About the Infinity Primus 603F

Primus does you right
Primus does you right
Infinity knows what music should sound like in the car, and their Primus 603F 6-1/2" 2-way speakers fit more vehicles than ever. Plus, new technology, like Infinity's cooling vented basket frame, ensures maximum output with less wear and tear over the life of these speakers.
Ditch the uninspired vocals, muddy cymbals, and flabby bass of your factory sound and experience what Infinity quality is all about. Smooth vocals, crisp cymbals, and rich bass await you.
Edge-driven tweeter design
Infinity employs an edge-driven design for an open sound and minimal distortion at high volume. Prepare for a more clearly defined soundstage as the natural details in your music come alive.
Famous Plus One+ technology
The Primus polypropylene woofer employs Infinity's proprietary Plus One woofer design for solid, punchy bass. Infinity extends the cone right up to the edge of the basket, for more surface area — and a bigger cone means more bass when your music needs it.
Make the most of your power
Infinity's special "true 4-ohm architecture" uses a low-impedance voice coil to safely draw extra power out of your factory radio, aftermarket stereo, or an external amplifier, so you'll get a stronger and clearer sound.
Product highlights:
- 6-1/2" 2-way car speakers
- Plus One+ polypropylene woofer cone with hi-roll rubber surround
- 1/2" edge-driven silk dome tweeter
- 3-ohm impedance for extra power (compatible with virtually all factory or aftermarket car stereos)
- handles up to 50 watts RMS (150 watts peak power)
- frequency response: 55-20,000 Hz
- sensitivity: 92 dB at 2.83 volts
- grilles not included
- warranty: 1 year
- MFR # INFSPKPR603C
What's in the box:
Infinity Primus 603F owner's manual
- Two 2-way speakers
- Two 8" Lengths of speaker wire (each has 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
Reviews (6)
Customer reviews for Infinity Primus 603F
Loading reviews...
Average review:
4.5 out of 5 starsThanks for submitting your review
Customer photos
This review was collected as part of a promotion
Pros:
Cons:
More details on the Infinity Primus 603F

Features & specs
General | ||
---|---|---|
Speaker Size | 6 1/2 | |
Design | 2-way | |
Tweeter Design | Edge-driven dome | |
Impedance (Ohms) | 3 | |
Tweeter Composition | Silk | |
Woofer Composition | Polypropylene | |
Woofer Surround | Rubber | |
Parts Warranty | 1 Year | |
Labor Warranty | 1 Year | |
Specifications | ||
Sensitivity (1W at 1 meter) | N/A | |
Sensitivity at 2.83 volts | 92 | |
Frequency Response | 55 - 20k Hz | |
Minimum RMS Wattage | --- | |
Maximum RMS Wattage | 50 | |
Peak Power Handling (Watts) | 150 | |
Top-mount Depth (Inches) | 1 15/16 | |
Bottom-mount Depth (Inches) | N/A | |
Cutout Diameter or Length (inches) | 5 1/16 | |
Mounting Height (Inches) | 0.6 |
Product Research
Features
Plus One Woofer Cones: The Plus One speaker cones offer more surface area than many other speakers that fit in the same size opening. This is accomplished by using a new basket design and hi-roll surround. The result is greater bass output and an increase in efficiency.
Mounting: Infinity markets these speakers as having a 6½" woofer, and they will fit in standard 6½" speaker openings (approximately 5" diameter), but they do not use the standard 6½" speaker bolt pattern. The woofers are also easily installed in many standard 4-hole 6¾" applications with no modification. Please enter your vehicle information to confirm fit.
Voice Coil: The Primus Series speakers feature 3-ohm voice coils to compensate for the high in-line resistance of small gauge factory wiring. They extract every watt from the factory receiver, increasing overall system output and efficiency (relative to 4-ohm speakers). The speakers also benefit from increased power when you upgrade the wire and add aftermarket amplifiers capable of powering a lower impedance load.
Loading accessories...
Customer Q&A
Loading articles...
Solid upgrade from 5.25" factory rear door speakers to 6.5" infinity's. Solid sound upgrade with clarity - very happy. Easy install - harnesses supplies worked perfect
Kevin from Greensboro , NC