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Sub Bass Driver
  • Heavy-duty cast aluminium chassis for increased rigidity
  • Power compression 2dB at rated power
  • A B/L in excess of 37 T/m
  • Double suspension system
  • Suitable for horn loaded or bass reflex designs


21" / 530 mm

Coil Diameter

6" / 152 mm

Power Rating

1000 w (A.E.S.)

Frequency Range

30 Hz - 1 kHz


98 dB


10.5 mm
SKU: PD.2150.8 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 21" / 530 mm
Voice Coil Diameter 6" / 152 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 30 Hz - 1 kHz
Resonance 29.5 Hz
Voice Coil Winding Depth 30 mm / 1.18"
Recommended Enclosure Volume 130 - 350 Litres
Flux Density 1.1 Tesla
Magnet Material Ceramic
Magnet Gap Depth 15 mm / 0.59"
Former Material Glass Fibre
Dust Dome Material Paper
Voice Coil Material Copper
Cone Material Paper
Suspension Material Dual Fabric
Surround Material Fabric
Thiele Small Parameters
Fs 29.5 Hz
Re 5.52 Ω
Qms 14.21
Qes 0.28
Qts 0.27
Le (@ 1 kHz) 2.1 mh
Vas 309.3 litres
Mms 382.86 g
Sd 1698.23 cm2
Cms 76.4 µm/N
BL 37.42 T/m
Xmax 10.5 mm
Vd 1.712 litres
Ref. Efficiency 3.39%
EBP 105.35 Hz
Dimensions & Mounting
Overall Diameter 555 mm
Width Across Flats 535 mm
Flange Height 15 mm
Depth (Excl. Flange) 215 mm
Magnet Diameter 316 mm
Chassis Shoulder Diameter 495 mm
Outer Bolt Circle 6 * M8 on 526
Inner Bolt Circle N/A
Shipping Information
Nett Weight 31.75 Kg / 70 lb.
Shipping Weight 33.75 Kg / 74.41 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 (30 to 300 Hz) Program 2000 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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