HERTZ MP 250 D4.3 PRO

The HERTZ MP 250 D4.3 PRO was developed for high-end car audio systems that require both precise, deep bass and high power handling. Thanks to its 65-mm dual voice coil, torsion-resistant mineral paper cone, and generously sized drive unit, it delivers controlled bass reproduction with high dynamics —both in compact sealed enclosures and in optimally tuned bass-reflex systems.

The special V-profile diaphragm ensures high rigidity while maintaining a low weight. Combined with the Boundary-Free rubber surround, this results in a large effective diaphragm area, allowing the subwoofer to deliver clean, low-distortion sound even at high volume levels. The sophisticated ventilation system keeps the voice coil cool even under continuous load and ensures consistent performance.

With its dual 4-ohm voice coil, the MP 250 D4.3 PRO offers numerous connection options and can be flexibly adapted to a wide variety of amplifier configurations. Its high mechanical strength and powerful ferrite magnet make it the ideal choice for high-quality sound and SPL-oriented systems.

Technical Specifications

• Subwoofer diameter: 250 mm (10 inches)
• RMS Power Handling: 600 watts
• Max. power rating: 1,200 watts
• Impedance: 2 × 4 ohms (dual voice coil)
• Voice coil: 65 mm (2.5 inches), 4-layer CCAW
• Diaphragm: Compressed paper with mineral fillers
• Bead: Boundary-Free IIR Butyl Rubber
• Magnet: High-density ferrite
• Frequency resonance (Fs): 27 Hz
• Sensitivity: 83.5 dB (1 W / 1 m)
• Xmax (linear): 17 mm
• Xmech: ±27 mm
• DC resistance (Re): 1.8 ohms
• Total quality (Qts): 0.50
• Electrical Quality (Qes): 0.53
• Mechanical Quality (Qms): 5.8
• Equivalent volume (Vas): 31 liters
• Moving mass (Mms): 187 g
• Voice coil inductance (Le): 1.60 mH
• Installation diameter: 236 mm
• Installation depth: 141 mm
• Outer diameter: 268 mm
• Weight: 7.8 kg
• Recommended enclosed case: 17 liters or more
• Recommended bass-reflex enclosure: approx. 22 liters