Infinity Primus PC251

Center channel speaker

Item #: 108PC251BK

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15 Reviews


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Infinity's Primus PC251 center channel speaker ensures that you'll clearly hear all your song lyrics or movie dialogue — and at a price tag that won't leave your wallet empty. What's Infinity's secret? A combination of Metal Matrix Diaphragm® driver technology and a low-resonance enclosure. You'll hear sparkling high frequencies and detailed midrange at any volume level. So sit back, relax, and enjoy a listening experience that's more lifelike and involving.

Infinity's Metal Matrix Diaphragm drivers minimize distortion
The Primus PC251 features Infinity's exclusive Metal Matrix Diaphragm ("MMD" for short) driver technology in both the 3/4" tweeter and the dual 5-1/4" woofers. These MMD drivers consist of a stiff aluminum core, anodized on both sides for increased strength and rigidity. The result is extremely fast, extremely accurate response, giving you distinctly cleaner, more realistic sound, even at higher volume levels.

Build your own Primus® system
The Infinity Primus PC251 will fill just about any room with dramatic and well-defined sound. Pair it with Infinity's P363 floor-standing speaker or P153 bookshelf speaker to create a stunning Primus home theater system. And don't forget to add the perfectly matched PS38 powered subwoofer to get deep, accurate bass in the mix.

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Product Highlights:

  • frequency response 80-20,000 Hz (±3dB)
  • handles up to 150 watts
  • sensitivity 90 dB
  • 8-ohm impedance
  • Metal Matrix Diaphragm® drivers minimize distortion
  • 3/4" MMD dome tweeter
  • dual 5-1/4" MMD woofers
  • magnetically shielded for safe placement next to older tube TVs
  • acoustic suspension (sealed) design
  • black woodgrain vinyl finish
  • 5-way binding posts
  • 18-1/8"W x 7-3/8"H x 9-13/16"D
  • weight: 17.6 lbs.
  • warranty: 5 years
  • Our 60-day money-back guarantee

Your home theater's most important speaker

The center channel speaker is the workhorse in a home theater system. It has to reproduce clear dialogue and special effects that keep your eyes and ears glued to the movie action. A high-quality center speaker is a great investment for any surround sound setup. Try to choose one that's as closely matched as possible to your front right and left speakers, so that as sound moves across the front stage, it stays seamlessly realistic.

Infinity Primus PC251 Reviews

Average Customer Review:

15 reviews
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Would recommend

Written By TroyK, State College, PA on Monday, November 16, 2015

Crutchfield Customer Review (What's this?)

This was a replacement of an older generation of the speaker. The prior was damaged in a household move. I have many different high end brand speakers throughout the home, most of which cost notably more than the Infinity. For what it's worth, I find these to be among the best in terms of sound quality for price.

Pros: Excellent value. Good cabinet finish.

Cons: Can't think of any.


Written By Mongoose, Florida on Sunday, October 11, 2015

Crutchfield Customer Review (What's this?)

PC251 pairs very well with floor standing Infinity Beta 50 towers. Added the center channel to enhance dialog in steaming content and was not disappointed. Paired with a Denon S900W AVR, seamless calibration and connection. Simply put, the speaker sounds terrific.

Great In Home Theater

Written By Damien, New York on Monday, July 06, 2015

Crutchfield Customer Review (What's this?)

I have this PC251 Center Channel speaker, by design, pairs very well with my Primus 300 series floor standing Front Speakers and Primus 153 bookshelf speakers for surrounds. Since my room is only about 12'x22' in size - I didn't think the PC 300 series Center channel would be necessary. As I am not an audiophile, and did not individually test each speaker, my comments are based on the overall performance of the 7.1 Channel Infinity Primus speakers I put together.

It it's job beyond what I could ask. I've only heard it in concert with all 7.1 channels or at minimum "3.1" stereo with the my floor standing Speakers. Originally I had wanted to go with a Klipsche set up... but, I'm glad I didn't. The clarity in base (along w/ the Infinity 10" powered Sub) mids and highs is fantastic for movies and music. So far, I've used this mostly for Pandora streaming. I put this system together for our in-home theater which does very well with our 92" projection screen.

