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Infinity Primus PC251

Center channel speaker

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  • Infinity Primus PC251

    Front

  • Infinity Primus PC251

    Shown with grille on

 

Our take on the Infinity Primus PC251

by Kristen Schaub
Infinity

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'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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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

Hands-on research from the Crutchfield Labs (what are the Labs?)

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
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

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.

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.

 
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Infinity Primus PC251 Reviews

Average Customer Review:

8 people say:

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5 out of 5

AWESOME

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!
Was this review helpful?    Yes | No
 
5 out of 5

PC251 PRIMUS

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
3 out of 3 people found this helpful
Was this review helpful?    Yes | No
 
5 out of 5

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
Was this review helpful?    Yes | No
 
5 out of 5

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
1 out of 1 people found this helpful
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5 out of 5

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
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5 out of 5

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.
1 out of 1 people found this helpful
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5 out of 5

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
1 out of 1 people found this helpful
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4 out of 5

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
4 out of 5 people found this helpful
Was this review helpful?    Yes | No
 

2 questions already asked

How is the voicing of this speaker compared to the Alpha series? [ R. J.  Jan 29, 2014 ]
2 answers
  • 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 Staff  Jan 31, 2014 ]
I have a Infinity Primus Theater Pack that consist of 4 P140 and a matching center with 4'' driver. Do you think that upgrading the center to a PC251 migth make a difference ? Thanks Jerome [ Jerome  Jan 24, 2014 ]
1 answer
  • 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 Staff  Jan 26, 2014 ]

Add accessories for the Infinity Primus PC251

You'll need wire to connect your center channel speaker to your amp or receiver.Cut your speaker wire to the exact length you need with a spool of bulk speaker wire. No wire is included with this speaker. See all categories & accessories

AudioQuest X2 Speaker Cable 14-gauge cable, connectors optional (30 feet, Gray)
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AudioQuest G2 Speaker Cable 16-gauge cable, connectors optional (30 feet, Gray)
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Monster XPHP™ MKII Speaker cable with clear jacket (100 feet)
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Monster XP® Speaker cable with clear jacket, connectors optional (100 feet)
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9 people say
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Monster XP Mini Twist-on Pin Connectors 4 pair, 16-gauge (4 pair)
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Original Monster Cable With gold pin connectors (15-foot pair)
34 people say
Your Price: $39.99
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Monster Cable SuperFlat™ Mini Decor-friendly speaker cable with gold pin connectors (50-foot spool)
25 people say
Your Price: $34.95
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AudioQuest Type 4 Single center speaker cable with pre-attached banana connectors (10 feet)
8 people say
Your Price: $124.49
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Sanus NFC18 Single 18" center channel speaker stand (Black)
3 people say
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Pinpoint AM15 Center channel speaker wall mount
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For a more in-depth review and enhanced detailed information on the Infinity Primus PC251, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_108PC251BK/Infinity-Primus-PC251.html ).

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