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Infinity Primus 603F

Primus Series 6-1/2" 2-way car speakers

Item # 108P603F

Infinity knows what music should sound like in the car, and their Primus 603F 6-1/2" 2-way...

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Infinity knows what music should sound like in the car, and their Primus 603F 6-1/2" 2-way...

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Item # 108P603F

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Car-specific installation packages

Deep discounts on the essential accessories that help your new gear work with your car.

Since 1974

Years of experience making people happy.

About the Infinity Primus 603F

Alexander H.

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.

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.

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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:

  • 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

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More details on the Infinity Primus 603F

Pat M.

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
The Infinity Primus 603F replaces these items:

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.

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