Mille PRO shallow subwoofers have been meticulously designed to deliver exceptional performance even in situations where space is extremely limited for installing a subwoofer box.
The MPS 250 S4 is specifically optimized to excel in ultra-compact sealed boxes, starting from a mere 14 liters (0.49 cubic feet). A prime example of its application would be in subwoofer enclosures placed under the rear bench of pickup trucks, where space and height constraints are significant challenges.
The Mille PRO subwoofer sets a new standard with its depth/performance ratio, which has never been achieved before, thanks to an impressive 20% increase in cone excursion capacity compared to traditional designs.
This remarkable achievement is made possible by an ingenious suspension group design featuring a dedicated support structure for the spider and coil. This innovative solution allows the magnetic group to be positioned inwards, reducing the depth while maximizing the cone's linear excursion.
Key Features:
1. Ultra-shallow overall depth
2. 500W continuous power handling
3. Optimized for extremely-compact sealed enclosures of 12-14 liters (0.4-0.5 cubic feet)
4. Air Intercooling Revolution (A.I.R.) prevents air-compression-related limitations
5. Unrivalled mechanical excursion, +20% over traditional designs
6. Six-layer copper voice coil (38mm/1.5 in.) ensures high thermal capacity
7. Non-vented rear design allows for reduced enclosure depth
8. Robust screw-less mesh grille included, with black screws provided
9. Die-cast aluminum frame
10. Solid horizontal 8AWG spring-loaded terminals
11. EID: Scan, Discover, Identify
| Nominal diameter | 250 mm (10 in) |
| Impedance | 4 Ohm |
| Power Handling - Peak | 1000 W |
| Power Handling - Continuous | 500 W |
| Sensitivity | 83.5 dB |
| Frequency Response | 25 - 400 Hz |
| Voice Coil Ø | 38 mm (1.5 in) |
| Chassis Material | ALLUMINIUM |
| Magnet Material | HIGH DENSITY FLUX FERRITE |
| Magnet size D x d x h | 134 x 55 x 36 mm (6.28 x 2.17 x 1.42 in) |
| Voice Coil Material | COPPER |
| Cone Material | POLYPROPYLENE |
| Surround Material | Nitrile rubber (NBR) |
| Xmax | 16.8 mm (0.66 in) |
| Xmech | 20 mm (0.79 in) |
| Voice Coil Winding Height | 37 mm (1.46 in) |
| Gap Height | 7 mm (0.28 in) |
| D | 216.6 mm (33.573 in) |
| Re | 3.3 Ohm |
| Fs | 29 Hz |
| Le | 3.65 mH |
| Vas | 21.2 l (0.749 ft) |
| Mms | 234 g (8.254 oz) |
| Cms | 0.11 mm/N |
| BL | 17.3 T•m |
| Qts | 0.48 |
| Qes | 0,52 |
| Qms | 5.6 |
| Spl | 83.5 dB |
| Reference Efficiency | 83.5 |
| Mounting Depth | 83.6 mm |
| Grilles Included | Yes |
| Dimension A | 274.5 mm (10.81 in) |
| Dimension B | 231.6 mm (9.12 in) |
| Dimension C | 103.2 mm (4.06 in) |
| Dimension D | 83.6 mm (3.29 in) |
| Dimension E | 244.6 mm |
| Dimension F | 38.9 mm |
|
| VB l | 14.2 (0.5 cu. ft.) |
| FB Hz | 49 |
| QTC | 0.81 |
| W mm | 386 (15.2 in) |
| H mm | 352 (13.86 in) |
| D mm | 160 (6.3 in) |
| Mounting Hole mm | 232 (9.13 in) |
| Wood Thickness mm | 16 (0.63 in) |
| VB l | 14.2 (0.5 cu. ft.) |
| FB Hz | 49 |
| QTC | 0.81 |
| W mm | 615 (24.21 in) |
| H mm | 352 (13.86 in) |
| D mm | 110 (4.33 in) |
| Mounting Hole mm | 232 (9.13 in) |
| Wood Thickness mm | 16 (0.63 in) |
| A mm | 386 x 352 (15.20 x 13.86 in) |
| Qty Pcs | 2 |
| B mm | 386 x 128 (15.20 x 5.04 in) |
| Qty Pcs | 2 |
| C mm | 320 x 128 (12.60 x 5.04 in) |
| Qty Pcs | 2 |
| A mm | 615 x 352 (24.21 x 3.07 in) |
| Qty Pcs | 2 |
| B mm | 615 x 78 (24.21 x 3.07 in) |
| Qty Pcs | 2 |
| C mm | 320 x 78 (12.60 x 3.07 in) |
| Qty Pcs | 2 |
| Suggested Subsonic filter cut-off | 15 Hz / 24dB Oct |
| Suggested Lo-pass filter cut-off | 70-80 Hz / 24 db Oct |
| VB l | 19 (0.7 cu. ft.) |
| FB Hz | 35.5 |
| W mm | 713 (28.07 in) |
| H mm | 372 (14.65 in) |
| D mm | 130 (5.12 in) |
| Mounting Hole mm | 232 (9.13 in) |
| Wood Thickness mm | 16 (0.63 in) |
| Z mm | 146 (5.75 in) |
| P mm | 98 (3.86 in) |
| S mm | 52.3 (2.06 in) |
| Lp-Port Length mm | 511 (20.12 in) |
| VB l | 19 (0.7 cu. ft.) |
| FB Hz | 35.5 |
