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Mid Range Driver
  • New ergonomic, vented cast aluminium chassis offers improved thermal control
  • Improved motor plating providing a more resilient finish and resistance to corrosion
  • Mid range transducer suitable for either direct radiating or horn-loaded applications
  • Smooth frequency response for easy integration across vocal frequency band
Klippel Verifeid


12” / 300 mm

Coil Diameter

2.5” / 63 mm

Power Rating

300 W (A.E.S.)

Frequency Range

100 Hz - 6 kHz


99 dB


2.7 mm

The PD.121/2 excels in a variety of systems being perfectly suited to either direct radiating or horn loaded applications. Covering the critical vocal range in a single unit the PD.121/2 is particularly effective at faithfully reproducing the pattern of powerful low end male vocals.

The PD.121 perfectly compliments our 15”, 18”, 21” and 24” transducers as part of a three-way system.

£151.25 MRRP Ex. VAT

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General Specifications
Type Mid Range Driver
Available Impedance 4 / 8 / 16 Ohm
Nominal Diameter 12” / 300 mm
Voice Coil Diameter 2.5” / 63 mm
Peak Power (6 dB Crest Factor) * 1200 W (A.E.S.)
Power Rating 1 2 * 300 W (A.E.S.)
Sensitivity (1W/ 1m) * 99 dB
Frequency Range 100 Hz - 6 kHz
Resonance 53.27 Hz
Voice Coil Winding Depth 12 mm / 0.47”
Recommended Enclosure Volume 10 - 60 Litres
Flux Density 1.5 Tesla
Magnet Material Ceramic
Magnet Gap Depth 9 mm / 0.35”
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 53.27 Hz
Re 5.93 Ω
Qms 14.66
Qes 0.23
Qts 0.23
Le (@ 1 kHz) '-
Le (@10 kHz) 0.42 mH
Vas 66.58 Litres
Mms 65.37 g
Sd 530.93 cm2
Cms 168.33 μm/N
BL 21.46 T/m
Xmax 2.7 mm
Vd 0.143 Litres
Ref. Efficiency 5.10%
EBP 231.60 Hz
Dimensions & Mounting
Overall Diameter 331 mm
Width Across Flats 320 mm
Flange Height 11 mm
Depth (Excl. Flange) 112.23 mm
Magnet Diameter 200 mm
Chassis Shoulder Diameter 282 mm
Outer Bolt Circle x4 M6 on 318 mm PCD
Inner Bolt Circle x8 M6 on 293 mm PCD
Shipping Information
Nett Weight 9.20 kg / 20.28 lb
Shipping Weight 10.00 kg / 22.05 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.
** Distortion is measured at 10% of the rated power (AES Standard).

1. AES Standard (60 to 600 Hz). Program 600 Watts.
2. AES Recommended Practice.
3. Thiele - Small Parameters follow a 300 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.
Frequency Response & Impedance
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