AD4212 D4


  • 500W – 1,500W optimal power range
  • 3 inch voice coil
  • Triple stack 225oz motor
  • 23.5mm Xmax
  • Double high current tinsel leads
  • Nomex spider
  • Designed for use in small vented enclosures.
  • Engineered in the USA.
SKU: AD4212 D4 Categories: ,


The 4000 series 12 employs a finely-tuned balance of damping and extensive motor force to achieve very high efficiency, offering exceptional versatility and unmatched performance in a variety of real-world functions.

Fs 32.100 Hz
Qms 5.234
Vas 21.950 liters
Cms 0.072 mm/N
Mms 338.400 g
Rms 13.183 kg/s
Dia 243.000 mm
Sd 463.770 sq cm

Qes 0.472
Re 7.540 ohms
Le 4.071 mH
Z 9.048 ohms
BL 33.009 Tm
BL^2/Re 144.510 N^2/W

Qts 0.433
no 0.148 %
SPL 83.856 dB
EBP 67.965

XMax 23.5mm

Nominal Diameter 12in
Overall Diameter 12.60in / 320mm
Mounting Hole Diameter 11.02in / 280mm
Bolt Hole Circle Diameter
Motor Outer Diameter 7.72in / 196mm
Mounting Depth 7.64in / 194mm
Required Pole Vent Clearance
Driver Displacement 0.114 cu ft / 3.24 l

Minimum Sealed Volume N/A
Minimum Vented Volume  1.17 cu ft / l net*

* Tune for desired response



The above designs have been engineered for a “two tier” balance of compatibility: First, between the cabin acoustics of a sedan, hatchback and an SUV, and second, between the two available voice coil configurations, for a total of six balance points. This ensures a linear response and optimal power handling for listening purposes under most circumstances. Please visit our Enclosure Design Service page for custom designs.