Skip Navigation

Infinity Primus PS312

Powered subwoofer

52 Reviews

Item # 108PS312BK

This item is no longer available.

Shop all Powered Subwoofers


Our take on the Infinity Primus PS312

Infinity's Primus PS312 powered subwoofer pumps up your movies and music with thunderous bass you can feel as well as hear. A massive 400-watt amplifier powers this sub's 12" woofer to fill even large rooms with punchy, well-defined lows. The combination of a patented Metal Matrix Diaphragm® driver and a low-resonance enclosure ensure this subwoofer can rock out without introducing any audible distortion.

Add more life to your movies and music

Infinity's Primus PS312 powered subwoofer pumps up your movies and music with thunderous bass you can feel as well as hear. A massive 400-watt amplifier powers this sub's 12" woofer to fill even large rooms with punchy, well-defined lows. The combination of a patented Metal Matrix Diaphragm® driver and a low-resonance enclosure ensure this subwoofer can rock out without introducing any audible distortion.

Infinity's exclusive Metal Matrix Diaphragm driver

The PS312 features Infinity's exclusive Metal Matrix Diaphragm ("MMD" for short) driver technology in the 12" front-firing woofer. It consists of a stiff aluminum core, anodized on both sides for increased strength and rigidity. The result is extremely fast, accurate response, giving you distinctly cleaner, more realistic bass, even at higher volume levels.

Product Highlights:

  • bass-reflex design
  • 400-watt RMS amplifier
  • 12" front-firing MMD® (Metal Matrix Diaphragm™) driver
  • frequency response 25-150 Hz (±3dB)
  • continuously variable 50-150 Hz crossover
  • phase switch
  • line-level stereo RCA inputs
  • unfiltered LFE (Low Frequency Effects) mode for connection to a home theater receiver's subwoofer output
  • auto on/off
  • black wood grain vinyl finish
  • 14-3/8"W x 17-13/16"H x 20-1/16"D
  • warranty: 5 years driver, 2 years electronics
  • Our 60-day money-back guarantee

What's in the Box:

  • Black powered subwoofer
  • 6.5' AC power cord
  • Back cloth grille (installed/removable)
  • Owner's Manual (En/Fr/Sp)

Outstanding performance This thing is so heavy and so reliable

Anthony, Brooklyn, NY


Infinity Primus PS312 Reviews

Average Customer Review(s):

(52 Reviews)


Anthony from Brooklyn, NY on 7/12/2017

Outstanding performance This thing is so heavy and so reliable

Pros: Heavy Power!!!! Reliable Built like a tank Completely adjustable U can fit ur fist in the back for easy cleaning lol

Cons: None Buy it already

Infinity Primus PS312

Kenny from Exeter, RI on 10/23/2016

Crutchfield Customer Review (What's this?)

Have a nice Cambridge Audio 100w receiver with thousand $ a pair Polks with all sources optically connected and I thought my music and movies sounded pretty darn good. I added this Infinity Sub and GOOD GOD! There is now an underlying rich layer of lows like a slathering of luxurious deep dark chocolate. ... or something like that ? Anyway, it's pretty damn awesome. I never knew what I was missing.

Pros: Low price. Clean rich sound. Plenty of power.

Cons: Kinda big but you can't have everything.

Outstanding Sub &^ Great Price

Bob from Dayton, OH on 10/23/2016

Crutchfield Customer Review (What's this?)

more than i expected, wonderful bass. replaced a 10" comparison, movies are more enjoyable...everyone has been impressed with it's outstanding performance and very reasonable pricing...thanks...

Pros: Auto detection, adjustable freq response, and volume adjustable, and great value

Cons: edges are fairly sharp as it's a wood cabinet, so placing is important...especially if small chidren could come into contact...edge protection is cheap and available at most hardware stores...

Tried two of them, both broke.

Anonymous from Rogers, AR on 10/4/2016

Great sub.....when it works. I purchased the original one about 10 years ago, it lasted 5 years then the internal amp when out. I thought it was a fluke .... plus it didn't have a surge protector on it. So i purchased the same exact sub, put a surge on it and guess what.... same thing. Amp it out. I only use this sub for my surround sound system in my living room but it is used daily. Its barely goes to half of the volume it is capable of. I will Not purchase this again. Buyer be ware. PS. It was a match set to my infintity system - all of the other compontents (including the 4 surround speakers and center channel) have worked flawless for 10 years. So I would buy infinity again, just not this same subwoofer.

