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Infinity Primus PR9603is

6"x9" 3-way car speaker

Item #: 108P9603IS

In Stock

16 Reviews | 1 question - 1 answer

Installation gear for most cars

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Infinity Primus PR9603is

Enjoy your music again 

Vehicle manufacturers don't put much thought into stock stereo systems, and it shows. Uninspired vocals, muddy cymbals, and flabby bass are dead giveaways that you've still got stock speakers. Install a set of Infinity's Primus PR9603is 6"x9" speakers in your car and you'll notice a world of difference. Lifelike vocals, crisp cymbals, and well-defined bass await you, and cruising around town will be more enjoyable as you get pulled into your favorite tunes.

Built with home audio know-how

Infinity used technology from their popular Primus home speakers to design car speakers that offer strong performance without breaking the bank. A 1" edge-driven, textile dome tweeter and a 5/9" piezo supertweeter broadcast smooth high frequencies while the oversized, Plus One+ polypropylene woofer creates solid bass. The speakers' 3-ohm impedance safely draws a little extra power out of your factory radio, aftermarket stereo, or an external amplifier, so you'll get a little more punch from your system. Grilles are included.

Product Highlights:

  • 6"x9" 3-way speakers (pair)
  • Plus One+ polypropylene woofer cone with hi-roll rubber surround
  • 1" edge-driven textile dome tweeter and 5/9" piezo supertweeter
  • 3-ohm impedance for extra power (compatible with virtually all factory or aftermarket car stereos)
  • power range: 5-90 watts RMS (360 watts peak power)
  • frequency response: 46-22,000 Hz
  • sensitivity: 94 dB
  • top-mount depth: 2-3/4"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Why replace your car's original speakers?

The speakers that originally came in your car were made from inexpensive materials, designed to create acceptable sound at the lowest possible cost to the manufacturer. If you love music, you deserve better. Name-brand aftermarket speakers deliver fuller, richer sound with considerably more detail and nuance, and they're capable of playing louder and cleaner than factory speakers. Connect new speakers to your factory radio and you'll get the best possible sound from your dealer-equipped system. Pair them up with a new car stereo for a level of enjoyment that can rival a high-fidelity home audio experience.

Infinity Primus PR9603is Reviews

Average Customer Review:

16 Reviews

infinity primus speakers

Written by: Bob from Maryland on January 3, 2016

1967 Chevrolet Camaro
Crutchfield Customer Review (What's this?)

Good sound quality. nice range

Pros: good product at a value price


Infinity Primus PR9603is

Written by: Daryl from Puerto Rico on August 1, 2015

Crutchfield Customer Review (What's this?)

Excellent sound details, easy to mount, the price is worth it.You won't be disapointed.


Cons: none


Written by: DVCounts from Denton, TX on July 23, 2015

2009 Dodge Ram 1500
Crutchfield Customer Review (What's this?)

Great sounding speakers. The mounting bracket fit perfectly behind the speaker and made it flush with the door mount.

Pros: Great sound. Easy mount.

Cons: None.

They Rock

Written by: Pigpen from New York on June 26, 2015

1992 Dodge B Series
Crutchfield Customer Review (What's this?)

You will not be disappointed. I bought the matching midrange and tweeters. These really fill the cavernous space of my B-150 "Mystery Machine".

Pros: Excellent, Excellent, Excellent!

Cons: None

primus 6x9

Written by: jw from Arkansas on May 19, 2015

1992 Toyota Pickup
Crutchfield Customer Review (What's this?)

Good sound quality, nice they came with grills

Pros: They sound great.

Cons: wish they had a bit more in the low tones.

To Infinity & Beyond !

Written by: Craig from Pflugerville, Texas on May 17, 2015

The name says it all...Infinity...look no further! Experience sound & detail. Your ears will be overwhelmed with beautiful music.

Pros: Beautiful from the inside out.

Cons: They don't install themselves!

Great Speakers

Written by: Steve E from Florida on May 11, 2015

Crutchfield Customer Review (What's this?)

These are mounted in the doors of a Dodge Ram 1500, replaced some Pioneer 6 x 9s that sounded pretty good-- these are better, a lot clearer sound. I also have Infinity component speakers & a Pioneer 10" sub behind the seat, now I can hear things in songs that I didn't notice before. when cranked up, it sounds awesome !

Pros: They come with plastic spacers that go under the speaker, to bring the magnet out away from the window when its rolled down. I probably would have had to make some, so I'm glad they were included

Cons: none

Great sound

Written by: Anonymous from Mesa Arizona on April 14, 2015

2013 Dodge Avenger
Crutchfield Customer Review (What's this?)

Speakers sound great, very little distortion. Even at high levels sound is great. Puts out great mid and tweet. Excellent product!!



