STX Audio SX502 5.25" 3-Way Coaxial Car Speakers

The STX Audio SX502 is a matched pair of 5.25-inch 3-way coaxial car speakers for compatible factory door and rear-deck locations. It provides a practical replacement path for worn original speakers while retaining a compact, single-location installation. The pair is designed for use with compatible factory or aftermarket car audio systems.

Each speaker combines a woofer, bridge-mounted midrange driver, and bridge-mounted tweeter in one coaxial assembly. This three-driver layout is intended to reproduce bass, vocal detail, and high-frequency information from a single speaker location. It is suited to listeners refreshing a factory system or building a balanced Street Series setup.

The SX502 is rated for 120 watts RMS per pair and 450 watts maximum per pair, with a 4-ohm nominal impedance. Its 88 dB sensitivity and 85 Hz to 22 kHz frequency response support clear midrange and upper-frequency playback. Use a compatible head unit or amplifier that delivers clean power within the speaker's stated RMS rating.

STX Audio builds the SX502 with black injection-molded woofer cones and rubber edge surrounds for controlled cone movement. A 1-inch aluminum voice coil and 12-ounce magnet form part of the motor assembly. The black steel basket provides a rigid mounting foundation for everyday in-vehicle use.

These round speakers are intended for compatible 5.25-inch mounting positions, but nominal size alone does not confirm vehicle fitment. Check the factory opening, mounting depth, screw pattern, connector style, and clearance before installation. Two matching protective grilles with gold accents are included for installations where the speaker faces are exposed.

Key Features

• 3-Way Coaxial Layout: Woofer, midrange, and tweeter share one mounting location.
• 5.25-Inch Round Size: Fits compatible compact door or rear-deck locations.
• 120W RMS Per Pair: Supports 60 watts RMS per speaker.
• 4-Ohm Nominal Impedance: Works with compatible car audio equipment.
• Injection-Molded Woofer Cones: Help provide controlled everyday playback.
• Included Protective Grilles: Two gold-accented grilles finish exposed installations.

Design & Installation

The SX502 uses black injection-molded woofer cones, rubber edge surrounds, aluminum voice coils, 12-ounce magnets, and black steel baskets. These materials create a compact full-range speaker assembly for automotive use. The included grilles continue the black Street Series appearance with gold accents.

Install the SX502 only where a 5.25-inch round speaker can be mounted with sufficient behind-panel clearance. Confirm mounting-hole alignment, mounting depth, wiring polarity, and factory connector compatibility before beginning; vehicle-specific adapters may be required. Connect each speaker to a compatible 4-ohm-capable source or amplifier and avoid clipping or excessive power.