Pros: Sounds great

Cons: Wont last. Both broke withtin 5 years.

The ps312.

gary from malin oregon on 7/11/2016

Crutchfield Customer Review (What's this?)

This 400 watt beast brings you're system to life. Don't be fooled buy the great price. Compared specs with many other brands that were way more money. If you're looking for a unit that can be loud as a volcano, but very subtle when needed. Pick this monster up. Thanks to my advisor for you're advice. Also tech support helped me tame the beast.

Pros: Price, power, warranty.

Cons: None.

Infinity Primus PS312

Bryan from Findlay, OH on 7/6/2016

Crutchfield Customer Review (What's this?)

This sub ROCKS and is a perfect match to my Infinity Primus 362 front speakers with the 351 center and 162 bookshelves as surrounds all powered by a Marantz SR 6010 Receiver. Doesnt matter if its in 2.1 or even in Dolby Atmos its all good. I like it so much I am thinking about adding a second sub just for Home theater use. This thing shakes the floor the walls ect. Major improvement over my previous sub.

Pros: Great sub with good options and power. I have not noticed any flabby bass or port chuffing since adding this to my system. Only running it about 60 % now. Watched Jurasic Park the other day could feel the floors in my Basement Home theater shaking along with the walls ect .

Cons: None

Infinity Primus PS312

markbayman from Brooklyn, NY on 5/15/2016

Crutchfield Customer Review (What's this?)

The Speaker has a great full sound with many options to adjust in the back. It was easy to set up and works well with the rest of my system.

Pros: Easy to set up, Great sound, works well with all systems.

Cons: I can't find anything to fit this question.

So much bass

Steve from Midlothian, VA on 4/3/2016

Crutchfield Customer Review (What's this?)

I only have the output knob turned to one quarter and I still can shake bottles off the shelf in the bedroom upstairs!

Pros: Good bass


Infinity Primus PS312

Thomas from cheyenne, WY on 2/28/2016

Crutchfield Customer Review (What's this?)

Such a great subwoofer to fit my Infinity surround setup and budget.... just need another one and I'll be set!

Pros: Great acoustic sounds produced by this subwoofer, reasonable pricing for the amount of bang for your buck, and it's about average size for a 12" subwoofer cabinet.

Cons: Might get evicted here soon... neighbors are going to hate me! Shake rattle and roll!

Great Sub.

James C. from Bakersfield, CA on 2/28/2016

Crutchfield Customer Review (What's this?)

Received the sub quickly. Purchased for a new home which is still under construction. The box was damaged by UPS but the sub and packaging were untouched and appears to be great. As I have another 30 days before moving in I have not set up the new 7.1 set up yet. However, I did open the sub, power it up and hood it up to my current system. I have had Klipsch and Cerwin Vega powered 12" in the past. This sub, out of the box with no break in period hits harder with powerful lows without fail. I cannot rate at 5 yet as I need to have a proper set up and install to see it's true potential.

Pros: Looks nice Plenty of power Great hits and lows

Cons: None yet

Get the 12"

RN from salinas, CA on 2/15/2016

Crutchfield Customer Review (What's this?)

Finally, some deep bass. Never had a 12" sub but now I'm happy I did. Can't even turn it all the way up. Too much, but movies are great. Jurassic World anyone?

Pros: Solid solid deep bass. Look.

Cons: Big enough that others will notice. haha

Infinity Primus PS312 Review

Anonymous from Stanford, CA on 2/14/2016

Crutchfield Customer Review (What's this?)

High fidelity, power and response. I'm happy with my purchase.

Pros: Good quality and performance, it works as advertised.

Cons: None so far.

Boom Boom

Kevin from Peachtree city, GA on 2/14/2016

Crutchfield Customer Review (What's this?)

This is my first subwoofer. It had good reviews on Crutchfield. I read about durability issues, and only time will tell. I watched Oblivion and the room shook! It made my music sound fuller. A good addition.

Pros: Strong bass....

Cons: None, so far.


darryll g from lewisburg wv on 2/6/2016

first of all thank you crutchfield you are best i am really happy with this sub movies sound fantastic and my music sounds out of this world i needed a upgrade and this sub was perfect i acutually drove from wv to charlottesville which is about 2 hrs and i could have gotten free shipping but i wanted to talk to the sales person my self and met him in person and it was the best decision i ever made thank you very much

Pros: love it love it love it

Cons: none what so ever

Earthquake simulator

Isaac from union, ME on 1/24/2016

Crutchfield Customer Review (What's this?)

