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Infinity Reference X REF-9603ix

6"x9" 3-way car speaker

Item #: 108R9603IX

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11 Reviews | 1 question - 6 answers

Free Installation gear for most cars

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Designed for more clarity
Do you want to hear the details you've been missing in your car's sound system? You'll enjoy exceptional clarity from Infinity's Reference X Series REF-9603ix 6"x9" speakers. Infinity uses textile tweeters and PEI super tweeters to give you amazing levels of detail without sounding harsh, and a level control switch allows you to boost the brightness to your taste.

Larger woofer for more bass
The REF-9603ix appeals to bassheads too, with tough polypropylene woofers and durable hi-roll rubber surrounds that deliver strong low-frequency performance. Each Plus One+ woofer sports a significantly larger cone than speakers of similar size, adding plenty of punch to the speaker's smooth and accurate highs.

REF-9603ix 6

Great for any power supply
You can power these speakers with up to 100 watts of RMS power — they'll work great with an external amplifier, but they're also sensitive enough to be a good match for a factory or aftermarket stereo. Plus, Infinity comes up with a safe way to get a little more power out of your system — these 3-ohm speakers combine with the speaker wire in your car so your car stereo sees actual 4-ohm impedance. Grilles are included along with Infinity logo badges that can be attached to your factory grilles.

Product Highlights:

  • 6"x9" 3-way speakers (pair)
  • Plus One+ polypropylene woofer cone with hi-roll rubber surround
  • edge-driven textile dome tweeter PEI and super tweeter
  • True Four Ohm Impedance technology: speaker's 3-ohm impedance combines with speaker wire impedance for a 4-ohm load
  • compatible with virtually all factory or aftermarket car stereos
  • power range: 5-100 watts RMS (300 watts peak power)
  • frequency response: 46-21,000 Hz
  • sensitivity: 94 dB
  • top-mount depth: 3-1/16"
  • 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.

Hands-on research

What's in the box?

Download owner's manual

  • Two 3-way speakers
  • 2 Grilles
  • 2 Grille frames
  • 2 Bottom mount rings
  • Eight 2" Self-tapping screws
  • 8 Speed clips
  • 2 Adhesive backed foam gaskets
  • 2 Infinity logos
  • Template on box
  • Owner's manual (English/ Danish/ German/ Spanish/ Finnish/ French/ Italian/ Dutch/ Polish/ Portuguese/ Russian/ Swedish/ Turkish/ Chinese)

Features and Specs

Design 3-way
Tweeter Design Edge-Driven Dome
Tweeter Composition Textile
Woofer Composition Polypropylene
Woofer Surround Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity 94 dB at 2.83 volts
Frequency Response 46 - 21k Hz
RMS Power Range (Watts) 5-100
Peak Power Handling (Watts) 300
Impedance (Ohms) 3
Top-mount Depth (Inches) 3 1/16
Bottom-mount Depth (Inches) 3 5/8

Product Research


Plus One+ Woofer Cones: Each speaker uses a cone significantly larger than other speakers of the same size. This is accomplished by using a unique basket design and hi-roll surround. The Plus One+ design offers greater bass output and increased efficiency.

Hi-roll Rubber Surrounds: The hi-roll rubber surrounds allow the woofers a greater range of movement, resulting in longer X-max and more bass output.

Tweeters: Each speaker uses an edge-driven textile dome tweeter and a super-tweeter for smooth, accurate highs. A switch on the front of the tweeter housing allows you to boost the tweeter output 3dB, useful if the speakers are mounted in a location where high frequencies are easily absorbed.

True Four Ohm Impedance Technology: The speaker's 3-ohm impedance combined with the impedance of your speaker wire provides a true 4-ohm load to your connected head unit or amplifier.

Power Handling: Although Infinity rates the 9603ix speakers at 100 watts RMS (continuous average), they also recommend amplifiers with a power rating from 5 to 200 watts RMS.

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 open the box, verify contents, 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.

Infinity Reference X REF-9603ix Reviews

Average Customer Review:

11 reviews
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Unbelievable Sound

Written By John, Beverly, MA on Tuesday, October 21, 2014

Crutchfield Customer Review (What's this?)

Very clean and crisp highs and lows. Some of the best sounding speakers I've ever installed!

Great ones

Written By Arbster, Oklahoma on Saturday, October 11, 2014

Crutchfield Customer Review (What's this?)

Sound great

Cons: Price high need better connections or at least the connectors


Written By Franki P, Southeast WI on Friday, October 03, 2014

Crutchfield Customer Review (What's this?)

great speakers. Sound is fabulous. Very impressive base, mid range and high end sound.

