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Sub Bass Driver
  • Discontinued – Special Order / OEM Only
  • Contact for order information
  • Lightweight neodymium motor system
  • Heavy duty cast aluminium frame for increased rigidity
  • Low distortion
  • Long driver excursion
  • Double suspension system
  • Suitable for bass reflex or closed box designs but also works well in horn loaded designs


18" / 457.2 mm

Coil Diameter

5.0" / 127 mm

Power Rating

1000 W (A.E.S.)

Frequency Range

35 Hz - 1 kHz


98 dB


12 mm

The PD.185N01 is a versatile drive unit intended for use as a sub bass driver or woofer component that offers outstanding imaging, clean, undistorted, high fidelity sound coupled with pro audio power handling and performance. Although intended for use in bass reflex and closed box designs the unit also performs well in horn loaded applications.

Featuring an FEA optimised, compact neodymium motor system configuration that allows more efficient management of the electromagnetic flux and greatly reduced stray magnetic fields. The PD.185N01 is able to provide the same power handling capabilities as much larger ferrite-based motor systems with the added benefit of greatly reduced weight. The motor system configuration and rear vent plate design have been developed in conjunction to allow effective heat dissipation and airflow around the 5", in-house wound, voice coil which aids power handling and reduces power compression effects. Power handling is rated at 1000 W (AES) with an average sensitivity of 98 dB across the driver's working bandwidth of 35 Hz - 1 kHz. High quality, UK manufactured cone and surround combine with a large displacement, dual suspension system that provides excellent linear control and mechanical stability, allowing 45 mm peak to peak excursion before damage. The materials have also been carefully selected to provide optimum high fidelity audio reproduction.

SKU: PD.185N01 .8 Category:

Sorry, this product is out of manufacture and no longer available.

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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) * 4000 W (A.E.S.)
Power Rating 1 2 * 1000 W (A.E.S.)
Sensitivity (1W/ 1m) * 98 dB
Frequency Range 35 Hz - 1 kHz
Resonance 35.6 Hz
Voice Coil Winding Depth 28 mm / 1.10 "
Recommended Enclosure Volume 90 - 220 Litres
Flux Density 1.05 Tesla
Magnet Material Neodymium
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 35.6 Hz
Re 5 Ω
Qms 21.47
Qes 0.39
Qts 0.39
Le (@ 1 kHz) 0.62 mH
Vas 174.5 Litres
Mms 220.21 g
Sd 1164.16 cm²
Cms 0.09 mm/N
BL 24.87 T/m
Xmax 12 mm
Vd 1.397 Litres
Ref. Efficiency 1.90%
EBP 91.28 Hz
Dimensions & Mounting
Overall Diameter 474 mm
Width Across Flats 459 mm
Flange Height 14.5 mm
Depth (Excl. Flange) 185 mm
Magnet Diameter 166 mm
Chassis Shoulder Diameter 414.5 mm
Outer Bolt Circle 6x M8 on 455 mm PCD
Inner Bolt Circle N/A
Shipping Information
Nett Weight 11.5 Kg / 25.35 lb
Shipping Weight 12.9 Kg / 28.44 lb
*2.83V. Half space response measured in a 975 Litre sealed Enclosure. Blue Line = fundamental 45° off-axis.

1. AES Standard (35 to 350 Hz)
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.
Frequency Response & Impedance
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