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Bass / Mid Range Driver
  • Out of Manufacture – No longer Available
  • Radial Neodymium Motor structure
  • Vented cast aluminium chassis for improved thermal control of voice coil
  • Forced air cooling vented voice coil gap
  • Aluminium demodulation ring
  • 3″ High temperature Copper voice coil
  • Rear aluminium heat sink
Radial Neo Technology


12" / 304.8 mm

Coil Diameter

3.0" / 76.2 mm

Power Rating

550 W (A.E.S.)

Frequency Range

45 Hz - 3.5 kHz


99 dB


7.5 mm
SKU: PD.123NR1.8 Categories: , Tag:

£253.35 MRRP Ex. VAT

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Frequency Response Graph
Impedance GRAPH
General Specifications
Type Bass / Mid Range Driver
Available Impedance 4 Ω/ 8 Ω/ 16 Ω
Nominal Diameter 12" / 304.8 mm
Voice Coil Diameter 3.0" / 76.2 mm
Peak Power (6 dB Crest Factor) * 2200 W (A.E.S.)
Power Rating 1 2 * 550 W (A.E.S.)
Sensitivity (1W/ 1m) * 99 dB
Frequency Range 45 Hz - 3.5 kHz
Resonance 43 Hz
Voice Coil Winding Depth 0.77" / 19.50 mm
Recommended Enclosure Volume 25 - 70 Litres
Flux Density 1.25 Tesla
Magnet Material Neodymium
Magnet Gap Depth 10.00 mm / 0.39"
Former Material Glass Fibre
Dust Dome Material Solid Paper
Voice Coil Material Copper
Cone Material Paper
Suspension Material Fabric
Surround Material M Roll Poly Cotton
Thiele Small Parameters
Fs 43 Hz
Re 5.5 Ω
Qms 6.5
Qes 0.207
Qts 0.2
Le (@ 1 kHz) 1.870 mH
Vas 96 Litres
Mms 56.00 g
Sd 533 cm2
Cms 244.00 µm/N
BL 20.50 T/m
Xmax 7.5 mm
Vd 0.370 Litres
Ref. Efficiency 3.65%
EBP 207.73 Hz
Dimensions & Mounting
Overall Diameter 330.00 mm
Width Across Flats 320 mm
Flange Height 10.00 mm
Depth (Excl. Flange) 141.00 mm
Magnet Diameter 120 mm
Chassis Shoulder Diameter 279.50 mm
Outer Bolt Circle x4 M6 on 318 mm PCD
Inner Bolt Circle N/A
Shipping Information
Nett Weight 5.70 Kg / 12.57 lb
Shipping Weight 6.30 Kg / 13.89 lb
* Half space response measured in a 950 Litre sealed enclosure.

*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.

** Distortion is measured at 10% of the rated power (AES Standard).

1. AES Standard (45 to 450 Hz) Program 550 Watts.

2. AES Recommended Practice.

3. Thiele - Small Parameters follow a 500 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.
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