Pros: awesome sound

Cons: needed a little altering to fit. My car did not come with standard sized speakers. I thought the speakers came with a schoshe kit to fit.

Outstanding Speakers

Written By James W, Chesapeake, VA on Tuesday, September 23, 2014

Crutchfield Customer Review (What's this?)

Even though the site said these speakers would not fit, they went in just fine. The sound quality of these speakers are night and night and day better than the so call "premium Alpine System that came with the car. Clarity and proper bass is what these speakers bought to my Dodge Charger. This was money well spent for sure. Also a special thanks to my product advisor from Crutchfield for all of his help. If you are looking for some proper 6x9 speakers don't hesitate to buy these.

Pros: Solid build, huge magnet, great tweeter. Speaker just reeks high quality.

Cons: Not really a con but, these speakers will fit in a 2014 Dodge Charger!

Excellent speakers

Written By Andrew, Lynchburg, VA on Monday, December 30, 2013

Crutchfield Customer Review (What's this?)

These speakers have a great sound. I was impressed with the bass response. Both the highs and lows are clear. The build quality seems to be very high.

Pros: Great sound

Cons: None so far

Great highs

Written By Greg, Fort Lsuderdale on Thursday, September 19, 2013

Crutchfield Customer Review (What's this?)

I always use these in any upgrade. Tried other brands and they have sounded more muddy. These have the best crisp highs and mids I have heard for any speaker without going to separate components. No need to with these. They are weak on bass but I have always felt that acoustics have been to blame.

Pros: Crisp highs

Cons: Weak bass

Excellent Speakers

Written By Frank V, Keller, Texas on Wednesday, August 21, 2013

Crutchfield Customer Review (What's this?)

I found these speakers to be excellent at all levels. The sound is crisp and clean and probably the best speakers i have purchased to date.

Pros: Great sound and quality

Cons: None

Infinity Reference X Ref-9603ix

Written By Awesome, Chesapeake Va on Friday, June 14, 2013

Crutchfield Customer Review (What's this?)

I installed these in a 1998 Chevy Cavalier with an Alpine Head unit. These are the best sspeakers I have ever owned. They are clean and crisp and have plenty of bass. I love them..Just bought another pair for my blazer. Can't wait to put them in. Don't wait, these are great speakers.

Pros: arrived quick, easy to install, sound great at all levels.

Cons: NONE

Great Speakers

Written By Charles S, Richlands,NC on Friday, March 29, 2013

Crutchfield Customer Review (What's this?)

Just what I was looking for. Really did the trick in my 95 Toyota Tacoma.

Pros: Great sound

Cons: none

Excellent speakers

Written By Arun. S, India on Monday, December 10, 2012

Excellent sound quality good bass, voice is clear and clarity(sharpness) is good. I have installed it for Pioneer 2013 model avh-x2590bt. Value more than money.

Pros: bass is good, voice is so clear, and treble too(extra tweeters dont require).

Cons: nothing.


Written By Eddie P, Pittsburgh, PA on Wednesday, November 21, 2012

Crutchfield Customer Review (What's this?)

I ordered the Infinity Reference 9603ix three way speakers for my 2003 Mitsubishi Eclipse, and they blew my mind. I previously had the Infinity factory speakers located in the rear panel of my car, which began to deteriorate, as they were made out of treated paper. Although they still seemed to match up to most car systems, the tweeters were not doing their job, often making shrill and distorted noises that I could notice as I drove, and the woofers were kind of beat up after ten years of use. So I decided to invest in the same brand, and I am so GLAD I did. These speakers are made EXTREMELY well. The tweeter on these things is one of the clearest i have ever heard on any 2 or 3 way speaker, despite the fact that the high-quality rubber can produce large quantities of bass. If you want to hear all of your highs, I suggest buying these, as the super tweeter also adds significant difference to what you can hear, adding approximately 4 dBs of high frequency to your music. The bass fills my car's small cabin with immensely low tones, and SHAKES EVERYTHING. I LOVE IT! There is no doubt in my mind that these speakers are easily one of the highest quality, yet reasonably priced 6X9 speakers you will find. If you like bass more so than highs, buy the two ways. But if you want bass, but hate to sacrifice crystal clear highs, BUY THESE. They have everything someone could want, AND MORE! Thank you Infinity and Crutchfield, once again with outstanding service.

Pros: Easy Installation Tweeters are unmatched Bass is very full, due to rubber Very high quality, well manufactured Priced well for what you get NO DISTORTION.