This sub is better than anything I've ever heard. The bass is so clean that when recorded with a mic there is 0 distortion at all. Usually when there's a lot of bass you can hear a clapping sound, but there is none with this. I have knocked several things off my shelves, and the room outside my room has paintings on them that have to be straightened when I'm done listening to music.

Pros: Extremely clean bass, powerful, easy to setup, easy to change set the bass to how you want it (personally I like it as loud as possible).

Cons: There is nothing wrong with this, but if I was FORCED to complain about something... it's very heavy. When I use it I put it on my bed facing a corner, and when I'm done I take it off and put it in a different corner (so I can sleep, obviously).

house shaker!

barel from New Mexico on 1/4/2016

Crutchfield Customer Review (What's this?)

What an upgrade this is from the 8" Infinity sub I was running with my old system. This sub has been great thus far, watching various movies it absolutely makes the experience feel real! Thunder/lightning scenes, explosions, dinosaur chases - all are real life with this sub! And you don't have to push it like smaller watt subs to get the feel. Great deal as well on the open box/scratch and dent supply. Can't go wrong with the booming 12" Infinity sub!



Infinity PS312

James from Washington on 12/1/2015

Crutchfield Customer Review (What's this?)

Great Sound and it has not failed on me. It pounds Compared to the DT SuperCube 4000. Broke in great and still sounds really nice, and bumps tuff. Great sub for the coast.

Pros: Sound quality and range. Bumps harder then i thought it would.

Cons: none.

Here comes the boom!

NewM from Atlanta, GA on 10/1/2015

Crutchfield Customer Review (What's this?)

Was looking for strong bass to fill large home theater and this thing delivers. No issues with distortion, and actually have it dialed down a bit.

Pros: Great sound for home theater setting. Deep true bass. Good value.

Cons: None

Buy It!

K N from North Carolina on 7/12/2015

Crutchfield Customer Review (What's this?)

Replaced an older Infinity 12 inch sub that was downward facing with this one. This sub is much cleaner and louder than the previous one. More sound and less room rattle.

Pros: Great sound

Cons: None

Infinity Subwoofer

Anonymous from Simpsonville SC on 6/30/2015

Crutchfield Customer Review (What's this?)

Went from a 10" subwoofer to a 12", and I'm extremely impressed. Didn't think I would get that good quality sound. Great but for the price. Infinity makes good quality speakers!

Pros: Execellent

Cons: None

Happy w/my Lows

AdamD from California on 6/27/2015

Crutchfield Customer Review (What's this?)

Replaced an older, slightly smaller Infinity subwoofer with this one. The upgrade is noticeable and I'm glad I did it.



Infinity PS312 powered subwoofer

Derek from Irmo on 6/13/2015

Crutchfield Customer Review (What's this?)

This unit is replacing an Infinity powered sub (PS12) which is about 10 years old. I chose to go back with Infinity as the old unit rocked our large room with ease. Never had the gain past 3/4 and it shook the windows. However, with the PS312 I barely take it past half volume with the same effect. So I assume the amp will last longer in the 312 due to not needing to push it as hard. The bass is tight, deep, and you feel it in the seat of your pants, remnicant of a movie theater, just what you want in a powered sub. Very happy with the product and would recommend to anyone. Also the shipping was super fast. The box was beat up a bit, but the packaging from Infinity was top notch and had no damage inside.

Pros: Good looks, great sound, good value

Cons: Large unit, neighbors might complain

Booming Subwoofer!

Tom from Georgia on 5/17/2015

Crutchfield Customer Review (What's this?)

This is an excellent subwoofer! I already owned Infinity front and center channel speakers so, I elected to stick with infinity for the subwoofer. I have found Infinity to be very good quality and sound and this subwoofer does not dissappoint! I highly recommend it if you want ground shaking base and a classy looking speaker.

Pros: Quality look and sound!

Cons: None

Great Sub!

Anonymous from Denver, CO on 5/10/2015

Crutchfield Customer Review (What's this?)

This sub sounds great! I agree with all of the comments about having to turn the volume down. It fills up our very large room very well.

Pros: Price, sound quality, looks.

Cons: It is rather large

Expected a bit more

Seth from Florida on 5/2/2015

Crutchfield Customer Review (What's this?)

