Hertz Mille MP 250 D2.3- 25cm Subwoofer

MP 250 D2.3 PRO

Outstanding performance in a compact size - that's the goal of the audio subwoofer Mille PRO for the car. The strength of the research and development department is its know-how from the development of Mille Legend. The R & D team has optimized the manufacturing process to make the "Hertz Sound Experience" accessible to a wider audience by sharing the technology and materials of the flagship of the product line in parts. The loudspeaker diaphragm of the MP 250 D2.3 is manufactured using the same construction method used for Legend: pulp is pressed with the addition of mineral powders. The V-cone® profile provides greater hardness so that the speaker diaphragm can serve as a piston. The material encasing them consists of high-purity IIR-butyl rubber. The Mille PRO subwoofer, like the Legend ML 2000.3 and the Legend ML 2500.3, is manufactured using Boundary Free Surround technology, which allows a larger emission area with the same diameter, so that higher sound pressure can be achieved. The compact, non-resonant, 6-spoke aluminum alloy basket, which is identical to the top of the range ML 2500.3, contributes to the subwoofer's mechanical damping and is absolutely sound-proof. The 4-layer 65mm voice coil is more than 60mm high and spooled in a TIL-P turn, providing high linear displacement. The configuration of an impedance of 2? + 2? DVC (Dual Voice Coil) makes the subwoofer so flexible that it can compete with any amplifier system. The system of air cooling and pressure relief makes it possible to dispense with a central hole in the bottom plate. This brings three advantages:

- Better thermal inertia, resulting in lower operating temperatures for musical transients; - The magnetic field induced in the coil is maximized - with the same overall dimensions of the motor. A larger amount of iron in the pole uses the maximum flux density that the magnet produces, thus reducing the likelihood of saturation magnetization; - With the possibility of installing the subwoofer directly on the wall of the box, the minimal dimensions are fully exploited. With the included rubber disc, the subwoofer can be attached to the box. It allows air exchange for the 10 vents in the floor.

The holes behind the winding of the voice coil and the 10 vents in the bottom plate provide a greater exchange of air to the inner layers of the coil and harmonize with the innovative mounting system. The air passes through the opening to keep the coil operating temperature low, even in extreme music programs. The connection has stable plug connections with a shorts preventing cover. The ability to use cables up to 8 AWG provides extremely low cabling resistance in low-impedance (1 ohm) configurations.

Technical specifications

• Size mm (inches): 250 (10)
• Resilience - Peak W: 1200
• Load capacity - continuous power B: 600
• Impedance: 2 + 2 ohms
• Sensitivity dB SPL: 83.5
• Voice coil diameter mm (inch): 65 (2.56)
• Xmax mm: 17.00
• X-Mech mm (inches): ± 27 (1.06)
• Re: 0.85 ohms
• Fs Hz: 30.00
• Vas l: 25.00
• Number: 0.54
• Q's: 0.6
• Qms: 5.92
• Spl dB: 83.5