency3.40%
EBP144.10 Hz
Dimensions & Mounting
Overall Diameter474 mm
Width Across Flats459 mm
Flange Height14.5 mm
Depth (Excl. Flange)194 mm
Magnet Diameter280 mm
Chassis Shoulder Diameter415 mm
Outer Bolt Circlex6 M8 on 456 mm PCD
Inner Bolt CircleN/A
Shipping Information
Nett Weight22.50 Kg / 49.60 lb
Shipping Weight23.30 Kg / 51.37 lb
* 2.83V. Half space response measured in a 975 litre sealed enclosure.

*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.

** Distortion is measured at 10% of the rated power (AES Standard).

1. AES Standard (30 to 300 Hz) Program 1000 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.
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