Bought this to replace a 12 year old infinity IL100 (ten inch) powered sub woofer that died on us. Because I was increasing to the 12 inch sub, I expected a little more from it. It works fine, just not as deep and clear as I had hoped for. I'm giving it 3 stars because replaced a smaller, older infinity sub woofer, and it fails to create a noticeable improvement.



Fantastic Sound - Questionable Quality

CliffordJ from Detroit, MI on 2/24/2015

Crutchfield Customer Review (What's this?)

Let me start off by saying that this thing sounds Awesome (5 stars). It woke up my home theater system. It fills up my basement entertainment room with strong, clear bass and rattles my house quite nicely. It is the perfect compliment to my system. However, the quality is quite suspect. I first bought this unit in March, 2013. It lasted until January, 2014 when the built in amplifier burned out. Fortunately, the unit was covered under warranty and it was replaced. The second unit lasted until February, 2015 (same failure mode). It, too was replaced under warranty. I am now on my third unit. Frankly, I am worried that this unit will last only about 10 - 12 months like the last two units. This time, I'll be out of the warranty period and I'll be on my own. I do not drive the unit hard at all as I like a balanced sound that is not too "bass heavy". There is no way the first two units should have burned out with the way that I ran them. This new unit was made in late 2014 so I am hopeful that Infinity got their quality act together and that this unit will actually last. So while I am still pleased with the sound of the unit, I am now wary of the quality. Until I know that the quality has been improved, I can't in good conscience recommend this sub woofer (0 stars for quality).

Pros: Strong, clear sound. More than enough power for my home. Crutchfield's service has been impeccable in helping me deal with the difficulties I encountered with this unit

Cons: Suspect quality (Two sub woofers burned out on me within 10 - 12 months. I am on my third unit now)

Excellent! 5+++ Stars

Chuck from Maryland on 2/22/2015

Crutchfield Customer Review (What's this?)

Exceptional power. Superb sound quality. Extremely Fast shipping! Just the right size - not too big. Will likely purchase another one exactly like it in the near future.



Very satisfied!!!

Tim from Upstate, NY on 1/24/2015

Crutchfield Customer Review (What's this?)

I finally decided to finish buying the Klipsch Reference series speakers. I have the 62's in front and 52 surrounds (5.1). I bought a new receiver rate at 100W/channel and found that my Sony powered sub simply couldn't keep up at all. After reviewing the options available with the helpful Crutchfield staff I chose this sub. Not only does it keep up with the other speakers, it is capable of overpowering them. I went from lacking, to being capable of too much. After some playing around with the crossover levels and volume controls with different sound sources I have it set up so it blends really well. I'm re-watching a lot of movies and listening to my favorite music and hearing sounds that I never knew was lacking before. Probably what impresses me the most is that even at low volumes levels the bass is still present. I am shocked at how much sound it produces for a single 12". I was accustomed to running around with 2-12" at 600W in my car (as a teen) and so I was not expecting as much as it is capable of. It hits hard and fast!!! It keeps up fast hitting sound tracks from my music CD's. I would buy this again without hesitation. I would recommend it to anyone interested. Well worth what I paid. I did choose the "scratch and dent" offer because I knew it would hard to see even were it a bad scratch. Turns out, if I didn't know to look, I wouldn't have noticed anything wrong. Performance is not affected at all.

Pros: capable of producing audible sound at low volume levels (where the Sony couldn't be heard) and yet when turned up, it is capable of producing A LOT of nice sounding bass at high volume levels.

Cons: I haven't found any yet. Although... it rattles all the pictures on the walls through the WHOLE house. oh, wait... that isn't a con... my bad.

Love it!!!

Jay from Mississippi on 1/2/2015

Crutchfield Customer Review (What's this?)

Ordered this product in anticipation of having my surround sound system installed. Once everything was up and running the Infinity Primus PS312 was simply the icing on the cake!!! Amazing have that deep bass in the background during movies or just rumbling with the music is AWESOME!!!!!! I highly recommend this product.

Pros: Nice deep bass sound. Great looking product.

Cons: I ordered this from the scratched and dented section. (The scratch was minimal). The only con I have was that the power cord wasn't in the box. I notified Crutchfield and a cord was immediately sent to me. If you order from the scratch and dented section be sure to ask Crutchfield to verify that everything that supposed to be in the in the box.

