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Infinity Primus PS312 12-Inch 400-Watt Powered Subwoofer (Black)

4.1 out of 5 stars 43 customer reviews

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  • The 12" MMD woofer is housed inside a bass-reflex cabinet to deliver tight, accurate, punchy bass with frequencies as low as 25Hz
  • An internal amplifier provides 400W of power for strong, clear audio with low distortion
  • The rear panel features controls for phase, crossover and level adjustment so you can customize the performance to match your space and application
  • Rear-panel features a stereo RCA line/LFE input, allowing the sub to accept signals from multiple types of receivers
  • Isolation feet on the bottom decouple the sub from the floor to reduce vibrations and reflections
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Alexa Audio
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This item Infinity Primus PS312 12-Inch 400-Watt Powered Subwoofer (Black)
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Customer Rating 4 out of 5 stars (43) 4 out of 5 stars (1913) 4 out of 5 stars (137) 4 out of 5 stars (21) 4 out of 5 stars (63) 4 out of 5 stars (84)
Price Unavailable $179.99 $349.00 $699.98 $899.00 $499.99
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Item Dimensions 19.5 x 33.5 x 22.5 in 15.12 x 18.19 x 16.12 in 18.5 x 14 x 16 in 17 x 17 x 17 in 19.5 x 22.3 x 21.5 in 18.4 x 15 x 18.4 in
Speaker Type Subwoofers Subwoofers Subwoofer Subwoofers Outdoor/Surround Subwoofers

Product description

Product Description

Infinity Primus 12" 400-watt powered subwoofer Black

From the Manufacturer

Not just loud. Accurate.

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 system that's right for every purpose and room in your home.

Let's be honest - there's not a whole lot to a subwoofer. It's one big speaker that likes to get loud and shake pictures off the wall. So what separates a good sub from the not-so-good? It's more than power: Give anything enough juice and it will get loud. The secret to a good powered subwoofer is its accuracy and clarity. We should know. We invented the powered subwoofer in 1968. We've come a long way since then. With the Infinity Primus PS312BK's Metal Matrix Diaphragm technology and low resonance enclosures, it possesses excellent transient frequency response - agile and sharp - and music is clean and movies rumble. Hear music the way it was meant to be heard, and experience a film score like never before, without the speaker changing or altering the sound - precisely as it should be. With its superb linear frequency response you can fill any room with sound you can feel. Got an older system? Bring it to life with an Infinity Primus PS312BK subwoofer. Give your system a soul - just make sure you've secured your pictures to the wall first.

  • Single 12" (300mm) MMD driver
  • 25Hz - 150Hz frequency range
  • 400 watts RMS
  • 700 watts peak
  • 50Hz - 150Hz 24dB/octave continuously variable
  • 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
  • Precision crossover networks
  • Patented MMD transducers significantly improve cone performance, providing ideal rigidity and resistance to precision sound
    across the entire spectrum


  • The PS312's MMD woofer is able to deliver high output and deep bass.

    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.


    Powerful amplification delivers high output and low frequency extension

    What we hear and feel as bass during your favorite action movie is actually the movement of air. The PS312BK really gets the air moving with an incredibly powerful 400-watt amplifier for high output and deep low frequency extension. While moving lots of air is great for those explosions and car chase scenes in movies, you also want an amplifier that is both accurate and efficient to deliver those more subtle bass notes that might come from your favorite musical track. Good thing that the PS312BK's amplifier is both powerful and audiophile enough to excel at both.

    A 400-watt, audiophile quality amplifier is poweful enough for even the most demanding systems
    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 PS312BK powered subwoofer, Infinity engineers the enclosure using pinpoint internal bracing that increases rigidity so it does not vibrate or resonate. Bass sounds tight and deep with out being muddy or boomy. 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

    The Infinity Primus PS312BK's speaker drivers, baffles, cabinets and waveguides are designed to work seamlessly together as an integrated system - fitting together like pieces of a jigsaw puzzle. It begins with our ultra-precise transducers - the beating heart of the Primus PS312BK. MMD technology doesn't change, color or distort audio signal sound the way diaphragms made of other materials do. This combines with the Primus speaker's low resonance enclosures to compound the precision qualities of the transducer, further eliminating mechanical distortion.



    Infinity - Legendary reputation. Uncompromising craftsmanship and sound.

    With the Infinity Primus PS312BK, 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 PS312BK 12" powered subwoofer, one subwoofer cable

    Spec Sheet


    Click here for Spec Sheet









    Complete your Infinity Primus Home Theater




    Infinity P363BK

    For the ultimate Primus home theater system, pair the PS312BK powered subwoofer with the flagship P363BK floorstanding loudspeakers.





    Infinity PC351BK

    Take your movie dialog to the highest level by using the flagship, three-way PC351BK center channel speaker.




    Infinity PC251BK

    Want nearly all the performance of the PC351BK center channel loudspeaker at a price that is just a little more affordable? The PC251BK is the perfect center channel loudspeaker for the job.




    Infinity P153BK

    When you don't have a lot of room but still want great Infinity sound quality, pair the PS312BK with the Primus P153BK bookshelf speakers. They deliver rich, detailed sound quality and are perfect front or rear channel speakers in a 5.1 or 7.1 home theater.





    Infinity PS410BK

    If the PS321BK doesn't fit your budget or if your room is a bit smaller, the 10" PS410BK might fit the bill.





    Infinity PS38BK

    If you have a small room or not a lot of space, they 150-watt 8" PS38BK powered subwoofer delivers a lot of bang for the buck.


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