Infinity Primus 503CF 5.25" 2-Way Component Speakers

Infinity Primus 503CF 5.25" 2-Way Component Speakers are a purpose-built car audio component system designed for enthusiasts who demand clear vocals, precise highs, and solid bass with efficient power use.

• 5-1/4" Plus One+ polypropylene woofer cone: Plus One+ design extends the cone to the edge of the basket, increasing surface area for stronger bass and deeper low end, paired with a hi-roll rubber surround for controlled excursion.
• 3/4" edge-driven silk dome tweeter: An edge-driven design delivers an open, detailed high end with reduced distortion even at higher volumes, helping cymbals and vocals stay clean.
• 3-ohm impedance: Lower impedance supports drawing more power from a head unit or amplifier, compatible with virtually all factory or aftermarket car stereos.
• Power handling: Handles up to 50 watts RMS (150 watts peak), providing ample headroom for common factory and aftermarket systems without stressing the components.
• Frequency response: 75–20,000 Hz coverage ensures both bass fundamentals and high-frequency detail are reproduced in a typical vehicle listening environment.
• Sensitivity: 91 dB at 2.83 volts, indicating relatively high efficiency so more output can be achieved from the same power input.
• Cooling vented basket frame: Ventilated basket design aids heat dissipation, supporting sustained output and longevity under demanding listening.
• External crossovers included: Crossovers tuned to Infinity standards ensure proper frequency separation and cohesive system integration.
• Grilles not included: Factory grilles should be suitable for most applications, simplifying installation in many vehicles.
• What’s in the box: Infinity Primus 503CF owner’s manual; 2 woofers; 2 tweeters (each with attached leads and quick-slides); two 18" tweeter wires with in-line crossovers; multiple mounting hardware including cups, nuts, screws, speed clips, foam gaskets, and installation template.

Benefits: In a typical car build, the Primus 503CF pair delivers a clearly defined soundstage with vocal clarity and crisp cymbals, while the Plus One+ woofer cone provides stronger bass response without requiring extreme head-unit power. The edge-driven tweeters maintain detail at higher listening levels, and the included crossovers ensure accurate frequency division for a true two-way component setup. Built for a wide range of vehicles, this system improves over stock acoustics through efficient power handling and reliable thermal management.