Hertz Mille Pro MPS 300 S4 / S2

Hertz Mille Pro MPS 300 S4 / S2 - Flat 12-inch Subwoofer for Compact Enclosures and Powerful Bass

The Hertz Mille Pro MPS 300 S4 / S2 is a 12-inch subwoofer for setups with limited space. With an installation depth of only 88 mm, it fits under the back seats of pickups or in shallow trunks. It is optimized for very small, sealed enclosures and delivers up to 20% more cone excursion compared to common designs due to its high excursion capability. 500 W RMS power ensures sovereign bass – available as S2 or S4 versions for optimal matching with your amplifier.

Technical Highlights

• 12" (300 mm) subwoofer with a flat design
• Optimized for extremely compact, sealed enclosures
• Up to 20% more excursion compared to conventional designs
• 500 W RMS / 1000 W Peak
• Available as S2 or S4, 4 Ohm impedance variant
• Mounting depth 88 mm, voice coil 38 mm
• Polypropylene cone and high-density ferrite magnet
• Xmax 16.8 mm, Xmech 20 mm

Technical Data

• Size: 300 mm (12")
• Power handling RMS: 500 W
• Power handling Peak: 1000 W
• Impedance: 4 Ohm
• Mounting depth: 88 mm
• Voice coil type: S2 / S4
• Voice coil Ø: 38 mm
• Frequency response: 25 – 400 Hz
• Magnet size (W x D x H): 156 x 60 x 36 mm
• Weight: 6.64 kg
• Magnet: High-density flux ferrite
• Cone: Polypropylene
• Xmech: 20 mm

Electro-acoustic Specifications

• D: 262.59 mm
• Xmax: 16.80 mm
• Re: 3.4 Ohm
• Fs: 23 Hz
• Le: 3.75 mH
• Vas (l): 62.13
• Mms: 320 g
• Cms: 0.15 mm/N
• BL: 18.7 T*m
• Qts: 0.42
• Qes: 0.45
• Qms: 6.3
• SPL: 85 dB

Physical Dimensions

• A: 318.3 mm
• B: 282.5 mm
• C: 108.8 mm
• D: 88 mm
• E: 291.8 mm
• F: 42.6 mm

Enclosure Recommendations

The MPS 300 S4 / S2 performs particularly well in controlled, very compact sealed enclosures. If maximum sound pressure is a priority and more volume is available, bass reflex designs are the right choice.

Sealed Box

Tight, precise response with high energy between 20 and 40 Hz – ideal when you have limited space.

• Vb l (cu.ft.): 22.7 (0.8)
• Fb: 45 Hz
• Qtc: 0.78
• B: 510 mm
• H: 406 mm
• T: 160 mm
• Mounting hole: 283 mm
• Wood thickness: 16 mm

Panel Cutting List – Sealed Box

• A: 510 x 406 mm – Quantity 2
• B: 510 x 128 mm – Quantity 2
• C: 374 x 128 mm – Quantity 2

Reflex Box (Bass Reflex)

For high output with emphasis on 40 to 80 Hz, when enclosure volume is not a bottleneck.

• Vb l (cu.ft.): 36.8 (0.7)
• Fb: 33 Hz
• Qtc: -
• B: 713 mm
• H: 372 mm
• T: 130 mm
• Z: 146 mm
• P: 133 mm
• S: 60 mm
• Mounting hole: 283 mm
• Wood thickness: 16 mm

Panel Cutting List – Reflex Box

• A: 836 x 422 mm – Quantity 2
• B: 836 x 133 mm – Quantity 2
• C: 390 x 133 mm – Quantity 1
• D: 330 x 133 mm – Quantity 1
• E: 444 x 133 mm – Quantity 1

Installation & Compatibility

• Flat design: 88 mm mounting depth, suitable for under-seat or under-rear-seat installations.
• Coil variants: S2 or S4 for appropriate amplifier matching.
• Cutout size: 283 mm; proper sealing and screwing ensure performance.
• Recommended application: compact, sealed enclosures; optional bass reflex for higher output.