We watched the most recent version of Godzilla, and Taken 3 - on more than one occasion, I had to double check over my shoulder because when the speakers are paired together (also some credit due to my Pioneer Elite receiver) the sound effects are incredibly real. I think vocal tones sound very real, not overly flat, and not overly bass-y.

This (I am hoping) has to be one of the best speaker series for the $ that i have come across. I highly recommend it

Pros: - Size is reasonable - Looks good with and w/o grills - great vocal tones - versatile for movies and music

Cons: - None yet

Center speaker

Written By AK, Indiana on Saturday, June 20, 2015

Crutchfield Customer Review (What's this?)

Just installed this center speaker for a new home theater system in my basement. Small room with short ceilings but with my Denon receiver and Audyssey set-up this center speaker sounds great. Crisp sounds, clear dialogue and balances nicely with the surround speakers and subwoofer.

Infinity Primus PC251

Written By Daniel, United States on Friday, February 06, 2015

Crutchfield Customer Review (What's this?)

Sounds Great ! Awesome crystal clear highs .

Infinity Primus PC251

Written By Anonymous, Independence, Mo on Wednesday, January 07, 2015

Crutchfield Customer Review (What's this?)

Have only had the speaker for a week But i am lovein it.

Great Speaker

Written By Columbus John, Columbus, OH on Tuesday, December 30, 2014

Crutchfield Customer Review (What's this?)

I had missed the great audio days of the 70's. Recently I purchased a Yamaha RX-V477. I wanted to get speakers that would compliment that unit. The Infinity Primus P363 tower speakers, P153 bookshelf speakers, PC251 center speaker, and PS38 woofer are great. My music sounds great. Watched a movie with the family and felt like I was in the theater. Great speakers.

Pros: Sound reproduction is very good. Enclosures allow the sound to be natural.


Written By irishwitch, Yonkers, NY on Wednesday, April 23, 2014

Crutchfield Customer Review (What's this?)

Techs and reps are the greatest at Crutchfield. Speaker was on sale and I got the best price than anywhere else! The sound is awesome!

Pros: Everything!

Cons: Nothing!


Written By Victor, Lake Worth,FL on Friday, December 06, 2013

Crutchfield Customer Review (What's this?)

Well worth the $$$ this my second one purchased for bedroom system

Pros: Great product Crutchfield service 2nd to none

Cons: None

Infinity Primus PC251

Written By Shari, Phoenix AZ on Thursday, November 21, 2013

Crutchfield Customer Review (What's this?)

great sound, using as a center speaker..

Pros: sound is great

Cons: must attach bare wire, and not use banana plugs

Infinity Primus PC251

Written By Dan, Oregon on Saturday, March 23, 2013

Crutchfield Customer Review (What's this?)

Nice sound, and solid build for a good price. I have one of these both for my living room system, and my computer room system. These center channels sound great for their size, and provide great sound for a reasonable price. They take some break in time, so if they sound a little off out of the box, give them some time.

Pros: build quality price

Great center!!!!!!!!

Written By warcry, Independence MO on Thursday, January 10, 2013

Crutchfield Customer Review (What's this?)

I got this great center speaker yesterday and hooked it up as soon as it got here,It provides a seamless transition between L+R channels and great dialog with movies.Its voice matched to my Infinity towers.My system is now complete and I couldnt be happier.Thanks Crutchfield and all the advisors who assisted me!

Pros: Sounds soooooo sweet now

Cons: none

Excellent Value

Written By Rick, Charlotte, NC on Sunday, July 08, 2012

Crutchfield Customer Review (What's this?)

