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


List Price: $499.95
Price: $399.95 & FREE Shipping. Details
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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
3 new from $399.95
Is this a gift? Please note that this item ships in its own packaging and cannot be gift-wrapped or concealed.

Over $800 Off a Top-Rated JBL CS6100 Six-Piece Home Theater System

Over $800 Off a Top-Rated JBL CS6100 Six-Piece Home Theater System
This top-rated set of speakers includes high-performance JBL sound, mounting brackets, and great looks that will fit any room. Learn more

Frequently Bought Together

Infinity Primus 12-Inch 400-Watt Powered Subwoofer (Black) + Infinity Primus Three-way dual 5-1/4-Inch Speaker (Each, Center-Channel, Black) + Infinity Primus Three-way dual 6-1/2-Inch Floorstanding Speaker (Black, Each)
Price for all three: $769.89

Buy the selected items together


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  • Six-Month Financing: For a limited time, purchase $149 or more using the Amazon.com Store Card and pay no interest for 6 months on your entire order if paid in full in 6 months. Interest will be charged to your account from the purchase date if the promotional balance is not paid in full within 6 months. Minimum monthly payments required. Subject to credit approval. 1-Click and phone orders do not apply. See complete details and restrictions.

Product Specifications

Brand NameInfinity
Color NameBlack

Technical Details

  • Brand Name: Infinity
  • Model: Infinity Primus PS312
  • Color Name: Black
  • Warranty: one year

Product Details

  • Product Dimensions: 33.5 x 19.5 x 22.5 inches ; 52 pounds
  • Shipping Weight: 54 pounds (View shipping rates and policies)
  • Shipping: This item is also available for shipping to select countries outside the U.S.
  • Shipping Advisory: This item must be shipped separately from other items in your order. Additional shipping charges will not apply.
  • ASIN: B0044D2MRS
  • Item model number: Infinity Primus PS312
  • Average Customer Review: 4.1 out of 5 stars  See all reviews (17 customer reviews)
  • Amazon Best Sellers Rank: #29,965 in Electronics (See Top 100 in Electronics)
  • Date first available at Amazon.com: September 24, 2010

Product Description

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.

    Product Description

    Infinity Primus 12" 400-watt powered subwoofer Black

    Customer Questions & Answers

    Customer Reviews

    4.1 out of 5 stars
    5 star
    13
    4 star
    0
    3 star
    0
    2 star
    0
    1 star
    4
    See all 17 customer reviews
    For under 500 bucks, you can't beat this sub.
    nwow2866
    Smaller sub produce tighter bass and sound better at lower volume.
    ashwats
    Great for home theater or listening to music.
    Mike79

    Most Helpful Customer Reviews

    13 of 14 people found the following review helpful By homethtraddict on July 26, 2011
    Unless your a millionaire with thousands to blow, this sub is all you freakin need for your house. It will rock your socks. It delivers smooth, clean bass with enough bass for your friends to borrow. Before this sub I owned a JBL 12" sub. It was good but this Infinity is GREAT. With the sub being the most important piece of your surround system(or center channel) a good powered sub will make or break your system. This one had definitely made mine.
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    4 of 5 people found the following review helpful By Jim Kane on July 11, 2013
    I give one star as mine is nearing imminent death most likely. When it was without the crackling noise and my worry, it was a four star rating from me. I will be moving on to sealed subs in the future for tighter response, and this crackling sound is leaving it unsellable to my personal belief. It has never left this room and I may just give it away as I have a subwoofer from the 90's that is still churning away beautifully to swap with. Your mileage may vary. I loved it before it started the crackling. Paperweigh, more like anchor. I had the Primus 7.1 matching set, and have moved on with those as well, too bright sounding, near excruciating. Harmon Kardon = Infinity Primus
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    4 of 5 people found the following review helpful By milokw56 on February 1, 2013
    Verified Purchase
    This review is more about Harmon, the company that makes the sub. Of course the speaker is awsome, but when my speaker arrived, I didn't notice that the speaker grill left and right bottom corners were broken. I pretty much assume, that this happened in shipping. Well I emailed infinity, and told them I just purchased the speaker, and didn't noticed the broken grill, until a week later. They had me fax my invoice, to prove I purchased the speaker, and promptly sent me another speaker grill, after recieving the invoice. I just have to say, that is good customer service, I have more than $2000 sunk into infinity speakers, on my home theater, and the system sounds really good. Again props to Infinity/Harmon for stepping up and making it right. Thanks Harmon.
    Oh if you need a great sub, this one is the one to get.
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    1 of 1 people found the following review helpful By michael pavon on April 14, 2013
    Verified Purchase
    You need to feel it to beleive it, i bought an Acustech PL-200 right before this one following reviews and yes, price..
    So disapointed, came "broken", the coaxial plug is deffective (you need to pull the cable in certain way to make it do contact inside, in other words have a false contact) so in the middle of a movie PUFF! No sub any more,and not only that but the "feeling" was like soft, buuummm with a "B" feel overwhelmed. Now this infinity one, oh my gosh, lowder, more powerful and the most important part: bigger response range and the punch is sharper, like Puuummm with a "P", like in a night club... Best bang for the buck.
    2 Comments Was this review helpful to you? Yes No Sending feedback...
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    1 of 1 people found the following review helpful By nwow2866 on February 27, 2013
    Verified Purchase
    My last Infinity sub lasted about ten years and the amp just had enough and burned up. I can say during those ten years, it didn't have it easy. With that said, I bought this one to replace it and am pretty confident I will see the same long lasting performance out of this one for the next ten. For under 500 bucks, you can't beat this sub.
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    1 of 1 people found the following review helpful By mikeyou on November 10, 2012
    Verified Purchase
    I have had 2 of these over the years now and wow you can not beat the awesome sound for this price point.
    A 12" sub is just what you need for your home entertainment center. My room is 20'x30' and when watching a movie the pictures on the walls shake and have fallen. :) Totally AWESOME!!
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    5 of 7 people found the following review helpful By ashwats on February 14, 2012
    Verified Purchase
    Well musically speaking no boom boom, it just plays the cleanest, deepest bass. You just can't go wrong with this, not many subs at this price point with this power output. Also it is substantial, you will feel like you have a sub at home!

    Few leasons learned: Placement of subwoofer is absolutely critical so that there won't be any sound waves cancelling out each other. Like me I would assume everyone will have limitation of where to put it in living room, unless it is in a dedicated entertainment room where you have more fexibility. This kind of reduces its usability. Next thing is if the room is not big enough, this sub would reduce the overall sound quality. Smaller sub produce tighter bass and sound better at lower volume. Some thing to think about if you are considering buying this.
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    2 of 3 people found the following review helpful By Jack Marner on January 7, 2013
    Verified Purchase
    I am biased, I love Infinity. Until a hydro substation explosion got past my surge protectors and took them out, my four Reference towers (RS IIIb’s up front and RS 4B’s in the rear) gave me almost 30 years of phenomenal service. Granted, like the Infinites, my new Mirage OMD towers didn’t really require much help, but, I wanted to supplement them with a little extra, at least for home theater duties ... but the sub had to be musical. That meant I needed exceptional transient response. For me, anything larger than 12" in a home sub-woofer means Doppler effect. The metal matrix cone is an added bonus, especially if the driver is being pushed to the limit, (Maximum strength for the weight.) and this sub has more than enough power to control the excursions. Most subs are “loud and proud.” This sub is musically transparent, even as it rips your house apart. E. Power Biggs, Virgil Fox, Toccata and Fugue in D Miner, Rock On, DTS anything ... it’s a steal!!
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