Great sound and quality

Written by: JetemyD from Kansas on April 6, 2015

2013 Toyota Tundra
Crutchfield Customer Review (What's this?)

Great sound quality,not overly deep magnet,sound great being power by alpine mini amp, if I needed to use the cover screens looked very clean and sleek.



Great speakers

Written by: Ray W from Los Angeles on March 23, 2015

Crutchfield Customer Review (What's this?)

Great sounding speakers. Crisp highs great bottom end. I put these in the doors of my truck and with such great bass response, I was able to eliminate my cumbersome subwoofer and amp.




Written by: Testy Tim from Omaha, NE on January 18, 2015

These are great sounding speakers! Mids and highs sound clean, and the bass is just right without being over powering. I installed these in the doors of my `08 Sebring Convertible. Crutchfield says they will not fit, but they do! I had to use the spacer ring that comes in the box and 1" screws instead of the factory screws. The door panel went back on with no problems.

Of course now I cannot hear my other speakers. I am planning a new head unit and replacing the rest of the speakers at some point.



Infinity Primus

Written by: Ricky Bobby from Chesterfield, VA on December 3, 2014

Crutchfield Customer Review (What's this?)

Great sound. Compared to pioneer tsd6902s they have a louder crisper sound with more bass. The pioneers give a more natural sound. The 3 ohm impedance makes it more like 4-68 watts rms so that you're able to do more with less. When amplified, these things sound phenomenal.

Pros: Lower power necessity

Cons: Less of a natural sound

Sounds great

Written by: Bubbie! from Walkersville, Md on July 31, 2014

1986 Chevrolet Blazer S10
Crutchfield Customer Review (What's this?)

I love Infinity speakers. I have had a couple of sets in my vehicles. I even have Infinity's for my home theater setup. This car speakers are a major improvement over the factory speakers. Long-live Infinity.

Pros: Great sound, good mid and high rage frequencys

Cons: Not much bass response.


Written by: ATA from rio rancho nm on April 19, 2014

Crutchfield Customer Review (What's this?)

Simply amazing, cant believe how clear they sound.

Pros: massive magnet

Cons: none

Infinity Primus PR9603is

Written by: Eugene R. from Rocky Mount,NC on April 7, 2014

1979 Ford F Series
Crutchfield Customer Review (What's this?)

Exactly the product i wished for and delivered on time as promised. Excellent sound and easy to install made it a wonderful total package deal for me!

Pros: Installations instruction very user friendly.


Good Product

Written by: Pandiyan D. from Nashik on December 1, 2013

Actually we have purchase this product today and this was excellent with sound booster with good sound quality



Hands-on research

What's in the box?

Download owner's manual

  • Two 3-way speakers
  • 2 Grilles
  • 2 Grille frames
  • 2 Bottom mount brackets
  • Eight 2" Self-tapping screws
  • 8 Speed clips
  • 2 Adhesive backed foam gaskets
  • Template on box
  • Owner's manual (English/ Portuguese)

Features and Specs

Design 3-way
Tweeter Design 1" Edge Driven Dome
Tweeter Composition Textile
Woofer Composition Polypropylene
Woofer Surround Butyl Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity 94 dB at 2.83 volts
Frequency Response 46 - 22k Hz
RMS Power Range (Watts) 5-90
Peak Power Handling (Watts) 360
Impedance (Ohms) 3
Top-mount Depth (Inches) 2 3/4
Bottom-mount Depth (Inches) 3 5/16

Product Research


Plus One Woofer Cones: The Plus One speaker cones offer more surface area than 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.

Edge Driven Dome Tweeters: Each speaker has an edge-driven textile soft dome tweeter. An edge-driven tweeter has better dispersion characteristics and allows for a lower crossover frequency than typical tweeters of the same size, which improves imaging. The result is improved vocals and musical clarity.

3-ohm Voice Coil: The Primus Series speakers feature 3-ohm voice coils to compensate for the high in-line resistance of small gauge factory wiring and 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 2-ohm load.

Power Handling: Although Infinity lists the continuous average RMS power handling as 90 watts, they also list the recommended power range as 5-200 watts RMS. We've opted to list the more conservative 90 watt RMS figure on the specifications page.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Customer Q&A

1 question already asked

For details on fit or installation please contact an Advisor by phone (1-800-324-9695) or online chat. They will be able to pull up your vehicle and give you the details on if this will fit and what you will need for an installation in your vehicle. [ Jeff  Aug 12, 2015 ]  Staff