Infinity PR603F 6.5" 2-Way Car Speakers

The Infinity PR603F is a pair of 6-1/2-inch, 2-way car speakers designed for replacing compatible factory speakers or building a straightforward audio upgrade. Each speaker combines a polypropylene woofer with a 1/2-inch silk-dome tweeter in one assembly. They are suited to listeners who want a compact, full-range speaker option for front or rear vehicle locations where fitment permits.

The PR603F is rated for 50 watts RMS and 150 watts peak power per speaker, with a 3-ohm nominal impedance. Its 92 dB sensitivity rating is measured at 2.83V/1m, and its stated frequency response is 55 Hz to 20 kHz at -6 dB. These specifications make it important to match the speakers with a compatible factory radio or amplifier and to verify vehicle-specific fitment before installation.

Infinity uses a Plus One™ polypropylene woofer cone architecture that increases usable cone area compared with conventional cones in its class. More cone area can support greater low-frequency output and sensitivity from the available mounting footprint. The 1/2-inch edge-driven silk-dome tweeter handles upper frequencies, with a specified crossover point of 5 kHz at 6 dB per octave.

A vented basket frame is used to help move heat away from the voice-coil area during operation. The speaker frame is designed to remain rigid while providing ventilation around the motor structure. This construction supports consistent operation when the speakers are driven within their rated power range.

The PR603F is a practical option for a vehicle speaker refresh using a 6-1/2-inch mounting location, subject to confirmation of mounting diameter, depth, wiring, and panel clearance. The package includes basic mounting hardware, foam gaskets, and short pigtail cables for installation. For a complete upgrade, pair the speakers with compatible vehicle-specific adapters or harnesses when required and set amplifier gain conservatively for the 50-watt RMS rating per speaker.

Key Features

• 6-1/2-Inch 2-Way Design: Combines woofer and tweeter functions in each speaker.
• Plus One™ Woofer Cone: Provides increased cone area within its class.
• Polypropylene Woofer: Uses a 6-1/2-inch polypropylene driver for midrange and bass duties.
• Silk-Dome Tweeter: A 1/2-inch edge-driven tweeter covers high frequencies.
• Vented Basket Frame: Helps dissipate heat around the voice-coil area.
• Installation Hardware Included: Includes screws, speed clips, gaskets, and pigtail cables.

Design & Installation

The PR603F uses a black multi-element speaker design with a polypropylene woofer, edge-driven silk-dome tweeter, and vented basket frame. Infinity's Plus One™ cone architecture is intended to maximize cone area within the speaker's available size. The compact speaker design is intended to accommodate more vehicle locations without unnecessary cutting where fitment allows.

Confirm the vehicle's speaker opening, mounting depth, mounting-hole pattern, and connector requirements before ordering. Use the supplied foam gasket to help seal the speaker to the mounting surface, and use the supplied screws and speed clips where appropriate. The included 18 AWG pigtail cables may assist with wiring, but vehicle-specific harnesses, adapters, or additional installation parts may still be needed.