The
Infinity Primus PR503CF is
a high-efficiency 5-1/4" (5.25") two-way component car speaker system designed to bring accurate, lifelike vocals and sharp detailing to compact factory speaker locations.
As a component system, it separates the mid-bass woofers from the tweeters using external crossovers to optimize sound staging and clarity.
Technical Specifications
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Power Handling: 50 Watts RMS (150 Watts Peak per speaker)
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Impedance: 3-Ohm (True Four Ohm architecture safely pulls extra power from factory or aftermarket head units)
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Frequency Response: 75 Hz – 20,000 Hz
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Sensitivity: 91 dB at 2.83V
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Woofer Mounting Depth: 1.81" (1-13/16")
Key Features
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Plus One+ Woofer Cones: Patented polypropylene cone design provides up to 35% more surface area than competitors, boosting bass punch and efficiency.
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Edge-Driven Silk Dome Tweeters: The 3/4" silk tweeters deliver smooth, non-fatiguing high frequencies and expanded detail without distortion at high volumes.
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Super-Rigid Vented Baskets: Designed to cool the voice coils by wicking heat away during heavy use, ensuring long-term reliability.
- Starfish™ Tweeter Mounts: Includes flexible installation hardware designed for simple flush or surface mounting in factory tweeter spots.
Audio Performance
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RMS Power Handling: 50 Watts
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Peak Power Handling: 150 Watts
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Frequency Response: 75 Hz – 20,000 Hz
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Sensitivity: 91 dB at 2.83V
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Impedance: 3-Ohm True Four Ohm technology
Driver & Material Details
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Speaker Design: 2-Way Component System
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Woofer Size: 5-1/4" (5.25")
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Woofer Composition: Plus One+ Polypropylene
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Woofer Surround: Hi-Roll Rubber
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Tweeter Size: 3/4"
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Tweeter Design: Edge-driven dome
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Tweeter Composition: Silk
Physical Dimensions
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Woofer Top-Mount Depth: 1.812" (1-13/16")
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Woofer Bottom-Mount Depth: 2-1/16"
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Cutout Diameter: 4.687" (4-11/16")
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Mounting Height: 0.44"
System Features
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Crossover: Includes inline passive crossover networks
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Tweeter Level Control: Fixed (Standard attenuation handled via inline network)
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Tweeter Brackets: Starfish™ factory mounting adapters included
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