Hertz Mille Pro MP 300 D2.3 12 Inch Dual Voice Coil Car Subwoofer Sub 2ohms 600w

The Hertz Mille Pro MP 300 D2.3 is a 12-inch (300 mm) dual voice coil subwoofer with two 2-ohm coils, rated at 600 W RMS and 1200 W peak. It features Boundary Free Surround technology and belongs to the Mille Pro range by Hertz.

Also available with 4+4 ohm coils as the MP 300 D4.3. Matching grille: MG 300.3.

Key specifications

• Size: 300 mm (12 inch)
• Power handling: 600 W continuous, 1200 W peak
• Impedance: dual 2 ohm (2+2)
• Sensitivity: 86 dB
• Voice coil: 65 mm, four-layer
• Magnet: high density flux ferrite
• Xmech: ±26 mm
• Terminals: push type, up to 8 AWG

MP 300 D2.3 PRO

300 mm (12 in.) | Subwoofer | 1200 W | 2+2 Ohm

The Mille Pro subwoofer range is built on technology developed for the Mille Legend line, refined to bring the Hertz sound experience to a broader audience. The MP 300 D2.3 delivers extreme dynamics and high power handling in a compact format.

The cone is pressed paper pulp with injected mineral powders — the same construction used on the Legend line. The V-cone® profile adds rigidity so the cone behaves like a piston. The surround is high-purity IIR-butyl rubber.

Like the Legend ML 2000.3 and ML 2500.3, Mille Pro subwoofers use Boundary Free Surround technology, which increases the effective emission surface without increasing diameter, producing higher sound pressure. The compact 6-spoke aluminium alloy anti-resonant basket is shared with the top-model ML 2500.3, contributing to mechanical damping while remaining acoustically transparent. The 65 mm four-layer voice coil is wound in a TIL-P former, delivering high linear displacement.

The 2 Ω + 2 Ω DVC impedance configuration improves compatibility with a wide range of amplifier systems. The air cooling and decompression system removes the need for a centre hole on the bottom plate, providing three benefits:

• Better thermal inertia, keeping operating temperatures low during musical transients.
• Maximised magnetic field at the coil with the same overall motor dimensions — greater iron in the pole reduces the risk of magnetic saturation and exploits the maximum flux density from the magnet.
• The subwoofer can be mounted directly against the box wall, making full use of its compact dimensions. A damping rubber disc (included) secures it to the box and maintains air exchange through the 10 vents on the bottom plate.

Holes behind the voice coil winding and the 10 bottom-plate vents increase air exchange to the coil's inner layers. These work with an innovative assembly system that forces air through the air gap, keeping coil temperatures low even under extreme use. The push-type terminals include an anti-short-circuit cover and accept cables up to 8 AWG, ensuring ultra-low wiring resistance in low-impedance (1 ohm) configurations.