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Infinity Primus PS38

Powered subwoofer

107 Reviews | 3 questions - 16 answers

Item # 108PS38BK

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Overview

Our take on the Infinity Primus PS38

One of the benefits of working here is getting to audition a wide range of equipment. I loved the Infinity PS38 powered subwoofer so much that I bought two of them. I use one in my home theater for thunderous special effects. Despite its modest price and relatively small footprint, it delivers incredible performance for my movies and video games. I use the other for my computer's 2.1 audio system. It blends smoothly with my bookshelf speakers for crisp musical bass. 

Rock-solid bass that won't break the bank

Infinity Primus PS38 powered subwoofer

The Infinity Primus PS38 gives you deep bass at a great price.

One of the benefits of working here is getting to audition a wide range of equipment. I loved the Infinity PS38 powered subwoofer so much that I bought two of them. I use one in my home theater for thunderous special effects. Despite its modest price and relatively small footprint, it delivers incredible performance for my movies and video games. I use the other for my computer's 2.1 audio system. It blends smoothly with my bookshelf speakers for crisp musical bass. 

Infinity's exclusive Metal Matrix Diaphragm driver

The Primus PS38 features Infinity's exclusive Metal Matrix Diaphragm ("MMD" for short) driver technology in the 8" front-firing woofer. It consists of a stiff aluminum core, anodized on both sides for increased strength and rigidity. The result is extremely fast, extremely accurate response, giving you distinctly cleaner, more realistic bass, even at higher volume levels. The woofer is housed in a low-resonance enclosure and powered by the sub's built-in 150-watt amplifier. It all adds up to bass that stays clear and accurate, even when you crank it up.

Build a complete Primus® system

The Infinity Primus PS38 will fill most rooms with dramatic and well-defined bass. Connect it to your receiver using either the LFE or line-level inputs. Easily accessible controls on the back of the sub help you blend it in with the rest of your system. The Primus PS38 is voice-matched with the entire Primus home theater speaker lineup, so you can create a high-quality sound system that meets your needs.

good sound for my medium sized room, makes a subtle but huge difference if that makes sense

Anonymous, Alexandria

What's in the Box:

  • Black powered subwoofer (with attached 69" AC power cord)
  • Black cloth grille (installed)
  • Owner's Manual

Product Highlights:

  • Metal Matrix Diaphragm® driver minimize distortion
  • 8" front-firing MMD driver
  • bass-reflex (ported) cabinet design
  • 150-watt RMS amp
  • frequency response 35-150 Hz (±3dB)
  • continuously variable 50-150 Hz crossover
  • phase switch
  • auto on/off
  • line-level stereo and LFE inputs
  • black woodgrain vinyl finish
  • 10-5/8"W x 17-3/4"H x 16-3/8"D
  • weight: 31.7 lbs.
  • warranty: 5 years speaker, 2 years amplifier
  • Our 60-day money-back guarantee
Reviews

Infinity Primus PS38 Reviews

Average Customer Review(s):

(107 Reviews)
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Details

Hands-on research

Features and Specs

Enclosure Bass Reflex
Video Shielded No
Woofer Size (inches) 8
Woofer Composition M.M.C.
Firing Direction Front
Wireless No
Preamp-Level Inputs Yes
Speaker-Level Inputs No
Speaker-Level Outputs No
Low-Pass Crossover Freq 50-150Hz
High-Pass Crossover Freq N/A
Phase Switch Yes
Amplifier Output (watts) 150
Frequency Response 35-150 Hz
Height (inches) 17-3/4
Width (inches) 10-5/8
Depth (inches) 16-3/8
Weight 31.7 lbs
Speaker Parts Warranty 5 Years
Speaker Labor Warranty 5 Years
Amplifier Parts Warranty 2 Years
Amplifier Labor Warranty 2 Years

Product Research

Features
Controls
Connections

Features

Metal Matrix Diaphragm (M.M.D.): Derived from the C.M.M.D. material used in Infinity's flagship Cascade series, M.M.D. features a stiff aluminum core, anodized on both sides for increased strength and rigidity. M.M.D. transducers conduct sound faster than paper, polypropylene, and Kevlar, pushing unwanted resonances beyond the operating range of the transducer. M.M.D. drivers deliver crystal-clear, distortion-free sound from dynamic digital sources, even at high listening levels. The PS38 is equipped with a front-firing, 8" M.M.D. woofer.

Amplifier: This subwoofer is powered by a 150-watt (RMS) amplifier, rated at 35Hz - 150Hz with no more than 0.1% THD. The maximum (peak) power output is 300 watts.

Surround: For a smoother response and improved durability, the woofer uses a rubber surround.

Bass Ports: There are two rear-firing bass ports that allow deep bass with high acoustic efficiency and low distortion.

Controls

Gain Control: The subwoofer has a rotary control on the rear panel for adjusting the level of the bass.

Low-Pass Crossover: The subwoofer features a continuously variable 50Hz-150Hz low-pass crossover that determines the highest frequency at which the subwoofer reproduces sounds. The crossover has a 24dB/octave slope.

Note: The crossover is bypassed when the "LFE" input is used.

Phase Switch: The subwoofer's phase switch allows you to control the phase of the subwoofer's output relative to the front speakers. If the bass sounds muddy or unclear, toggling the phase control can sometimes strengthen the bass "attack."

