Product Description

Infinity Primus Three-way dual 5-1/4" center-channel speaker Black (Each)

From the Manufacturer

A solid center.

Prepare to raise your expectations. Experience home entertainment at a new level of clarity and realism. From unobtrusive bookshelf systems to dazzlingly powerful home theaters, there's an Infinity Primus speaker that's right for every purpose and room in your home.

A well-designed center-channel speaker ensures a listener can clearly hear song lyrics or dialogue above the bombast and bassy low frequencies. The Primus PC351BK splits audio signals from the receiver among five different loudspeakers. Low frequencies are sent to dual 5.25-inch Metal Matrix Diaphragm™ (MMD) woofers. Dual 3-inch MMD® midrange drivers handle the middle frequencies, allowing the tweeter and the woofer to produce sparkle in the high frequencies and boom in the low frequencies, without interruption or interference. Boasting a high crossover frequency of 2,800Hz and a low crossover of 650Hz, the Primus PC351BK reduces strain on the respective speaker drivers, allowing them to independently focus on their respective ranges.

INFINITY PRIMUS PC351BK - At a Glance.

• Three-way center-channel loudspeaker
• Dual 5 1/4" (133mm) MMD® low-frequency drivers
• Dual 3" (75mm) MMD midrange driver
• 3/4" (19mm) MMD high-frequency driver
• Five-way binding posts
• Legendary Infinity engineering - speaker components seamlessly work together as an integrated system
• Extremely low resonance enclosures - hear music exactly as it was recorded
• Tweeter waveguides improve on-and-off-axis high-frequency response
• Precision crossover networks
• Patented MMD transducers significantly improve cone performance, providing ideal rigidity and resistance to precision sound across the entire spectrum

Music and Movies as they were meant to be heard.

Patented MMD transducer technology improves sonic accuracy

Derived from our patented CMMD technology, the Metal Matrix Diaphragm (MMD) approach continues the Infinity tradition of using advanced materials to improve sonic accuracy. These diaphragms are much stiffer than standard metal ones - by anodizing both sides of an aluminum core, we're able to significantly improve cone performance and outperform cones made of paper, polypropylene or Kevlar material.
The patented MMD material's sandwich design makes the driver incredibly strong and lightweight.
Click here to learn more By virtue of its extreme rigidity and resistance to resonance, the MMD material is far more than just another diaphragm substance. It is an ideal diaphragm material for the ultimate listening experience. Sound propagates at a higher velocity in metals than in materials such as polymers and papers. Sound will travel through MMD material nearly twice as fast as it will through any other cone material - thus, moving unwanted resonances outside the audible range.

Acoustical waveguides deliver wide high-frequency response

Where you sit in a room as you listen to speakers can have just as great an effect on their sound quality as the speakers themselves. By using an acoustical waveguide, high frequencies have a wide dispersion throughout the room. To make sure listening to the Primus PC351BK is truly a great experience everywhere in the room and that movie dialog is crisp and intelligible, they use a proprietary "waveguide" around the tweeter. This waveguide ensures a wide dispersion of the high frequencies throughout the room while keeping them both accurate and natural-sounding. The result is an enveloping, realistic sound experience with pinpoint dialog reproduction making the PC351BK perfect for critical music and movie reproduction.

Low-Resonance enclosures do not change or alter the sound

A great sounding loudspeaker should play just what it's told to without changing or altering the sound. One way that a poorly designed loudspeaker can change the sound is when the enclosure resonates or vibrates. Resonance can change a speaker's overall tonal balance and totally alter the sound of the recording that it plays. To eliminate any enclosure resonance from the PC351BK center channel loudspeaker, Infinity engineers the enclosure using pinpoint internal bracing that increases rigidity so it does not vibrate or resonate. Vocals sound clear and natural while the soundstage is smooth and precise. Plus there's the added advantage of a sleek, narrow enclosure that's at home in nearly any room decor.

Superior Infinity engineering delivers sound perfection

Many loudspeaker manufacturers are actually loudspeaker assemblers, buying parts off the shelf from different companies with the goal of assembling them into a final product. While this might help keep costs down, it gives very little guarantee about how the speakers are going to sound. The Infinity Primus PC351BK's speaker drivers, baffles, cabinets and waveguides are all designed and engineered by Infinity to work seamlessly together as an integrated system, fitting together like pieces of a jigsaw puzzle. And since Infinity has engineered each piece for the best possible sound quality, the result is a loudspeaker that we can guarantee will dazzle you no matter what you happen to be listening to.

Infinity - Legendary reputation. Uncompromising craftsmanship and sound.

With the Infinity Primus PC351BK, you not only experience the cutting edge in high-performance transducer technology and sound reproduction, you experience the cutting edge from the makers of Infinity products - some of the world's most innovative, high-quality audio equipment. The road to the Infinity® Primus series is a road lined with dozens of audio milestones: The Infinity Servo Statik 1a - the world's first powered subwoofer. The EMIT® (Electromagnetic Induction Tweeter) device. The revolutionary IRS speaker - the world's first "reference" loudspeaker. The Prelude MTS® speaker - the world's first powered tower speaker. Since 1968, innovative Infinity technologies, materials and manufacturing techniques have advanced the science of sound, and have set new standards in loudspeaker technology and performance. Infinity Primus Series speakers benefit from every Infinity innovation that has come before. This is where Infinity sound begins, and it's well within your reach.

What's in the Box

One Infinity PC351BK center channel speaker

Spec Sheet

When you want a bit more bass than the PS38BK, step up to the larger 10" PS410BK powered subwoofer.


Click here for the Primus PS312BK Powered Subwoofer

Infinity PS312BK

When you really want to rattle your walls with the most explosive home theater possible, then the PS312BK powered subwoofer is for you.