| W mm | 882 (34.72 in) |
| H mm | 372 (14.65 in) |
| D mm | 110 (4.33 in) |
| Mounting Hole mm | 232 (9.13 in) |
| Wood Thickness mm | 16 (0.63 in) |
| Z mm | 146 (5.75 in) |
| P mm | 78 (3.07 in) |
| S mm | 65.7 (2.59 in) |
| Lp-Port Length mm | 511 (20.12 in) |
| A mm | 713 x 372 (28.07 x 14.65 in) |
| Qty Pcs | 2 |
| B mm | 713 x 98 (28.07 x 3.86 in) |
| Qty Pcs | 2 |
| C mm | 340 x 98 (13.39 x 3.86 in) |
| Qty Pcs | 1 |
| D mm | 288 x 98 (11.34 x 3.86 in) |
| Qty Pcs | 1 |
| E mm | 495 x 98 (19.49 x 3.86 in) |
| Qty Pcs | 1 |
| A mm | 882 x 372 (34.72 x 14.65 in) |
| Qty Pcs | 2 |
| B mm | 882 x 78 (34.72 x 3.07 in) |
| Qty Pcs | 2 |
| C mm | 340 x 78 (13.39 x 3.07 in) |
| Qty Pcs | 1 |
| D mm | 274 x 78 (10.79 x 3.07 in) |
| Qty Pcs | 1 |
| E mm | 495 x 78 (19.49 x 3.07 in) |
| Qty Pcs | 1 |
| Suggested Subsonic filter cut-off | 20 Hz / 24dB Oct |
| Suggested Lo-pass filter cut-off | 60-70 Hz / 24 db Oct |
1. Ultra-shallow overall depth
2. 500W continuous power handling
3. Optimized for extremely-compact sealed enclosure 12-14L (0.4-0.5CF)
4. Air Intercooling Revolution (A.I.R.) prevents air-compression-related limitations
5. Unrivalled mechanical excursion, +20% over traditional designs
6. Six-layer copper voice coil (38mm/1.5 in.) ensures high thermal capacity
7. Non-vented rear design allows reduced enclosure depth
8. Robust screw-less mesh grille included with black screws provided
9. Die-cast aluminum frame
10. Solid horizontal 8AWG spring-loaded terminals
11. EID: Scan, Discover, Identify
The exclusive technology providing the traceability of the Mille.3 products from their birth on. Once the test phase has been passed, the code linked to destination country/market is applied. When purchasing the product, by scanning the code, the user can check through the web the information about the product and can log into the registration page.
Hertz R&D has developed the proprietary AIR (Air Intercooling Revolution) technology, optimizing the fluid dynamics inside the voice coil inner chamber and the magnetic group to minimize the internal compression of air and maximize cooling capacity.
Music fans who attend live concerts know well the emotions that low undistorted frequencoes without dynamic compression can arouse.
For this reason, the HertzAudioVideo R&D created Mille car audio subwoofers
The subwoofers are optimized to work in ultra-compact sealed boxes starting from only 14 Lt (0.49 Cf) for 10′ models (MPS 250) and 22,7 (0.8 Cf) for 12’models (MPS 300). A typical example is a subwoofer enclosure under the rear bench of pickup trucks, where the space – and the height – are limited.
The new MPS (Mille PRO Shallow) subwoofers have a depth/performance ratio never achieved before thanks to the impressive cone excursion capacity which is 20% higher than a traditional design.
This exceptional target has been achieved thanks to the smart suspension group design featuring a dedicated support structure for spider and coil. This solution has allowed to move the magnetic group inwards, reducing the depth and at the same time maximizing cone linear excursion.
500 W continuous power handling is an incredible result for such a compact subwoofer. To accomplish this ambitious goal, the Hertz R&D has developed the proprietary AIR (Air Intercooling Revolution) technology, optimizing the fluid dynamics of the inner acoustic structure and the magnetic group to minimize the internal compression of air and maximize cooling capacity. The 6 layers, 1.5 in. (38 mm) voice-coil with cooling openings on the former contributes to the thermal stability of the subwoofer, making MPS subs ready to face to most demanding high-spl listening session.
The design of the magnetic unit has been FEM simulated to maximize force factor (BxL) symmetry and thus obtain an optimal linearity even at high excursions, perfectly controlling the inductance modulation.
Pole piece geometry has been optimized using a breakthrough simulation model that allowed improving unit force factor.
