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Looking for big home theater sound on a budget? Then check out this Infinity Primus™ home theater system. It comes with four bookshelf speakers designed to deliver exciting, wraparound sound effects with movie, TV show, and video game soundtracks. The perfectly matched center channel speaker dishes out clear dialogue, too. Just be sure to add an Infinity powered subwoofer for full home theater impact.

The key the performance of the Primus Series is Infinity's proprietary Metal Matrix Diaphragm™ speaker cone material. It uses a stiff aluminum core to add rigidity to the drivers, allowing the speaker to reproduce clean, accurate sound, even when you turn it up loud. You'll hear a broad soundstage and precise imaging that really brings your movies and music to life.

All five speakers easily fit on shelves or an entertainment stand. You can also wall-mount the front and rear speakers using optional hardware.

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Product Highlights:

  • includes four bookshelf speakers and a matching center channel speaker
  • system frequency response: 100-20,000 Hz (±3dB)
  • handles up to 100 watts
  • sensitivity: 86 dB bookshelf speakers; 87 dB center channel speaker
  • 8-ohm impedance
  • Metal Matrix Diaphragm™ drivers minimize distortion
  • bookshelf speakers each contain a 3/4" dome tweeter and 4" woofer
  • center channel speaker contains a 3/4" dome tweeter and dual 4" woofers
  • video-shielded for safe placement next to tube TVs
  • 5-way binding posts
  • bookshelf speakers feature bass-reflex (ported) enclosures
  • center channel has an acoustic suspension enclosure
  • black woodgrain vinyl finish
  • keyhole slots for easy wall-mounting (surround speakers only)
  • bookshelf speakers each measure 5-15/16"W x 9-15/16"H x 6-13/16"D
  • center channel measures 14-7/8"W x 5-7/8"H x 6-7/8"D
  • bookshelf speakers weigh 7 lbs. (each)
  • center channel weighs 10 lbs.
  • warranty: 5 years
  • Our 60-day money-back guarantee

Why choose a pre-matched speaker system?

Looking for speakers that'll deliver thrilling, edge-of-your-seat surround sound? Choosing a pre-matched speaker system is one way to ensure seamless home theater performance. These systems are made up of speakers that share the same tonal characteristics — that means the sound will stay consistent as it moves from speaker to speaker around your room. Most pre-matched systems come with a subwoofer — a must-have for high-impact bass.

Infinity Primus™ Theater 5-pack II Reviews

Average Customer Review:

3 Reviews

Great speakers!!!!

Written by: Chuck C. from Dover,Delaware on March 3, 2014

Crutchfield Customer Review (What's this?)

these speakers are AWESOME!!!!!they sound GREAT....brought them mainly for surround sound and they play flawlessly!!!they sound great with music too....but don't get much use for that thing that happened concerning these day i came home and found a pair...MISSING!!!!i have NEVER found what happened to those speakers....and im still highly upset everytime i think about what happened!!!!i have the front two with the center channel but that other set disappeared!!!!if i could find another pair to replace my missing ones....!!!!!!!

Pros: great sound for surround sound and music also!!!!!

Cons: none at all!!!!

Infinity Primus II Speakers are great

Written by: David S from Irmo, SC on February 3, 2012

Crutchfield Customer Review (What's this?)

The sound is crystal clear and these speakers, while not super small, are very inconspicuous in the room.I would highly recommend these speakers because they sound better than most that cost considerably more.

Pros: great sound, nice size, attractive finish, easy to set up.

Cons: none


Written by: GreG from Oklahoma City, OK on October 14, 2011

Crutchfield Customer Review (What's this?)

These speakers pack the punch needed for a large family room. We have a theatre room, so we weren't trying to make our family room into that. But, we did want to get good sound for general TV entertainment and football games. These speakers are amazing in how they are able to seperate the background nosies from the voices, making movies and Refs totally clear. We use these in a room we call the cube, it is 18'W x 18'D x 20'H. The speakers are capable of filing a room this size. I would highly recommend these speakers for general family surround sound...



Hands-on research

What's in the box?