This was purchased to replace an Infinity CS Video center speaker purchased 15 years ago. At the time, the CS cost over $300. Rather than replace the cones and foam of the old one, I chose to purchase a new one but decided not to spend as much money. The Infinity Primus PC251 has been a great purchase. Delivery was efficient and fast. Installation was 5 minutes, the sound is very good and the cost/quality value is excellent. I kept my old JBL L5 speakers (4) and my Cerwin Vega subwoofer and the new Primus fits right in. I would highly recommend this center speaker.

Pros: Great sound and reasonably priced.

Cons: The cabinet is a little large. If you have limited space, this one could be a challenge.

Infinity Primus PC251

Written By Matt I, Clyde NC on Monday, March 12, 2012

Crutchfield Customer Review (What's this?)

This is a very well made speaker. The sound is awesome. Blends in with my Infinity 362's and is a definite improvement over a previous center channel speaker I had.

Pros: Great sound and features.

Cons: None

Center channel purchase

Written By Watchman, Wtrfrd ca on Tuesday, February 14, 2012

Crutchfield Customer Review (What's this?)

Purchased infinity center channel speaker Primus 251 sounds good for my smaller space very pleased

Pros: Love the sound and how it Blended with my other older surround speakers

Cons: None I can see or hear

Hands-on research

What's in the box?

Download owner's manual

  • Black center channel speaker
  • Black grille (removable)
  • 4 Self-adhesive rubber feet
  • Owner's Manual
  • Warranty sheet

Features and Specs

Enclosure Acoustic Suspension
Tweeter Dome
Midrange size (inches) N/A
Woofer size (inches) 5-1/4
Connector Type 5-way posts
Power Range 10-150
Sensitivity 90 dB
Impedance (Ohms) 8
Frequency Response 80-20k Hz
Height (inches) 7-3/8
Width (inches) 18-1/8
Depth (inches) 9-13/16
Weight 17.6 lbs
Parts Warranty 5 Years
Labor Warranty 5 Years

Product Research

Driver Technology
Enclosure Design
Mounting Options

Driver Technology

Metal Matrix Diaphragm (M.M.D.): 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.

5-1/4" Woofers: The dual 5-1/4" M.M.D. cone woofers offer extremely accurate lower midrange response for cleaner, more realistic sound. For a smoother response and improved durability, the woofers use rubber surrounds.

3/4" Tweeter: The center channel speaker has a 3/4" M.M.D. dome tweeter that offers superior stiffness and damping compared to traditional metal domes.

Acoustical Waveguide: The PC251's tweeter utilizes an acoustical waveguide to deliver, more even high frequency response, no matter what part of the room you're in.

Precision Crossover: The center channel speaker features a 2-way crossover system with crossover frequency at 3000Hz. The crossover has a 24dB/octave slope.

Matching System: The PC251 is voice-matched to all the speakers in the Primus line, so a complete matching system can be built.

Magnetically Shielded: The Infinity Primus center channel loudspeaker is magnetically shielded for safe placement adjacent to your television.

Enclosure Design

Wood Grain Vinyl Cabinet: The Infinity PC251 features a black wood grain vinyl cabinet that matches almost any decor.

Acoustic Suspension Design: The Infinity center channel utilizes an acoustic suspension (sealed) enclosure for tight, accurate midbass performance.

Low Resonance Enclosure: The PC251 employs a extremely low resonance enclosure, so you hear the music exactly as it was recorded.

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


5-Way Binding Posts: The 5-way binding posts will accept bare wire, pin connectors, spade connectors, banana plugs, and dual banana plugs.

Color-Coded: The speaker's binding posts are color-coded (red/black) for easy identification between positive and negative.

Mounting Options

Wall Mounting: The center channel speaker has two keyhole slots in the upper left and right corners of the back panel. 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.

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.

Looking for more? Check out the next model in this lineup.

Infinity Primus C351

Infinity Primus PC351


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$199.99 After $80.00 Price Break

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Hear more robust special effects

The Infinity Primus PC351 offers these features:

adds two 3" MMD midranges for more precise and robust dialogue and special effects