Hertz R&D also focused on modeling the cone/enclosure behavior: inside a sealed box, air behaves like a spring – a non-linear suspension – whose effect must be compensated to obtain a system as linear as possible at high excursions.
The lineup includes two sizes, 10 and 12 in., each one available in 2Ω or 4Ω voice coils configuration, removing all barriers to creativity with custom installations.
Mille PRO ultra-shallow sealed enclosure are specifically optimized to deliver all the MPS subwoofer performances providing breathtaking low frequency from a box that is only 160 mm (6.3 in.) deep for MPBX 250 S2 and 175 mm (6.89) for MPBX 300 S2.
They are the Ideal choice to be installed under the rear bench of pickup trucks and generally where the space – and the height – are limited.
Hertz R&D department meticulously design the perfect sealed enclosure for MPS 250 S2 and MPS 300 S2 shallow-subwoofer using the most advanced technologies and massive in-car listening sessions to fine-tune the sound.
The panel-to-panel internal bracing on all sides of the box featuring solid corners minimize resonances. The internal sound-absorbing material virtually increase the volume of the box and further damp acoustic resonances. The 15 mm (0,59 in.) wood thickness provides an incomparable robustness.
2S² (2 Sides/2 Sounds) design provides the ability to choose between up-firing install to obtain more punch and definition and down-firing mounting, through supplied feet with Hook-and-loop inserts , to increase the low-frequency extension.
Thanks to SSP (Sub Smart Plug), MPBX feature both Plug-&-Play terminal block and traditional push terminals providing bulletproof connection and quick release.
The robust screw-less mesh grille is included, and the round corners ease the placement.
MP 250.3 Mille PRO features V-cone® and Boundary Free Surround technologies.
Outstanding performance in a compact size, this is Mille Pro Subwoofer’s target. On the strength of its know-how acquired with Mille Legend, the R&D team has optimized the production process to offer the “Hertz Sound Experience” to a wider audience using part of the technologies and materials of the flagship line.
The Mille Pro cone is made by pressing paper pulp with the injection of mineral powders, the same construction technique used for Legend. The V-cone® profile increases rigidity, allowing the cone to function like a piston. Surround materials consist of high-purity IIR-butyl rubber. Like the Legend ML2000.3 and ML2500.3, the Mille PRO subwoofers are
built with Boundary Free Surround technology allowing for a greater emission surface with equal diameter, generating higher sound pressure.The compact 6-spoke aluminum alloy anti-resonant basket is the same as the top model ML2500.3 and contributes to the subwoofer’s mechanical damping, being absolutely transparent to the sound.
The 65-mm 4-layer voice coil is higher than 60 mm and wound in a TIL-P former, thus delivering high linear displacement. The air cooling and decompression system avoids the need for a centre hole on the bottom plate with three advantages:
– Better thermal inertia to ensure low operating temperatures during musical transients;
– Maximization of the magnetic field induced to the coil with the same overall motor dimensions. Thanks to a greater amount of iron in the pole the likelihood of magnetic saturation decreases exploiting the maximum flux density generated from the magnet;
– Possibility to install the subwoofer right on the box wall, taking full advantage of its minimal dimensions. A damping rubber disk, provided with the product, secures the
subwoofer to the box and ensures air exchange for the 10 vents on the bottom.
The holes behind the voice coil winding and the 10 vents on the bottom plate ensure greater air exchange to the coil inner layers and work in synergy with an innovative assembly system. It forces the air to pass through the air gap to keep the coil operating temperature low, even with the most extreme musical programs.
The terminal uses solid push connectors with an antishort circuit cover accepting cables up to 8 AWG to provide ultra-low wiring resistance in low impedance configurations (1ohm). The chart shows the connection diagram for each impedance configuration.
MP 250.3 Mille PRO: 4 layers massive Voice-Coil
MP 250.3 Mille PRO: central pole without hole
MP 250.3 Mille PRO former with venting holes
The use of the most sophisticated FEA (Finite Element Analysis) simulation tools allowed the identification of ideal design solutions for the designated target: outstanding performance in a compact size. The lineup includes two sizes, 10 and 12 in., each one available in 2Ω + 2Ω or 4Ω + 4Ω double voice coils configuration, removing all barriers to creativity with custom installations.
MP 250 with optional grill MPG 250, also available for MP 300 (MPG 300)
eID (Elettromedia Identification) provides the traceability of the
Mille.3 products from their birth on.
eID (Elettromedia Identification) is the exclusive technology providing the traceability of the Mille.3 products from their birth on.
Once the test phase has been passed, the code linked to destination country/market is applied. When purchasing the product, by scanning the code, the user can check through the web the information about the product and can log into the registration page; by filling it out, the user will be entitled to one additional year of warranty coverage*.
This way the user will have the certainty of owning a genuine Hertz product, purchased through the official channel.
*in those countries where the agreement with the partner has been made.
