Bring the bass! Infinity's new PS-8 powered subwoofer teams a 100-watt RMS amplifier with an 8" driver made from Infinity's exclusive Metal Matrix Diaphragm (M.M.D.) material. Derived from the C.M.M.D. material used in Infinity's flagship Prelude™ drivers, M.M.D. features a stiff aluminum core that provides exceptional strength and rigidity for clean, realistic low-frequency tones. It's great for enhancing music and adding room-rattling thrills to home theater listening. The crossover control and phase switch make it easy to match the PS-8's sound to the rest of your speakers. Get ready for dramatic, lifelike bass.


  • bass-reflex design
  • 100-watt RMS amp
  • 8" front-firing driver
  • frequency response 35-150 Hz (±3dB)
  • continuously variable 50-150 Hz crossover
  • phase switch
  • line-level stereo and LFE inputs
  • speaker-level inputs with binding post connectors
  • auto on/off
  • black woodgrain vinyl finish
  • 10-11/16"W x 17-7/16"H x 16-1/2"D
  • warranty: 5 years driver, 3 years electronics

Why add a powered subwoofer?

A powered subwoofer gives you bass you can feel as well as hear. Our customers love the depth and impact their subs add to music and movies. We hear comments like "it brings out sounds I didn't know existed in discs I've watched a million times." Powered subwoofers aren't just for big bass that rattles your picture frames; they can also deliver tight, accurate lows. If you haven't shopped for a powered sub in a while, you might be surprised at how small they get. Look for an ultra-compact model if you want to tuck your sub away under an end table or in a corner.

Hands-on research

What's in the box?

Download owner's manual

  • Powered subwoofer
  • Owner's Guide
  • Warranty sheet

Features and Specs

Enclosure Bass Reflex
Video Shielded No
Woofer Size (inches) 8
Woofer Composition M.M.D.
Firing Direction Front
Wireless No
Preamp-Level Inputs 3
Speaker-Level Inputs Yes
Speaker-Level Outputs No
Low-Pass Crossover Freq 50-150 Hz
High-Pass Crossover Freq None
Phase Switch Yes
Amplifier Output (watts) 100
Frequency Response 35-150 Hz
Height (inches) ---
Width (inches) ---
Depth (inches) ---
Weight ---
Speaker Parts Warranty 5 Yrs woofer/3 Yrs amp
Speaker Labor Warranty 5 Yrs woofer/3 Yrs amp
Amplifier Parts Warranty ---
Amplifier Labor Warranty ---

Product Research

Inputs and Outputs Notes


Metal Matrix Diaphragm (M.M.D.): Derived from the C.M.M.D. material used in Infinity's flagship Prelude drivers, M.M.D. features a stiff aluminum core that provides exceptional strength and rigidity for clean, realistic low-frequency tones.

Amplifier: The 8" M.M.D. front-firing cone woofer is powered by a 100-watt (RMS) amplifier.

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.

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

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.

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.

Inputs and Outputs Notes

Line-level Inputs: The subwoofer has a gold-plated LFE input 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.

Speaker-level Inputs: The left and right gold-plated 5-way binding posts allow you to connect the subwoofer to a receiver/amplifier using speaker wire.

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.

Infinity PS-8 Reviews

Average Customer Review:

7 reviews
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Infinity PS-8

Written By Nemesis, Massachusetts on Friday, January 10, 2014

Great sub!! Infinty rocks!!

Pros: Everything!

Cons: None!!

Great Sub For Music and Overall

Written By Jason, Louisville, KY on Monday, April 23, 2007

Crutchfield Customer Review (What's this?)

I auditioned the PS-8 and PS-12 (300W) side by side and my personal preference for music was the PS-8. I found the bass notes to be a little crisper and faster. The PS-12 seemed a little muddy with music although some of the low drum and really low sounds where more pronounced. Both of the subs are great, but I was surprised that in the end I preferred the PS-8. Great sub at a great price.

