Hertz CS 250 S2 10" 2-Ohm Component Subwoofer

The Hertz CS 250 S2 is a 10-inch component car subwoofer designed to add low-frequency output to a custom vehicle audio system. Its single 2-ohm voice coil configuration is intended for use with an external subwoofer amplifier. The driver is engineered for installations where enclosure space is limited.

It is a practical choice for listeners building a compact bass upgrade in a trunk, cargo area, or under-seat-style custom enclosure where fitment allows. Hertz specifies enclosure designs beginning at 16 liters for this model. That compact-box focus helps simplify integration into systems that cannot accommodate a large subwoofer enclosure.

The CS 250 S2 handles 300 watts continuous power and 600 watts peak power. Its 2-ohm nominal impedance can be matched with an amplifier that is stable at 2 ohms. The 84 dB SPL sensitivity and 30 Hz resonance frequency provide useful design information when selecting amplification and enclosure parameters.

Hertz uses a polypropylene cone and a shaped dust cap developed through FEM simulation to help reduce low-frequency distortion. The 35 mm voice coil uses six layers of pure copper wire on a high-thermal-resistance glass-fiber support. Its magnetic-group geometry and airflow-focused design are intended to support controlled operation at higher excursion levels.

This subwoofer fits naturally into a system with a dedicated mono amplifier, low-pass filtering, and a properly built sealed enclosure. The manufacturer publishes a 16-liter sealed-box design with a 231 mm mounting hole. Solid push terminals accept speaker cable up to 8 AWG for straightforward connection in single- or multi-subwoofer installations.

Key Features

• 300W Continuous Power: Supports amplifier matching around its 300-watt RMS rating.
• Single 2-Ohm Voice Coil: Provides a 2-ohm nominal load for compatible amplifiers.
• Compact Sealed-Box Design: Optimized for sealed enclosures starting at 16 liters.
• Polypropylene Cone: Uses a durable cone material for low-frequency reproduction.
• Six-Layer Copper Voice Coil: Helps manage thermal demands during sustained operation.
• 8 AWG Push Terminals: Accepts substantial speaker wire for secure amplifier connections.

Design & Installation

The CS 250 S2 combines a polypropylene cone with a high-density-flux ferrite magnet and rubber protection around the magnetic assembly. Its 35 mm voice coil is wound on a glass-fiber support, while the high-strength ABS gasket is designed to accommodate the optional grille. The driver has a 270 mm overall diameter and a 115 mm mounting depth.

Plan for a 231 mm mounting cutout and at least 115 mm of mounting-depth clearance behind the mounting surface. Hertz publishes a 16-liter sealed enclosure with 19 mm wood, 385 x 385 x 180 mm external dimensions, and damping material on the rear panel. Match it to an amplifier rated for a 2-ohm load, and use the published 15 Hz subsonic and 70-80 Hz low-pass filter guidance for that sealed-box design.