Hertz Mille Pro MP 250 D4.3 10 Inch Dual Voice Coil Car Subwoofer Sub 4ohms 600w

The Hertz Mille Pro MP 250 D4.3 is a 10 inch (250 mm) dual voice coil car subwoofer with two 4 ohm coils, rated at 600 W RMS and 1200 W peak. It is part of the Mille Pro range, built using technologies inherited from the flagship Mille Legend line.

Also available with 2+2 ohm coils as the MP 250 D2.3. Matching grille: MG 250.3.

Key specifications

• Size: 250 mm (10 inch)
• Power handling: 600 W continuous, 1200 W peak
• Impedance: dual 4 ohm (4+4)
• Voice coil: 65 mm, four-layer, TIL-P former
• Magnet: high density flux ferrite
• Cone: pressed pulp with mineral powders, V-cone® profile
• Surround: high-purity IIR-butyl rubber
• Basket: compact 6-spoke aluminium alloy anti-resonant
• Xmech: ±27 mm
• Terminals: push type, up to 8 AWG

MP 250 D4.3 PRO

250 mm (10 in.) | Subwoofer | 1200 W | 4+4 Ohm

The Mille Pro range delivers extreme dynamics, high power handling and a realistic sound stage in a compact footprint. The MP 250 D4.3 carries over key materials and construction techniques from the Mille Legend flagship line to bring that performance to a wider audience.

The cone is made by pressing paper pulp with injected mineral powders — the same technique used for Legend. The V-cone® profile adds rigidity so the cone behaves like a piston. The surround is high-purity IIR-butyl rubber. Like the Legend ML2000.3 and ML2500.3, Mille Pro subwoofers use Boundary Free Surround technology, which increases the effective emission surface for a given diameter and raises sound pressure output.

The compact 6-spoke aluminium alloy anti-resonant basket is shared with the top-model ML 2500.3. It aids mechanical damping and remains acoustically transparent. The 65 mm four-layer voice coil is wound on a TIL-P former, delivering high linear displacement.

The 4 Ω + 4 Ω DVC impedance configuration gives flexibility to match 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 to the coil within the same overall motor dimensions — more iron in the pole reduces the risk of magnetic saturation and exploits maximum flux density from the magnet.
• The subwoofer can be mounted directly against the box wall. A damping rubber disc (supplied) secures it 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. They work with an innovative assembly system that forces air through the air gap, keeping coil temperature low even under extreme use. The push-type terminals include an anti-short-circuit cover and accept cables up to 8 AWG, keeping wiring resistance ultra-low in 1 ohm configurations.