Hertz MPBX 250 S2 10" 1000W Ultra-Shallow Sealed Sub Enclosure

Hertz MPBX 250 S2 10" 1000W Ultra-Shallow Sealed Subwoofer Enclosure

Purpose-engineered to unlock the full potential of the Hertz MPS 250 S2 subwoofer, the MPBX 250 S2 delivers a complete ultra-shallow sealed bass solution with dual-firing orientation, professional-grade terminal connectivity, and a precision-constructed enclosure in a single self-contained package.

Product Overview

The MPBX 250 S2 is Hertz's optimised sealed enclosure for the MPS 250 S2 10" subwoofer, engineered as a matched system where driver and enclosure are developed together for maximum acoustic performance. The ultra-shallow profile makes it suitable for installations where depth is a critical constraint, while the 15mm wood construction with panel-to-panel internal bracing and solid corners provides structural rigidity that minimises resonance and colouration across the full operating range. Internal sound-absorbing material virtually increases the effective box volume and further reduces acoustic resonances, compensating for the physically compact dimensions of the enclosure.

The 2S2 (2 Sides/2 Sounds) design gives the installer a choice between two mounting orientations. Down-Firing installation, using the supplied levelling feet with Hook-and-loop inserts, increases low-frequency extension for deeper, more powerful bass. Up-Firing installation provides more punch and definition, better suited to installations where transient accuracy is prioritised over maximum low-end extension. Both options are supported by the included hardware without requiring additional components.

The SSP (Sub Smart Plug) terminal system provides two connection methods simultaneously: a Plug-and-Play terminal block for quick-release connection and traditional push terminals for conventional speaker wire termination. A robust screw-less mesh grille with adjustable logo position is included, suitable for both standard and reverse installation orientations. The eID (Elettromedia Identification) system allows product authenticity and specification to be verified by scanning the code linked to the destination country and market. Handling 500 watts continuous and 1000 watts peak at 2 ohms, the MPS 250 S2 driver features a six-layer copper voice coil, die-cast aluminium frame, and Hertz's proprietary AIR (Air Intercooling Revolution) technology to manage thermal load and maintain performance under sustained high-output use.

Features & Benefits

Ultra-Shallow Sealed Enclosure Optimised for MPS 250 S2: The MPBX 250 S2 is not a universal enclosure but a purpose-engineered sealed box designed specifically around the MPS 250 S2 driver's Thiele-Small parameters, ensuring the acoustic load presented to the driver is precisely matched for optimal frequency response, damping, and power handling.

15mm Wood Construction with Internal Bracing: The 15mm (0.59") wood panels provide structural robustness well above entry-level enclosures, while panel-to-panel internal bracing with solid corners eliminates flex and resonance under high-output conditions. Round external corners ease placement in confined boot and under-seat locations.

Internal Sound-Absorbing Material: Acoustic fill material lining the interior of the enclosure virtually increases the effective box volume, extending low-frequency response beyond what the physical dimensions alone would suggest, and reducing internal resonances that can colour the subwoofer's output.

2S2 (2 Sides/2 Sounds) Dual-Firing Orientation: The enclosure supports both Down-Firing and Up-Firing installation. Down-Firing mode, using the included levelling feet, increases low-frequency extension for deep, powerful bass. Up-Firing mode provides increased punch and transient definition. The choice allows the system to be tuned to the installation environment and listener preference without additional hardware.

SSP (Sub Smart Plug) Terminal System: The SSP system combines a Plug-and-Play terminal block for fast, secure, quick-release wiring with traditional push terminals for conventional cable termination. Both methods are available simultaneously, providing installation flexibility and a bulletproof electrical connection under vibration.

AIR (Air Intercooling Revolution) Technology: Hertz's proprietary AIR system optimises fluid dynamics within the voice coil inner chamber and magnetic group to minimise internal air compression and maximise cooling capacity. This allows the MPS 250 S2 driver to sustain high power levels without thermal compression degrading output.

