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
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Download PDF Datasheet

The PD.2155-1N is an extremely low distortion and highly dynamic driver. Suitable for hybrid horn-loaded cabinet designs, the unit produces 98 dB sensitivity over it’s working band and is capable of handling 3000 W continuous program power.
Featuring a neodymium magnetic assembly generating very high force factor of 30 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 60mm peak-to-peak excursion before damage.

Frequency Response GRaPH
Impedance GRAPH
General Specifications
Nominal Diameter21” / 530 mm
Voice Coil Diameter5.5” / 138.7 mm
Available Impedances8 Ohm
Power Rating 1 2 *1500 W (A.E.S.)
Peak Power (6dB Crest Factor)*6000 W (A.E.S.)
Sensitivity (1W – 1m)*98 dB
Frequency Range30 Hz - 300 Hz
Recommended Enclosure Volume150 - 200 Litres
Resonance33 Hz
Voice Coil Winding Depth26.00 mm / 1.02”
Magnet Gap Depth13.0 mm / 0.51”
Flux Density1.45 Tesla
Magnet MaterialNeodymium
Magnet Weight
Voice Coil MaterialCopper
Former MaterialGlass Fibre
Dust Dome MaterialSolid Paper
Suspension MaterialFabric
Cone MaterialPaper
Surround MaterialFabric
Thiele Small Parameters
Fs33 Hz
Re5.1 Ω
Le (@1 kHz)-
Le (@10 kHz)2.4 mH
Vas241 Litres
Mms320 g
Sd1520 cm2
Cms73.4 μm/N
BL30 T/m
Xmax11.00 mm
Vd1.67 Litres
Ref. Efficiency2.2%
EBP88.24 Hz
Dimensions & Mounting
Overall Diameter21” / 530 mm
Widths Across Flats532 mm
Flange Height14 mm
Depth (Excl. Flange)214 mm
Magnet Diameter184 mm
Chassis Shoulder Diameter492 mm
Outer Bolt Circlex6 M6 on 528 mm PCD
Inner Bolt Circle


Shipping Information
Nett Weight12.50 kg / 27.56 lb
Shipping Weight14.5 kg / 29.56 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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