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Infinity Primus PC251

Center channel speaker

24 Reviews | 2 questions - 3 answers

Item # 108PC251BK

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Overview

Our take on the Infinity Primus PC251

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.

Crisp, clear dialogue for TV and movies

Infinity Primus PC251 center channel

Enjoy clear, full center channel presentation with the Infinity Primus PC251.

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.

High quality materials for long term performance

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.

I have the Infinity Primus PC251 matched up with the a pair of P153's and a Sunfire SDS-8 Dynamic 8" Subwoofer. Solid set up. the PC251 does not over power the P153's at all. Crisp highs without harshness and solid unmuddled midrange.

Barry, Millbury, MA

What's in the Box:

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

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
Reviews

Infinity Primus PC251 Reviews

Average Customer Review(s):

(24 Reviews)
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Details

Hands-on research

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
Connections
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.

Connections

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.

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Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

I hope the PC251 will improve clarity and understanding of movie dialog. [ Robert  Mar 31, 2016 ]
price [ Ray  Mar 10, 2016 ]
Price, size and reviews [ Matthew  Feb 21, 2016 ]
Seemed to integrate well with existing Infinity speakers and close out sale made price attractive. [ Jonathan  Feb 14, 2016 ]
Well, just purchased a pair of Infinity Primus P153, and I suspect they will match up very nicely with the P153 [ Barry  Jan 30, 2016 ]
Saw great rating on this speaker, thought I would replace me current speaker and give this a try. [ brian  Jan 15, 2016 ]

2 questions already asked

The cs-355 is the model I bought and returned because the usb input doesn't work with flash drives (thumb drive) as claimed. It treats all of the folders as one folder and not many folders with files as it claims in the operations manual. [ Ted  Feb 09, 2014 ]
You will want to contact an Advisor by phone (1-800-324-9695) or online chat to discuss compatibility with your Alpha speakers. They can discuss voice matching, and other options if these are not a good match. [ Jeff  Jan 31, 2014 ]  Staff
Upgrading the center can result in better performance for a home theater (especially with dialogue). However, you will want to make sure the speakers are voice matched as close as possible. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat to discuss in detail. [ Jeff  Jan 26, 2014 ]  Staff
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