{"product_id":"soundxtreme-st-503-5-25-3-way-coaxial-speakers","title":"SoundXtreme ST-503 5.25\" 3-Way Coaxial Speakers","description":"\u003cp\u003eThe SoundXtreme ST-503 is a pair of 5.25-inch, 3-way coaxial car speakers intended as a replacement for factory-installed speakers. It provides a compact option for vehicles that use 5.25-inch speaker locations. The full-range coaxial layout keeps the woofer and high-frequency drivers together in each speaker assembly.\u003c\/p\u003e\u003cp\u003eThis set is suited to listeners looking to refresh an aging factory speaker system or build a basic replacement system around a compatible head unit or amplifier. Its 4-ohm impedance is the common nominal load used by many car-audio systems. Confirm the vehicle's opening size, mounting depth, and connector arrangement before ordering.\u003c\/p\u003e\u003cp\u003eThe ST-503 uses a 3-way design, combining a woofer section with integrated midrange and high-frequency reproduction. This arrangement is designed to cover a broad portion of the audible range from each mounting location. The published frequency response is 100 Hz to 20 kHz, so low bass below that range is better handled by a dedicated subwoofer when deeper bass is desired.\u003c\/p\u003e\u003cp\u003eA polypropylene mid-woofer cone and PEI dome tweeter are specified for the speaker system. The listed 20 mm voice coil and 5.3-ounce magnet are part of its compact coaxial construction. With an 88 dB sensitivity rating, output will depend on the source unit or amplifier power, installation quality, and vehicle acoustics.\u003c\/p\u003e\u003cp\u003eRated for 320 watts peak power, the ST-503 is intended for everyday replacement-speaker use rather than as a standalone bass solution. It can be used with a factory radio or an aftermarket system that is compatible with 4-ohm speakers. For a balanced upgrade, pair it with clean amplification and properly fitted mounting hardware.\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5.25-Inch Size:\u003c\/strong\u003e Fits applications designed for compact round speakers.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-Way Coaxial Layout:\u003c\/strong\u003e Integrates multiple driver elements in each speaker.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-Ohm Impedance:\u003c\/strong\u003e Supports common factory and aftermarket car-audio systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e320W Peak Rating:\u003c\/strong\u003e Provides the published peak power-handling specification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePEI Dome Tweeter:\u003c\/strong\u003e Handles high-frequency reproduction within the coaxial design.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e2.5-Inch Mounting Depth:\u003c\/strong\u003e Helps with fitment planning behind the mounting surface.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eDesign \u0026amp; Installation\u003c\/h3\u003e\u003cp\u003eThe ST-503 uses a polypropylene mid-woofer cone, PEI dome tweeter, 20 mm voice coil, and 5.3-ounce magnet. Its full-range 3-way coaxial construction combines the driver elements in a single round speaker assembly. The listed outside diameter is 5.25 inches.\u003c\/p\u003e\u003cp\u003eCheck that the vehicle accepts a 5.25-inch round speaker and has at least 2.5 inches of mounting clearance before installation. Verify factory mounting-hole alignment, terminal connection type, and any required adapters separately, as fitment hardware is vehicle-specific. Use two matching speakers as a left\/right pair and observe correct positive and negative polarity when wiring.\u003c\/p\u003e","brand":"SoundXtreme","offers":[{"title":"Default Title","offer_id":45613243301958,"sku":"ST-503","price":30.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0048\/4163\/5910\/files\/81OXZUIcUdL.jpg?v=1784350558","url":"https:\/\/audiowatt.store\/products\/soundxtreme-st-503-5-25-3-way-coaxial-speakers","provider":"Audio Watt Store","version":"1.0","type":"link"}