Six-Layer Copper Voice Coil: The 38mm (1.5") six-layer copper voice coil provides high thermal mass and current-handling capacity, contributing to the driver's 500W continuous power rating and its ability to sustain output under prolonged high-demand listening conditions.

Die-Cast Aluminium Frame: The MPS 250 S2 driver uses a die-cast aluminium frame for dimensional precision and rigidity, maintaining consistent spider and surround geometry across the full range of mechanical excursion.

Unrivalled Mechanical Excursion (Xmech 20mm): The MPS 250 S2 achieves 20mm of mechanical excursion, representing a 20% improvement over traditional designs of equivalent size, enabling higher output and lower distortion at the frequency extremes from a shallow-mount driver.

eID (Elettromedia Identification): The eID code linked to each unit allows the user to scan and verify product authenticity, destination market specifications, and registration information through the Hertz web platform.

Included Accessories: A screw-less mesh grille with adjustable logo position suitable for reverse install, levelling feet with velcro inserts for Down-Firing orientation, and the SSP Plug-and-Play terminal block are all provided in the box.

Technical Specs

What's in the Box

• 1x MPBX 250 S2 Sealed Enclosure with MPS 250 S2 Subwoofer Installed
• Screw-less mesh grille with adjustable logo position
• Levelling feet with velcro inserts
• SSP Plug-and-Play terminal block

Goes Well With

The MPBX 250 S2 operates at 2 ohms and handles 500 watts continuous, making it well matched to a monoblock amplifier in the 250-500 watt RMS range at 2 ohms. For installations requiring both subwoofer and speaker amplification, the MPBX 250 S2 can be driven from one channel of a bridgeable 4-channel amplifier or from a dedicated monoblock paired with a separate speaker amplifier. A quality 4-gauge or 8-gauge amplifier wiring kit is recommended depending on the amplifier's total power draw. RCA interconnects from the head unit's subwoofer pre-out are the recommended signal source connection.

Frequently Asked Questions

What is the difference between Down-Firing and Up-Firing installation, and which should I choose?

Down-Firing installation orients the subwoofer cone facing the floor, using the included levelling feet to raise the enclosure and allow airflow. This orientation tends to increase low-frequency extension, producing deeper, more powerful bass. Up-Firing installation orients the cone facing upward toward the cabin, which typically produces more punch and transient definition. The best choice depends on the vehicle's acoustic characteristics and the listener's preference. Both orientations are supported by the included hardware.

Is the MPS 250 S2 subwoofer included in the MPBX 250 S2 enclosure, or is it sold separately?

The MPBX 250 S2 is an optimised package that includes the MPS 250 S2 driver pre-installed in the matched sealed enclosure. It is not an empty enclosure. The two are engineered together as a system, and the acoustic performance specifications apply to the driver and enclosure as a combined unit.

What does AIR (Air Intercooling Revolution) technology do?

AIR is Hertz's proprietary thermal management system for the voice coil and magnetic assembly. It optimises the fluid dynamics within the voice coil inner chamber to minimise the compression of air that builds up during high-excursion operation, which would otherwise limit the driver's output and accelerate thermal stress on the coil. By maximising cooling capacity through improved airflow, AIR allows the MPS 250 S2 to sustain high power output levels without thermal compression degrading performance during prolonged listening sessions.

What does the SSP terminal system provide, and why does it matter?

SSP stands for Sub Smart Plug. The system provides two connection methods simultaneously on the same enclosure: a Plug-and-Play terminal block that accepts a quick-release connector for fast, secure wiring during installation or removal, and traditional push terminals for conventional bare speaker wire termination. This dual-method approach allows the installer to choose the connection style that suits the installation, and the quick-release capability makes the enclosure easy to remove temporarily without disturbing the permanent wiring.

What does the eID system do?

eID (Elettromedia Identification) is Hertz's product traceability system. Each unit carries a code linked to its destination country and market, which can be scanned by the user to verify product authenticity, check product specifications, and access the registration page via the Hertz web platform. It provides assurance that the product is a genuine Hertz unit matched to the correct regional specification.