Auto On/Off Circuit: The auto on/off circuit turns the power amp on when a signal is sensed and turns the amplifier off and into standby mode approximately 10 minutes after a signal is no longer received. An LED indicator on the rear panel glows green when the amplifier is on and red when the amp is in standby.

Connections

Line-level Inputs: The subwoofer has a gold-plated LFE input (single RCA) and gold-plated stereo RCA inputs. If you have a Dolby Digital/DTS receiver or processor with a low-frequency-effects (LFE) output, you should use the LFE input on the subwoofer. If your receiver/processor does not contain a Dolby Digital or DTS processor but has a subwoofer output, you must use the stereo RCA inputs. If the receiver/processor has a mono subwoofer output, a "Y" adapter is recommended to maximize performance.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

Accessories
Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

Crutchfield is one of the most reliable places with fair prices on their products. [ JASON  May 15, 2016 ]
good brand, right price [ Matthew  May 14, 2016 ]
Complement for my Infinity speakers ,quality and good reviews . [ Norberto Rivera  Apr 13, 2016 ]
I've owned infinity powered subs in the past and i'm happy with the product. [ dwayne  Mar 30, 2016 ]
Not satisfied with my current set up, need to add some punch to my system. [ Rodney  Mar 23, 2016 ]
Had to replace an existing sub. Apparently they can't handle the occasional lightning strike...haha Was very satisfied with the one that failed, & expect the same from the new one. [ Ronald  Mar 16, 2016 ]
Reviews were good. [ Joseph  Mar 11, 2016 ]
Our old Sub broke and friend recommended the PS38 as a replacement. We love it the sound in better than our old Sub [ william  Mar 04, 2016 ]
Recommendation [ SCOTT  Feb 29, 2016 ]
Power output, size and reviews [ Matthew  Feb 21, 2016 ]
Talked things through with my advisor, Adam, and he pointed me to these, which had a special price running. I need a little more compact unit and my room is not that large. Adam's Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=39 [ STEPHEN  Feb 17, 2016 ]
Thorough research found the Infinity Primus PS38 powered subwoofer to be high quality at a value price. It should be a great addition to my upgraded home theater system. [ William  Feb 17, 2016 ]
good reputation. friend recommended. [ BRIAN  Feb 06, 2016 ]
Great Product at a good price. It's just what I was looking for [ David  Feb 05, 2016 ]
I purchased the PS38 around a year ago for my living room, and am satisfied enough with the sound quality and performance to add a second one to my bedroom. [ THOMAS A  Feb 01, 2016 ]
I bought the same product a while back, still works perfectly. Getting another for my second surround system. ( A good compliment for my Infinity Primus floor standing/ cabinet/ center channel speakers) [ Marciano  Jan 27, 2016 ]
Amazing Bass [ GERARDO  Jan 26, 2016 ]
For its outstanding performance, and cost. [ Jose R.  Jan 15, 2016 ]
Good reviews, good value. [ John  Dec 30, 2015 ]
To replace my infinity 10" woofer, and plus all my other surround speakers are infinity. [ Patrick  Dec 27, 2015 ]
sent back for the def tech prosub 1000 [ JOHN  Dec 19, 2015 ]
Matches my speakers & good reviews [ MICHAEL J  Dec 19, 2015 ]
reviews/Rocky recommendations [ Daniel  Dec 11, 2015 ]

3 questions already asked

I wouldn't recommend setting on its side because the vibration from the base could move the sub and and distort the sound. Polk audio makes a small sub that will work. [ jason  May 15, 2016 ]
I have never tried to use it on its side, so I can't be sure. It was not designed to be used that way. Maybe call the company and ask them, if they have a technical assistance phone number. Good luck. [ Scott  May 13, 2016 ]
I would think the sub would work well on its side, although I have not tried that position myself. Possibly a concern of resonance associated with the flat cabinet side and the floor. I would suggest adding stick-on rubber feet to separate the side of the cabinet from the floor [ Mark  May 13, 2016 ]
Yes, the Sub will work fine with your speakers. [ Bryan  Mar 07, 2016 ]
If you mean RCA..Nope. [ Norberto Rivera  Nov 15, 2015 ]
No [ LUIS E  Aug 19, 2015 ]
No, it does not come with any audio cables. [ SKYLER  May 15, 2014 ]
No. Nothing comes with it. [ DAVID A  Dec 30, 2013 ]
No, you will need to purchase a sub woofer cable for this unit. [ JAY  Dec 30, 2013 ]
No, it doesn't. [ JOHNNY  Dec 30, 2013 ]
I can't remember for sure but I think there was no cable provided [ DAVID B  Dec 30, 2013 ]
Cable not included. [ DAVID  Dec 30, 2013 ]
No cable. But good value for the money. Very musical sub. [ NICHOLAS W  Dec 30, 2013 ]
You will need to supply a decent subwoofer cable with good shielding, the shorter the better. [ MIKE W  Dec 30, 2013 ]
No cable is included most electronic stores carry the proper cable if your receiver has Dolby digital you need the lfe cable otherwise you must use rca's [ DAVID J  Dec 30, 2013 ]
no [ GARY  Dec 30, 2013 ]
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