Download owner's manual

  • 4 Black bookshelf loudspeakers
  • Black center-channel loudspeaker
  • 5 Black cloth grilles (attached)
  • 20 Self-adhesive rubber-feet
  • Owner's Guide

Features and Specs

Enclosure Sealed/Ported
Video Shielded Yes
Pieces in System 5
Color Black
Tweeter Dome
Midrange size (inches) N/A
Woofer size (inches) 4
Woofer Composition M.M.D.
Woofer Surround Rubber
Impedance (Ohms) 8
Connector Type 5-way post
Mounting Bracket Included Keyhole (bookshelf)
Recommended Stand Height (inches) 24-28
Parts Warranty 5 Years
Labor Warranty 5 Years
RMS Power Range (watts) 10-100
Subwoofer RMS Power (watts) Not Given
Main Speakers (inches) 9-15/16H x 5-15/16W x 6-13/16D
Center Speaker (inches) 5-7/8H x 14-7/8W x 6-7/8D
Surround Speakers (inches) 9-15/16H x 5-15/16W x 6-13/16D
Subwoofer (inches) No Subwoofer

Product Research

Overview: The Infinity Primus II Theater Pack is a 5-piece home theater loudspeaker system that includes four identical bookshelf speakers and a matching center channel. The Primus II Theater Pack is ideal for reproducing home theater and multi-channel audio programs. The included bookshelf speakers can be placed on shelves or wall-mounted. Add an Infinity powered subwoofer (108PS210BG, sold separately), with its thunderous, tight, clean bass, to reproduce the full impact and realism of today's music and movie soundtracks.

Note: No speaker wire is included (sold separately).

Driver Technology
Enclosure Design
Mounting Options

Driver Technology

Metal Matrix Diaphragm (M.M.D.): The Infinity Primus II Theater Pack is a 5-piece home theater loudspeaker system utilizes M.M.D. (Metal Matrix Diaphragm) drivers. Derived from the C.M.M.D. material used in Infinity's flagship Cascade series, M.M.D. features a stiff aluminum core, anodized on both sides for increased strength and rigidity. M.M.D. transducers conduct sound faster than paper, polypropylene, and Kevlar - pushing unwanted resonances beyond the operating range of the transducer. M.M.D. drivers deliver crystal-clear, distortion-free sound from dynamic digital sources, even at high listening levels.

4" Woofers: The four matching bookshelf speakers feature a single 4" M.M.D. cone woofer, while the horizontal center-channel speaker features dual 4" M.M.D cone woofers. The 4" M.M.D. cone woofers offer extremely accurate midrange response for cleaner, more realistic sound. For a smoother response and improved durability, the woofers use rubber surrounds.

3/4" Dome Tweeter: Each speaker in this home theater package has a 3/4" M.M.D. dome tweeter that offers superior stiffness and damping compared to traditional metal domes.

Waveguide: The M.M.D. dome tweeters utilize an acoustical waveguide to deliver, more even high frequency response, no matter what part of the room you're in.

2-Way Crossover: Each speaker features a 2-way crossover system with crossover frequency at 3300Hz. The crossover has a 24dB/octave slope.

Enclosure Design

Bass Reflex Bookshelf Enclosures: The Infinity Primus II Theater Pack's bookshelf loudspeakers feature a bass-reflex enclosure with a front-firing port. The front-firing port measures 1" in diameter. The ported enclosure increases the speakers efficiency and bass response. 

Acoustic Suspension Center-Channel: The Infinity Primus II Theater Pack's center-channel loudspeaker features an acoustic suspension enclosure. The sealed enclosure offers tight, accurate bass.

Internally Braced Cabinet: Each speaker cabinet is rigid and well-braced in order to deliver uncompromised performance, without distortion.

Wood-Grain Vinyl: Each enclosure features a black wood-grain vinyl cabinet.

Grille: Each speaker comes with a removable black cloth grille with a rigid plastic frame.


5-Way Binding Posts: The gold-plated, 5-way binding posts will accept bare wire, pin connectors, spade connectors, and banana plugs (single or dual).

Color Coded: The binding post speaker terminals are color-coded (red/black) to distinguish between positive and negative.

Mounting Options

Rubber Feet: Each speaker in the system comes with 4 rubber self-adhesive feet to help secure them in place to prevent slippage and vibration.

Wall Mounting: The four matching bookshelf loudspeakers have two keyhole slots in the upper left and right corners on back of the cabinet (mounting screws sold separately). In addition, two non-skid rubber bumpers are attached in the lower corners so the speaker won't mar wall surfaces when the speaker is mounted. There is also a rear-mounted 1/4"-20 threaded insert on back of each bookshelf speaker that lets you use an optional articulating wall-mount bracket (sold separately).

Note: The center-channel loudspeaker is not equipped with a keyhole slot or threaded insert. The speaker is designed to be placed on a table, stand, or shelf using the supplied rubber-feet. The Pinpoint AM15 center-channel wall-mount (121AM15B, sold separately) does allow you to wall-mount the center speaker, if necessary.

Magnetically Shielded: All speakers are magnetically shielded, so you can place them safely next to your television.

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.