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Looking to add surround sound excitement to your home? If you already have a DVD player and home theater receiver, this Infinity voice-matched 5.1 speaker system makes it easy. It comes with a center channel speaker, 4 satellites, and the PS-8 powered subwoofer. If you have yet to experience the thrills of home theater surround sound, prepare to be impressed.

This stylish, great-sounding speaker package takes advantage of Infinity's proprietary Metal Matrix Diaphragm (M.M.D.™) driver material. It's derived from the C.M.M.D. material used in Infinity's flagship Prelude™ series. M.M.D. features a stiff aluminum core that allows the speakers to produce rich, precise sound with minimal distortion. The result? Memorable home theater surround sound with exceptional clarity and realism. This system does a great job with multichannel music, too, like SACD and DVD-Audio.

Infinity uses their Primus 140 bookshelf speakers as the fronts and surrounds, each with a 4" mid and 3/4" tweeter. The matching center channel speaker has the same tweeter and adds dual midrange drivers. Directional special effects move effortlessly around the room, enveloping you in the action, and movie soundtracks play out loud and clear. The included 100-watt PS-8 powered subwoofer fills in the bass for serious impact.

If you have a 6.1- or 7.1-channel receiver, you can pick up an extra satellite speaker (or two!) for even more enveloping surround sound.


    Front and surround satellites:
  • bass-reflex
  • each handles up to 100 watts
  • 3/4" M.M.D. tweeter
  • 4" M.M.D. woofer
  • sensitivity 86 dB
  • keyhole slots and threaded insert for easy wall-mounting
  • 5-15/16"W x 9-5/8"H x 7-1/16"D

  • Center channel speaker:
  • acoustic suspension
  • handles up to 100 watts
  • 3/4" M.M.D. tweeter
  • dual 4" M.M.D. woofers
  • sensitivity 87 dB
  • 14-1/4"W x 5-15/16"H x 6-15/16"D

  • PS-8 powered subwoofer:
  • bass-reflex
  • 100-watt RMS amp
  • 8" front-firing M.M.D. woofer
  • continuously variable 50-150 Hz crossover
  • speaker-level and preamp-level inputs
  • 10-11/16"W x 17-7/16"H x 16-1/2"D

  • System specs:
  • video-shielded (except subwoofer)
  • frequency response: 35-20,000 Hz (±3dB)
  • black woodgrain vinyl finish
  • warranty: 5 years (3 years electronics on subwoofer)

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 Pack/PS-8 Reviews

Hands-on research

What's in the box?

Download owner's manual

  • This package contains two separate boxes: the Primus Theater Pack box and the PS-8 Subwoofer box.
  • The Primus Theater Pack box contains:
  • 4 Primus HCS Satellite speakers
  • 1 Primus HCS Center speaker
  • 4 Satellite speaker grilles
  • 1 Center speaker grille
  • 20 Self-adhesive rubber feet
  • Owner's Guide
  • Warranty sheet
  • The PS-8 Subwoofer box contains:
  • 8" Powered subwoofer
  • Owner's Guide
  • Warranty sheet

Features and Specs

Enclosure Bass Reflex
Video Shielded Yes
Pieces in System 6
Color Black
Tweeter Dome
Midrange size (inches) 4
Woofer size (inches) 8
Woofer Composition M.M.D.
Woofer Surround Rubber
Impedance (Ohms) 8
Connector Type 5-way post
Mounting Bracket Included Yes
Recommended Stand Height (inches) 28
Parts Warranty 5 Yrs Speakers/3 Yrs Amp
Labor Warranty 5 Yrs Speakers/3 Yrs Amp
RMS Power Range (watts) 15-100
Subwoofer RMS Power (watts) 100
Main Speakers (inches) 9-5/8H x 5-15/16W x 7-1/16D
Center Speaker (inches) 5-15/16H x 14-1/4W x 6-15/16D
Surround Speakers (inches) 9-5/8H x 5-15/16W x 7-1/16D
Subwoofer (inches) 17-7/16H x 10-11/16W x 16-1/2D

Product Research

Speaker Features
Subwoofer Features
Inputs and Outputs Notes

Speaker Features

Overview: The Infinity Primus Theater Pack consists of four identical 2-way satellite speakers with a 4" woofer and 3/4" tweeter, plus a center speaker with dual 4" woofers and a 3/4" tweeter. To complete a 6.1- or 7.1-channel surround speaker system, you can add one or two additional matching satellite speakers (item 108P140).