Get everything you’ll need to enjoy your new Infinity Reference X REF-9603ix

Reduce ambient road noise and your vehicle's "rattles," for better sound inside your car.
You'll need speaker wire to connect your speakers to your amp.
Keep your speakers clean and dry. They compress to fit behind your speakers.
These speaker connectors are handy if you're running new speaker wire or if your speakers have oversized terminals.
The right tools will help keep your installation simple and clean.
Dynamat 10415 Xtreme Speaker Kit

Dynamat 10415 Xtreme Speaker Kit

Two 10-in. x 10-in. Sheets

Item #: 15410415


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Dynamat 10435 Xtreme Door Kit

Dynamat 10435 Xtreme Door Kit

With four 12" x 36" sheets — covers two doors

Item #: 15410435


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Dynamat SuperLite Tri-Pak

Dynamat SuperLite Tri-Pak

Triple package — 3 sheets, 12 square feet (Model #10612)

Item #: 15410612


Add to Cart
T-Spec 16-gauge Speaker Wire

T-Spec 16-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW16WB1


T-Spec 12-gauge Speaker Wire

T-Spec 12-gauge Speaker Wire

Black/white jacket — priced per foot

Item #: 120SW12WB1


Stinger PRO Series Speaker Wire

Stinger PRO Series Speaker Wire

Priced per foot (16 Gauge)

Item #: 541SPW516B



XTC 6"x9" Speaker Baffles

Protect your speakers (5" depth)

Item #: 237XT69


Add to Cart
Boom Mat 6

Boom Mat 6"x9" Speaker Baffles

Protect your speakers
Regular and slim-line sizes (Regular: 4-1/2" depth)

Item #: 696B050380


Add to Cart
Metra Female Quick Slides

Metra Female Quick Slides

An assortment of female quick slide connectors for connecting to speaker terminals

Item #: 120FQS10PK


Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6NGL


Add to Cart
Metra Crimp Tool and Connectors

Metra Crimp Tool and Connectors

Package contains crimp tool and over 150 pieces

Item #: 120CRIMPKT


Add to Cart
Pro.Fit Hook Tool Set

Pro.Fit Hook Tool Set

Installation tools — pair

Item #: 042DM3022


S&G Tool Aid 87615

S&G Tool Aid 87615

Window and Door Clip Removal Tool

Item #: 18187615


S&G Tool Aid 87650

S&G Tool Aid 87650

Door Trim and Panel Removal Tool

Item #: 18187650


Pro.Fit Wire Worm

Pro.Fit Wire Worm

Installation tool helps route wiring through tight spaces

Item #: 042DM4533


Add to Cart
S&G Wire Cutter/Stripper Tool

S&G Wire Cutter/Stripper Tool

Cuts and strips 12- to 22-gauge wire

Item #: 18119100


Add to Cart
Skewdriver Pro SPK4042

Skewdriver Pro SPK4042

Ratcheting straight and offset screwdriver set with 40 bits (Skewdriver Pro with ratchet handle, pictured)

Item #: 180SPK4042


Add to Cart
Spec Tools SQR-200a Squeeze Wrench

Spec Tools SQR-200a Squeeze Wrench

Narrow space ratchet kit with 18 sockets

Item #: 180SQR200A


Add to Cart
Bojo Trim Panel Tools

Bojo Trim Panel Tools

Set of 6 pry tools — helps remove interior and exterior trim and door panels

Item #: 126CR6LNGL


Add to Cart
Posi-Products™ Car Speaker Connectors

Posi-Products™ Car Speaker Connectors

8 connectors for installing car speakers

Item #: 669PP502


Add to Cart
DEI Heat Shrink Tubing

DEI Heat Shrink Tubing

Black 4-foot length (Assortment)

Item #: 696010839


Add to Cart
Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Pair of sealed 6"x9" wedge-style enclosures (Model BB692W)

Item #: 777BB692W


Add to Cart
Sound Ordnance™ Bass Bunker

Sound Ordnance™ Bass Bunker

Pair of sealed 6"x9" truck-style enclosures (Model BB692-T)

Item #: 777BB692T


Add to Cart

Questions & Answers Ask the community. Share your knowledge.

1 question already asked

They do come with grill's. [ RUDY  Oct 26, 2014 ]
they do come with the grills and the speakers work great. [ Frank  Oct 24, 2014 ]
The screens are included and do not have to be purchased separately. [ JAN-ERIK  Oct 24, 2014 ]
These speakers do come with the screens. [ GABRIELA  Oct 24, 2014 ]
They do come with the grills, screws, and extra Infinity emblems. [ MONTE  Oct 24, 2014 ]
I got these and yes they do come with the grille/screen but depending on where you're installing you won't need them or possibly not have the room for them [ Fred  Oct 24, 2014 ]