Don't be afraid to buy

Written By Greg, Tampa, FL on Sunday, December 24, 2006

Crutchfield Customer Review (What's this?)

Man, I have been buying and selling speakers and subs for several years now trying to find the "right ones". I bought this little sub for my bedroom with a pair of mirage omnisats thinking it would be great for a small room, make a long story longer, I had a 12" 650w in my livingroom with polk monitor 40's. I now have the infinty PS8 and mirage in my livingroom. Now I'm not saying the 12" and polk didn't sound great, if anything I'm just saying this sub is truly a great sub. It sounds much bigger than one would think. I also had a pair of infinty primus 150's with it for a while and that sounded great as well. I switched to the mirage purely because of the sound detail. However the 150's have better mids than the mirage and they are a great buy now.

So if you are looking for a great sub for small money do not hesitate, you won't be let down, I wasn't and I was very picky. My thoughts are that I don't mind spending the money as long as you get what you want and you're happy. I paid $500 for the 12" sub and paid $250 for the infinity sub, i can say the 12" wasn't worth twice as much. pound for pound I'd take the PS8 all day. Also for you kids on a budget, you don't need a $1500+ receiver to push your sound, a good $250-$500 receiver will put smiles on your face. I sold my pioneer receiver for this very reason. Just don't use a receiver that your dad had in the shed for 15 years. Good luck

Good starter sub

Written By David, Santa Barbara, CA on Tuesday, April 04, 2006

Crutchfield Customer Review (What's this?)

I just received my PS 8 subwoofer from Crutchfield. I added it to a pair of Infinity Primus 160 speakers and an Onkyo TX-SR 503 receiver. The new sub definately adds a dimension to the music. I'm hearing parts of songs that I never knew before. However, this sub does not go as low as others I have heard. It does not create sounds that will make the walls shake, or that you will feel in your tummy. It generates dull booms and thuds that are good for movie soundtracks or video games, but it is not good at recreating the sounds of musical instruments. The sound is fairly
distorted and it does not really sound like a double bass or even a drum.

I'm still saving up for my dream stereo, which will have a 12 inch Velodyne subwoofer. In the meantime, the PS 8 is good enough, especially since I live in an apartment and don't want to annoy the neighbors.

Plenty of Power

Written By Dave, Ithaca, NY on Thursday, March 30, 2006

Crutchfield Customer Review (What's this?)

It's probably true that you're not going to shake the walls of your neighbors house with this, but it does a surprising job for its size. My living room is 15' x 27' with cathedrial ceilings that are 9' at the wall and 13' at the peak. The living room has a ceiling high, 13' wide, "T" connection to another room which has the same ceiling and is 13' x 32' and I have no trouble filling the entire area with all the volumn I want (the rest of my system is a Primus C25 center flanked with 160s and 150s for rears).

Mixing speaker brands in one system

Written By Duane, Minot, ND on Saturday, January 28, 2006

Crutchfield Customer Review (What's this?)

I bought this subwoofer along with Bose 301 front speakers, Infinity 150 rears, Infinity center, Onkyo receiver. Got a very nice discount. Buying this subwoofer gave me additional % off on other speakers [Editor's note: limited-time offer]. And this subwoofer is plenty for my surround. Love it!
It complements everything very well.

Hits hard for 8"

Written By Crutch, Columbia, MO on Thursday, September 15, 2005

I've owned this for about 6 months now. It is amazing how mych sound this dub can produce. Very clean also, no distortion.

Get everything you’ll need to enjoy your new Infinity PS-8

A better cable will give your subwoofer the tools it needs to recreate the deep bass on your music and movies. Cable is not included with this sub.
Have your new equipment installed by qualified professionals.
If you're going to connect your sub to your receiver with the speaker level inputs, you're going to need speaker wire. Wire is not included with this sub.
If you're going to connect your sub to your receiver with the speaker level inputs, you're going to need speaker wire. You may also want to add connectors. Wire is not included with this sub.
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