Metal Matrix Diaphragm (M.M.D.): All of the speakers in the Primus Series feature Infinity's proprietary Metal Matrix Diaphragm (M.M.D.) drivers. Derived from the C.M.M.D. material used in Infinity's flagship Prelude drivers, M.M.D. features a stiff aluminum core, anodized on both sides for increased strength and rigidity. M.M.D. transducers deliver crystal-clear, distortion-free sound from dynamic digital sources, even at high listening levels.

Woofers: The 4" M.M.D. cone woofer conducts sound faster than paper, polypropylene and Kevlar found in many similarly-priced speakers, pushing unwanted resonances beyond the operating range of the transducer. For a smoother response and improved durability, the woofer uses a rubber surround.

Tweeters: The speaker utilizes a 3/4" M.M.D. dome tweeter and waveguide to deliver a wider, more even, high-frequency response.

Enclosures: The satellite speakers are housed in bass reflex enclosures with front-firing ports. The center channel speaker is an acoustic suspension enclosure.

5-Way Binding Posts: The gold-plated 5-way binding posts will accept pin connectors, spade connectors, banana plugs, dual banana plugs and bare wire. Note: Plastic inserts must first be removed from the speaker terminals before connecting banana plugs or dual banana plugs.

Wall Mounting: The Primus satellite speakers are designed to mount directly to a wall via the two keyholes on the back. Two rubber "bumpers" at the bottom of the back panel provide a non-scratch surface for walls as well as absorb vibrations from the speaker. In addition, there is a 1/4"-20 threaded insert (covered by a rubber plug) located on the back panel for use with third-party speaker brackets/stands. Note: The satellite speakers weigh 7 pounds each, therefore proper mounting of the speaker using weight-appropriate brackets and hardware mounted to wall studs is required.

Subwoofer Features

Metal Matrix Diaphragm (M.M.D.): Derived from the C.M.M.D. material used in Infinity's flagship Prelude drivers, M.M.D. features a stiff aluminum core that provides exceptional strength and rigidity for clean, realistic low-frequency tones.

Amplifier: The 8" M.M.D. front-firing cone woofer is powered by a 100-watt (RMS) amplifier.

Surround: For a smoother response and improved durability, the woofer uses a rubber surround.

Bass Ports: There are two rear-firing bass ports that allow deep bass with high acoustic efficiency and low distortion.

Gain Control: The subwoofer has a rotary control on the rear panel for adjusting the level of the bass.

Phase Switch: The subwoofer's phase switch allows you to control the phase of the subwoofer's output relative to the front speakers. If the bass sounds muddy or unclear, toggling the phase control can sometimes strengthen the bass "attack."

Auto On/Off Circuit: The auto on/off circuit turns the power amp on when a signal is sensed and turns the amplifier off and into standby mode approximately 10 minutes after a signal is no longer received. An LED indicator on the rear panel glows green when the amplifier is on and red when the amp is in standby.

Low-Pass Crossover: The subwoofer features a continuously variable 50-150 Hz low-pass crossover that determines the highest frequency at which the subwoofer reproduces sounds. The crossover has a 24dB/octave slope.

Inputs and Outputs Notes

Line-level Inputs: The subwoofer has a gold-plated LFE input and gold-plated stereo RCA inputs. If you have a Dolby Digital/DTS receiver or processor with a low-frequency-effects (LFE) output, you should use the LFE input on the subwoofer. If your receiver/processor does not contain a Dolby Digital or DTS processor but has a subwoofer output, you must use the stereo RCA inputs. If the receiver/processor has a mono subwoofer output, a "Y" adapter is recommended to maximize performance.

Speaker-level Inputs: The left and right gold-plated 5-way binding posts allow you to connect the subwoofer to a receiver/amplifier using speaker wire.

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.