STX Audio SX402 4" 2-Way Coaxial Car Speakers

The STX Audio SX402 is a pair of 4-inch, 2-way coaxial car speakers made for compact factory-speaker replacement locations. It combines midrange and high-frequency drivers into each speaker, providing a straightforward way to refresh worn or limited factory audio. The 4-ohm design is intended to work with compatible factory or aftermarket car-audio systems.

This Street Series pair is suited to listeners upgrading smaller speaker positions in doors, dashboards, or rear decks. Its compact 4-inch format can be useful where a larger speaker cannot be installed. Vehicle-specific fitment should still be confirmed before purchase because mounting depth and cutout measurements are not provided.

With 80 watts RMS power handling per pair and 350 watts maximum power handling per pair, the SX402 is designed for systems that need a compact coaxial speaker upgrade. The 88 dB sensitivity supports operation with compatible head units and amplification. Match the speakers with an amplifier or receiver that is stable at 4 ohms and appropriately powered.

A black injection-molded cone and rubber edge surround are used to support controlled cone movement. The specified 85 Hz to 22 kHz frequency response covers core midrange and high-frequency musical information for a small coaxial speaker. For deeper low bass, a dedicated subwoofer system may be considered where the vehicle and system design allow it.

Each speaker uses a 1-inch aluminum voice coil and a 10-ounce magnet structure. Black steel baskets provide the mounting framework, while the included matching grilles use gold accents for a coordinated Street Series appearance. The package is intended as a two-speaker set for a single pair of vehicle speaker locations.

Key Features

• 4-Inch Coaxial Design: Combines midrange and high-frequency reproduction in a compact speaker format.
• 4-Ohm Impedance: Works with compatible factory and aftermarket car-audio systems.
• 80W RMS Per Pair: Provides stated continuous power handling for the included pair.
• Injection-Molded Cones: Supports controlled cone movement for everyday music playback.
• Rubber Edge Surrounds: Helps support cone travel and midbass response.
• Included Matching Grilles: Adds protection and a coordinated gold-accented appearance.

Design & Installation

The SX402 uses black injection-molded cones, rubber edge surrounds, 1-inch aluminum voice coils, and 10-ounce magnet structures. Its black steel baskets form the speaker mounting structure, and the pair includes matching grilles with gold accents. This combination is designed around a compact Street Series coaxial-speaker format.

Use the SX402 where a vehicle accepts a 4-inch speaker, such as selected door, dashboard, or rear-deck locations. Confirm the vehicle's mounting opening, mounting depth, screw pattern, available clearance, and wiring connection before installation, as those measurements are not confirmed in the available product data. Install the pair on a compatible 4-ohm factory or aftermarket audio system and observe the system's power limits.