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Sub Bass Driver
  • New Ergonomic, Vented Cast Aluminium Chassis Offers Improved Thermal Control
  • 5.5” Inside/ Outside Windings, Copper, Vented Voice Coil
  • Vented Voice Coil And Coil Gap Reduces Power Compression Effects
  • Double Silicone Spider With Optimised Compliance
  • Suitable For Hybrid Horn-Loaded Designs
Klippel Verifeid


21” / 530 mm

Coil Diameter

5.5” / 138.7 mm

Power Rating

1500 W (A.E.S.)

Frequency Range

28 Hz - 150 Hz


97.5 dB


11.00 mm

The PD.2155-1F is an extremely low distortion and highly dynamic driver. Suitable for hybrid horn-loaded cabinet designs, the unit produces 97.5 dB sensitivity over it’s working band and is capable of handling 3000 W continuous program power.
Featuring a ceramic magnetic assembly generating very high force factor of 31.3 T/m and linear excursion. The design also incorporates an optimised suspension system and ribbed paper cone that provides exceptional mechanical stability and control. Providing the benefit of extremely low distortion and 60 mm peak-to-peak excursion before damage.

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Frequency Response Graph
Impedance GRAPH
General Specifications
Type Sub Bass Driver
Available Impedance 8 Ohm
Nominal Diameter 21” / 530 mm
Voice Coil Diameter 5.5” / 138.7 mm
Peak Power (6 dB Crest Factor) * 6000 W (A.E.S.)
Power Rating 1 2 * 1500 W (A.E.S.)
Sensitivity (1W/ 1m) * 97.5 dB
Frequency Range 28 Hz - 150 Hz
Resonance 33 Hz
Voice Coil Winding Depth 26.00 mm / 1.02”
Recommended Enclosure Volume 150 - 200 Litres
Flux Density 1.2 Tesla
Magnet Material Ceramic
Magnet Gap Depth 13.0 mm / 0.51”
Former Material Glass Fibre
Dust Dome Material Solid Paper
Voice Coil Material Copper (Inside / Outside Winding)
Cone Material Paper
Suspension Material Fabric
Surround Material Fabric
Thiele Small Parameters
Fs 35 Hz
Re 5.1 Ω
Qms 7.88
Qes 0.354
Qts 0.339
Le (@ 1 kHz) 1.48 mH
Le (@10 kHz) 3.23 mH
Vas 266 Litres
Mms 304 g
Sd 1520 cm2
Cms 65.5 μm/N
BL 31.3 T/m
Xmax 11.00 mm
Vd 1.67 Litres
Ref. Efficiency 3.1%
EBP 88.24 Hz
Dimensions & Mounting
Overall Diameter 550 mm
Width Across Flats 532 mm
Flange Height 14 mm
Depth (Excl. Flange) 205.48 mm
Magnet Diameter 280 mm
Chassis Shoulder Diameter 492 mm
Outer Bolt Circle x6 M8 on 528 mm PCD
Shipping Information
Nett Weight 26.5 kg / 58.42 lb
Shipping Weight 28.5 kg / 62.83 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.

1. AES Standard (20 to 200 Hz). Program 1500 Watts.
2. AES Recommended Practice.
3. Thiele - Small Parameters follow a 1000 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.
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