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  • Infinity Primus 8-Inch 150-Watt Powered Subwoofer (Black)
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Infinity Primus 8-Inch 150-Watt Powered Subwoofer (Black)

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List Price: $299.95
Price: $199.95 & FREE Shipping. Details
You Save: $100.00 (33%)
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  • The 8" MMD woofer is housed inside a bass-reflex cabinet to deliver tight, accurate, punchy bass with frequencies as low as 35Hz
  • An internal amplifier provides 150W 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 input and an RCA 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 $138.00
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Frequently Bought Together

Infinity Primus 8-Inch 150-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: $579.41

Buy the selected items together

Special Offers and Product Promotions

  • Amazon Free 30-Day Tech Support: This item is eligible for free tech support for 30 days from the date of delivery. Over the phone, our trained technicians can help you set up, configure, connect, and troubleshoot so you can start enjoying your new purchase. Owners of qualifying products can reach Tech Support by calling 1-800-362-5703. Learn more


Product Specifications

Brand NameInfinity
Color NameBlack

Technical Details

  • Brand Name: Infinity
  • Model: Infinity Primus PS38
  • Color Name: Black
  • Warranty: one year

Product Details

  • Product Dimensions: 18.5 x 13.8 x 22 inches
  • Shipping Weight: 37.8 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: B0046A8R78
  • Item model number: Infinity Primus PS38
  • Average Customer Review: 4.8 out of 5 stars  See all reviews (21 customer reviews)
  • Amazon Best Sellers Rank: #12,303 in Electronics (See Top 100 in Electronics)
  • Date first available at Amazon.com: October 1, 2010

Product Description

Product Description

Infinity Primus 8" 150-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 PS38BK'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 PS38BK subwoofer. Give your system a soul - just make sure you've secured your pictures to the wall first.

  • Single 8" (200mm) MMD low-frequency driver
  • 35Hz - 150Hz frequency range
  • 150 watts RMS
  • 300 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 PS38'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 PS38BK really gets the air moving with an incredibly powerful 150-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 PS38BK's amplifier is both powerful and audiophile enough to excel at both.

    A 150-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 PS38BK 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 PS38BK'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 PS38BK. 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 PS38BK, 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 PS38BK 10" 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 PS38BK 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 PS38BK 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

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





    Infinity PS312BK

    Have a large room or want to really rattle your walls with the most explosive home theater possible, then the PS312BK powered subwoofer is for you.


    Customer Reviews

    4.8 out of 5 stars
    5 star
    18
    4 star
    2
    3 star
    1
    2 star
    0
    1 star
    0
    See all 21 customer reviews
    High quality, amazing product.
    Dinh Le
    Excellent decision to purchase this instead of the other more expensive options for the same features.
    LE
    Would recommend to anyone for a small to medium size room.
    Jon H. Kowitz

    Most Helpful Customer Reviews

    4 of 4 people found the following review helpful By Brendan Bhagan on September 2, 2012
    I have had this sub for several years since they came out, it gets a good work out every weekend and some week nights playing movies from bluray. At first it was in my bed room 16x14 in an apartment and was more than powerful, not to much boominess that most ported subs have it sounded fairly tight but drops off qickly under 50 hz. Now I have moved into a house with a 20x17 bedroom and 17x30 living room that opens into the kitchen. I was a bit surprised that in movies even in that large space the sub was still able to give pleasing lfe effects when placed in a corner but in music it just doesn't have enough thump anymore. I let my Yamaha receiver auto adjust the sub levels and as usuall the gain dial is set to around the 10 to 11 o'clock position with crossover at 100 hz. I am shopping around now for another sub to supplement it but will now have to pay a lot more, I will probably end up with the emotiva or a similar wireless sub to make placement easier and use this one still right by the couch or similar. I have not had any problems with the sub and for the price it easily out does any HTIB sub, I will say it is great for a small room but runs out of steam once you go into a larger space.

    For reference I am running a yamaha 6190 receiver to the emotiva upa-7 with infinity primus 362 fronts, 252 rears, the 350 center channel and then the ps38 sub. This is a good product but you should shop up to a larger sub especially if your going to eventually move into a larger space or just to have some more head room just in case.
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    2 of 2 people found the following review helpful By Robert G. Rowland on March 26, 2012
    Verified Purchase
    I don't know if I just got lucky and caught the best sale on Amazon at the right time, but I already have one of these subs and I was thrilled with it so I decided to get another for my 7.2 system. I got it for $141 here on Amazon, brand new, and the dual sub setup with these subs BOOM! Music, Movies, and everything in between come to life in a whole new way. It must have been a wholesale price for $141, but even for $299 I was extremely happy with this sub. It sounds comparable to a good 10" and most 8" amplified subs are 100 watts while this one is 150. You can feel the difference. If your receiver has the ability to run 2 subs, get these! You cant beat the boom for the buck.
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    2 of 2 people found the following review helpful By David Watson on March 21, 2014
    Verified Purchase
    I bought this powered sub for my living which is 20ft by 16ft. WOW WOW I watched behind enemry lines as a test drive last night I now know what I have been missing to home theater. I run this sub with primus 163 in the front 143 in the back with the 351 center and the sound is amazing. This is more than enough
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    1 of 1 people found the following review helpful By NO on January 19, 2014
    Verified Purchase
    I couldn't imagine going with a higher end subwooder unless you have a dedicate room. This thing is great and provides good smooth base that fills even a really large room. I was extreamly impressed.
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    1 of 1 people found the following review helpful By Bloomberg10 on January 13, 2014
    Verified Purchase
    I purchased this sub to go along with my Yamaha surround system. Full body, relatively small sized (the rectangle shape fits in easier than a square). High quality, highly recommended.
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    1 of 1 people found the following review helpful By Fareed on August 20, 2013
    Verified Purchase
    I had serious reservations about the quality of this product. It seemed too cheap to delivery the deep belly rumbling, mind vibrating, anxiety driving body highs that I was looking for. I'm using it with Infinity bookshelves and center in front, inexpensive Bose in the rear and a Denon AVR-1712 receiver. I'm quite happy to review that I am extremely pleased with my purchase and feel that I've found a great quality subwoofer at a very fair price. With this, I feel like my entire sound system is 10 x better. You don't know what you're missing until you hear it for yourself. It's like I popped my ear cherry. Lol!
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    1 of 1 people found the following review helpful By David Moskowitz on July 4, 2013
    Verified Purchase
    I had the previous generation of this subwoofer but after a few years of serious use, the power amp finally quit. This model is only slightly larger than the model it replaced, but the difference in sound quality is very noticeable, and I thought the previous model was an excellent value.
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    Verified Purchase
    I got the front Infinity tower speakers last year and then I got the centre and this subwoofer to complete the front set. The whole set works wonderfully together, giving the right combination of full spectrum sound. The subwoofer has more than enough power to fill my 18' x 30' basement home theatre. Any louder would be uncomfortable.

    With this subwoofer, I can see, hear, and FEEL the movies.

    As a side note: The first one came broken. The inside was rattling and I didn't bother to take it out of the box. Amazon.com sent a replacement immediately and gave me 30 days to return the damaged one. It was inconvenient but Amazon sure made it good.
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