Hertz Mille Pro MP 300 D2.3 / D4.3

Hertz Mille Pro MP 300 D2.3 / D4.3 - 12-inch Subwoofer for Controlled Deep Bass in the Car

The Hertz Mille Pro MP 300 D2.3 / D4.3 is a 12-inch subwoofer that combines high sound pressure with clean control in compact enclosures. With 600 W RMS and 1200 W Peak, a powerful ferrite motor, and a 65mm CCAW voice coil, it delivers deep, precise bass – ideal for sealed enclosures from 27 liters or as a bass reflex setup for more depth. You choose between D2.3 (2+2 Ω) and D4.3 (4+4 Ω) for the appropriate amplifier connection.

Technical Highlights

• 12-inch DVC subwoofer: optionally 2+2 Ω (D2.3) or 4+4 Ω (D4.3) for flexible wiring
• 600 W RMS / 1200 W Peak – thermally stable thanks to 65 mm, 4-layer CCAW voice coil
• TIL-P voice coil former with rear ventilation for efficient cooling and low mechanical losses
• V-shaped, rigid paper cone (water-repellent, mineral-reinforced) for low-distortion excursion
• IIR rubber surround without limiting edge for high linear excursion (Xmax 17 mm, Xmech ±27 mm)
• Low-resonance aluminum basket with large-area ventilation under the spider
• Solid terminal block for up to 8 AWG, covered against short circuit
• Compact high-performance motor made of high-density ferrite – designed for small, dense enclosures

Technical Data

• Size: 300 mm (12 inches)
• Power handling (RMS/Peak): 600 W / 1200 W
• Impedance (DVC): 4+4 Ω / 2+2 Ω
• Voice coil: Ø 65 mm (2.5 inches), 4-layer
• Magnet size (W x D x H): 165 x 75 x 35 mm
• Weight: 8.63 kg
• Magnet: high-density ferrite
• Cone: water-repellent pressed paper
• Xmech: ±27 mm

Electro-acoustic Parameters

• Effective diameter (D): 260 mm
• Xmax: 17 mm
• Re: 1.9 Ω
• Fs: 24 Hz
• Le: 1.6 mH
• Vas: 74 l
• Mms: 235 g
• Cms: 0.19 mm/N
• BL: 12 T·m
• Qts: 0.42 | Qes: 0.45 | Qms: 5.9
• SPL: 86 dB

Dimensions

• A: 321 mm
• B: 287 mm
• C: 187 mm
• D: 164 mm
• E: 327.5 mm
• F: 59 mm

Enclosure Recommendations

The MP 300 D2.3 / D4.3 was developed for compact, sealed enclosures from 27 liters and plays particularly controlled in them. For more depth, a bass reflex enclosure is suitable – here are the proven setups:

Sealed Box

• Internal volume (Vb): 28 l (0.99 cu.ft.)
• System resonance (Fb): 48 Hz
• Qtc: 0.82
• External dimensions (W x H x D): 450 x 360 x 280 mm
• Mounting cut-out: 287 mm
• Material thickness: 19 mm

Panel Cut – Sealed Box

• A: 450 x 360 mm – Quantity 2
• B: 450 x 242 mm – Quantity 2
• C: 322 x 242 mm – Quantity 2

Reflex Box (Bass Reflex)

• Internal volume (Vb): 36 l (1.27 cu.ft.)
• Tuning frequency (Fb): 33 Hz
• External dimensions (W x H x D): 620 x 390 x 330 mm
• Mounting cut-out: 287 mm
• Material thickness: 19 mm

Panel Cut – Reflex Box

• A: 620 x 390 mm – Quantity 2
• B: 620 x 292 mm – Quantity 2
• C: 352 x 292 mm – Quantity 2

Features in Detail

• Compact design – optimized for sealed enclosures from 27 l
• 65 mm CCAW voice coil (4-layer) with music power up to 1200 W; DVC 4 Ω + 4 Ω (D4.3) or 2 Ω + 2 Ω (D2.3)
• TIL-P former with ventilation behind the winding: better heat dissipation, high Qms
• Exponential V-cone with high rigidity for low distortion at large excursion
• IIR rubber surround without limiting edge for more SPL with constant outer diameter
• Mineral-reinforced paper cone: good combination of rigidity and damping
• Light, rigid aluminum basket with six spokes and ventilation under the spider
• Diamond-cut basket edge with subtle Hertz branding
• Solid terminal block for up to 8 AWG, with protective cover
• Optional wall mounting on the enclosure for best possible space utilization
• Compact high-performance motor with strong magnetic field at the coil

Installation & Compatibility

Choose the impedance to match the amplifier: The D2.3 (2+2 Ω) can be wired in parallel for 1-Ω operation, for example, and the D4.3 (4+4 Ω) accordingly for 2-Ω or 8-Ω setups. In sealed 28-l enclosures, you get controlled and precise sound; in 36-l reflex enclosures with 33 Hz tuning, you get more depth. Suitable components and accessories can be found at Carhifi.shop.