{"product_id":"infinity-primus-503f-5-25-coaxial-speakers","title":"Infinity Primus 503F 5.25\" Coaxial Speakers","description":"\u003cdiv\u003e\n\u003cp\u003eInfinity Primus 503F 5.25\" coaxial speakers deliver tighter bass and clearer highs in a compact 5-1\/4\" package. Built for car-audio enthusiasts upgrading factory or aftermarket systems, these speakers fit more vehicles than ever and pair Plus One+ bass with edge-driven tweeters for a defined soundstage.\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003e5-1\/4\" 2-way coaxial design\u003c\/b\u003e: compact footprint that fits common factory openings while delivering two‑way sound for improved imaging versus a single‑driver setup.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePlus One+ polypropylene woofer cone with hi-roll rubber surround\u003c\/b\u003e: larger effective cone area increases bass extension and control for punchier low end in tight spaces.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e3\/4\" edge-driven silk dome tweeter\u003c\/b\u003e: smooth high frequencies with reduced distortion at higher listening levels, helping cymbals and vocals stay crisp.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003e3-ohm impedance\u003c\/b\u003e: enables stronger power delivery from most head units or amplifiers, boosting perceived output in a wide range of systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTrue 4-ohm architecture\u003c\/b\u003e: low-impedance voice coil designed to safely draw power from your source, delivering a stronger and clearer sound.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePower handling\u003c\/b\u003e: supports up to 40 W RMS (120 W peak), aligning with common head-unit and small-amp configurations for clean dynamics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eFrequency response\u003c\/b\u003e: 75–20,000 Hz covers essential vocal to treble content for balanced playback.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eSensitivity\u003c\/b\u003e: 91 dB @ 2.83V; higher sensitivity means more output from the same amplifier power in typical car audio setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCooling vented basket frame\u003c\/b\u003e: assists heat dissipation during extended use, helping maintain performance over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGrilles\u003c\/b\u003e: grilles not included.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWarranty\u003c\/b\u003e: 1 year.\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWhat’s in the box\u003c\/b\u003e: Infinity Primus 503F owner's manual; two 2-way speakers; two 9\" lengths of speaker wire (each with female quick-slides on one end and tinned wire on the other); eight 1\" screws; 8 speed clips; 2 adhesive-backed foam gaskets; template and specs on box.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Primus 503F is designed to upgrade factory systems or compact aftermarket builds, delivering stronger output from your source thanks to its 3-ohm impedance and true 4-ohm architecture. The Plus One+ woofer cone provides more bass surface area for tighter, more controlled low end, while the edge-driven tweeter maintains clarity at higher volumes. The cooling vented basket frame supports sustained performance and longevity, making this pair a practical step up for enthusiasts seeking real, measurable improvements without oversized enclosures.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Infinity","offers":[{"title":"Default Title","offer_id":49850260160740,"sku":null,"price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0842\/2522\/9028\/files\/g108P503F-F.jpg?v=1789262117","url":"https:\/\/www.12voltoutlet.com\/products\/infinity-primus-503f-5-25-coaxial-speakers","provider":"12 Volt Outlet","version":"1.0","type":"link"}