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Infinity Primus PS38BK 8" Powered Subwoofer - Black Single

  • 35Hz - 150Hz (±3dB)
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The Infinity Primus Series – Where Infinity sound begins.

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. Most other speaker systems in the Primus price range sound as if they are spraying their sound at you – tinny, hollow and reproduced – a copy of a copy. With its MMD transducer technology and seamless component architecture working in unison to eliminate unwanted resonance modes, the Infinity Primus PS38BK doesn’t spray – it immerses, rolling over the listener with warm, rich sound – the way live music does. Combine the Primus PS38BK with any one of Infinity’s powerful MMD-equipped floorstanding loudspeakers or bookshelf speakers, and the Primus PS38BK will fill any room with dramatic and well-defined sound. This is where Infinity sound begins, and it’s well within your reach.

  • newegg The Infinity Primus PS8BK – Not Just Loud: Accurate The secret to a good powered subwoofer is its accuracy and clarity. 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.
  • newegg Primus, Where a Home Theater Begins The Infinity Primus PS38BK is the perfect home theater companion. Give any film score that extra rumble and that powerful bombast. Experience the cacophony of your favorite battle or chase scene with the clarity and soul of a movie theater experience. The Primus PS38BK brings long-term, plug-and-play, trouble-free enjoyment to home theater – unheard of at this price point – and it is the perfect complement to any 5.1- or 7.1-channel home theater system.
  • newegg MMD Transducer Technology Derived from Infinity’s 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, the manufacturer is able to significantly improve cone performance and outperform cones made of paper, polypropylene or Kevlar material. By virtue of its extreme rigidity and resistance to resonance, 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.
  • newegg Superior Infinity Engineering 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.
  • newegg 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.

Learn more about the Infinity Entertainment Group PS38BK




Sold As
Driver Units
Low-frequency driver: Single 8" (200mm) MMD
Frequency Response
35Hz - 150Hz (±3dB)
Dimensions & Weight
17.88" x 10.63" x 16.50" (454mm x 270mm x 419mm) / 31.7 lbs. (14.4 kg)


Powered subwoofer

150 watts RMS

300 watts peak

50Hz – 150 Hz. 24dB/octave continuously variable

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

Advanced MMD transducers significantly improve cone performance, providing ideal rigidity and resistance to precision sound across the entire spectrum

Black Wood-Grain Enclosure

Manufacturer Warranty

5 years limited
5 years limited

Quick Info


  • Limited Warranty period (parts): 5 years
  • Limited Warranty period (labor): 5 years

Customer Reviews of the Infinity Entertainment Group PS38BK

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  • Keith S.
  • 9/19/2011 9:57:14 AM
  • Tech Level: High
  • Ownership: 1 week to 1 month
  • Verified Owner

5 out of 5 eggsAwesome!

Pros: Price! Got this during a sale and am I glad I jumped at it. This replaced a ten year old 10 inch sub from another manufacturer. I got this model to save some space, but was surprised at how much better it sounds over the old one. The bass is much cleaner allowing me to keep the gain level on medium and still get a good kick.

Cons: None

Other Thoughts: I have the receiver managing the crossover frequency and so I have the dial on the sub turned all the way to the max. Nice that this model has the LFE jack on it which is something the old model didn't have. Very happy with my purchase.

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