STX Audio SX402 4" 3-Way Coaxial Car Speakers

The STX Audio SX402 is a pair of 4-inch 3-way coaxial car speakers designed for compact factory speaker locations. It provides an upgrade option for compatible door, dashboard, and rear-deck positions where space is limited. The pair uses a 4-ohm design for use with compatible factory radios and aftermarket car-audio systems.

Each SX402 combines a woofer with bridge-mounted midrange and tweeter drivers in one coaxial assembly. This layout is intended to cover low, midrange, and high-frequency duties from a single 4-inch mounting location. It is a practical choice for listeners replacing worn factory speakers without adding separate component drivers.

The speaker pair is rated for 80 watts RMS combined and up to 350 watts maximum combined. Its 88 dB sensitivity supports use with compatible low- to moderate-power systems. The specified 85 Hz to 22 kHz frequency response is suited to the midbass, vocal, and treble range expected from compact vehicle speakers.

Construction includes black injection-molded woofer cones with rubber edge surrounds for controlled cone movement. Each speaker uses a 1-inch aluminum voice coil, 10-ounce magnet structure, and black steel basket. These materials provide a rigid foundation for the driver assembly in everyday automotive use.

The SX402 set is suited to a straightforward full-range speaker refresh or as part of a broader vehicle audio upgrade. Matching black grilles with gold accents are included for installations where the speakers are exposed. Confirm the vehicle's opening size, mounting depth, screw pattern, and terminal clearance before installation.

Key Features

• 3-Way Coaxial Layout: Integrates woofer, midrange, and tweeter drivers in each speaker.
• 4-Inch Size: Fits compatible compact factory speaker locations.
• 80W RMS Per Pair: Provides a continuous-power reference for system matching.
• 4-Ohm Impedance: Works with compatible factory and aftermarket audio systems.
• Rubber Edge Surround: Helps support controlled cone movement during playback.
• Matching Grilles Included: Adds protection and a coordinated installed appearance.

Design & Installation

The SX402 uses black injection-molded cones, rubber edge surrounds, aluminum voice coils, 10-ounce magnets, and black steel baskets. The supplied black grilles include gold accents for a coordinated Street Series appearance. Its compact coaxial construction places all three driver elements within each 4-inch speaker assembly.

Verify fitment before purchase by comparing the factory opening, mounting depth, mounting-hole pattern, and terminal clearance with the vehicle location. Observe correct speaker polarity and use secure mounting hardware appropriate for the application. Match the pair with equipment designed to operate safely at 4 ohms, and avoid audible distortion during setup.