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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 31 T/m.
  • Double suspension
  • Appropriate for applications as diverse as scoop bins, conventional reflex cabinets and horn loaded systems
  • Increased excursion over an 1850/2


18" / 457.2 mm

Coil Diameter

5.0" / 127 mm

Power Rating

1000 w (A.E.S.)

Frequency Range

35 Hz - 2 kHz


98 dB


12 mm
SKU: PD.1851/2.8 Category:

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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 - 2 kHz
Resonance 37.03 Hz
Voice Coil Winding Depth 29 mm / 1.14"
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 Acrylic
Surround Material HGBC
Thiele Small Parameters
Fs 37.03 Hz
Re 5.23 Ω
Qms 18.49
Qes 0.27
Qts 0.26
Le (@ 1 kHz) 1.04 mh
Vas 160.46 litres
Mms 219.22 g
Sd 1164.16 cm2
Cms 84.33 µm/N
BL 31.48 T/m
Xmax 12 mm
Vd 1.397 litres
Ref. Efficiency 2.31%
EBP 137.14 Hz
Dimensions & Mounting
Overall Diameter 474 mm
Width Across Flats 459 mm
Flange Height 14.5 mm
Depth (Excl. Flange) 178 mm
Magnet Diameter 280 mm
Chassis Shoulder Diameter 414.5 mm
Outer Bolt Circle 6 * M8 on 455mm PCD
Inner Bolt Circle N/A
Shipping Information
Nett Weight 24.8 Kg / 54.67 lb.
Shipping Weight 28.6 Kg / 63.05 lb.
*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.

1. AES Standard (35 to 350 Hz) Program 1600 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.
Frequency Response & Impedance
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