Infinity Primus PS312

philipgene from New Jersey on 1/2/2015

Crutchfield Customer Review (What's this?)

out classes anything in its price range outstanding sound reproduction

Pros: more than enough volume rock hard punch well crafted

Cons: no variable phase adjustment

ps 312 sub

dan from Alabama on 11/24/2014

Crutchfield Customer Review (What's this?)

first sub went out at 1 year old, Harman replaced it, second sub went out in 10 months, do not buy this sub. they will not last. I cannot believe that people rate this sub so high

Pros: nothing

Cons: made in china.

Infinity Primus PS312

Dennis from New Cambria, MO on 11/4/2014

Crutchfield Customer Review (What's this?)

Awesome product sounds great more power than most people need lol it rocks the house



sub woofer

bill from edgewater, fl on 9/29/2014

Crutchfield Customer Review (What's this?)

love this. it makes my home theater system rock out



Infinity PS312 subwoofer

Bruce from Rio Ranche, NM on 9/26/2014

Crutchfield Customer Review (What's this?)

Very well made. Smooth response. Gets down to the lowest octaves as advertised. Blends very will with the Polk wall speakers in our 7.1 surround system using a Denon receiver. Operates in a far corner of our great room (18x37 ft. with vaulted 12 ft. ceiling) via twisted pair plus shield and drain wire connection through our custom switch panel. Shield connected to ground at receiver end to configure unbalanced cabling connection. No hiss nor hum. Very nice product. So far have not shaken anything off surrounding shelves, but might try for this with the next rock and roll party (ha!).

Pros: Prompt delivery. Good packaging. No shipping damage. Excellent product!

Cons: None that I can think of.


Mashado from Chantilly, Va on 9/13/2014

Crutchfield Customer Review (What's this?)

This produces some insane bass. Shakes the heck out of my living room.



Infinity Primus PS312

Jay from FPO AE on 9/3/2014

Crutchfield Customer Review (What's this?)

I just love the deep sound for music and movies with my Sony 7.2 steroe

Pros: Great base to rock this 5000sq ft Villa



Terry F from Pueblo West, CO on 8/22/2014

Crutchfield Customer Review (What's this?)

Replaced a 200 watt Sony. The Infinity Primus PS32 was by superior!

Pros: This is my second sub from Infinity. Excellent!

Cons: None

Cool Story Bro

Pimp Master J from Norfolk, VA on 5/28/2014

Crutchfield Customer Review (What's this?)

Simply amazing.

Pros: When it's set to less than a quarter power, it fills my 15'x15' theater room with a 22' ceiling with subtle, full, CLEAN bass. When it's turned up 3/4 it shakes the room. I have not yet found a need to turn it up louder than half-way for any reason other than experimentation with vibrating the lights that hang from my ceiling.

Cons: None. Best home theater sub I've ever owned.

Infinity Primus PS312

Buck P from Closter, NJ on 4/16/2014

Crutchfield Customer Review (What's this?)

Liked this product a lot - it exceeded my expectations. Shook my livingroom without effort!

Pros: Excellent product

Cons: None


Bald VADER from Las Vegas, Nevada on 3/4/2014

Crutchfield Customer Review (What's this?)

We never realized how much bass we were missing with the old Polk Sub. I can not give you tech spec talk. But I can tell you that we had to adjust power to half after rattling all the windows and blowing my son out of an easy chair. Just like the "Blown Away Man".

Pros: Incredible clean sound. I can not hear my wife talking during the movie.

Cons: Infinity Sub Woofers do not come with recliner seat belts

great bass

lilsue from cleburne, TX on 2/1/2014

Crutchfield Customer Review (What's this?)

Love the bass, ease of set up & the appearance of cabinet. I have it set to 50%, any higher and it will crack the foundation :) It compliments my existing speakers (Energy-Connoisseur) to a Tee.

Pros: ease of set up, appearance, great sound.

Cons: it is HUGE!

Infinity Ps312 subwoofer

Mac from Indiana on 1/31/2014

Crutchfield Customer Review (What's this?)

This sub woofer is very good. It handles LFE's very well with clear crisp sound. I have the unit hooked up to an Anthem MRX 500 7.1 receiver with paradigm speakers. This sub woofer fits right into the system.

Pros: Clear, crisp LFE sounds.

Cons: I haven't found any yet.

excellent product!!!

Giankarlo from San Juan, PR on 1/27/2014

Crutchfield Customer Review (What's this?)

waaw realmente me encanta la bocina, suena bien clara y solido. Y Crutchfield!! los adoro!! ustedes son lo maximo super rapido el envio y free shipping 2nd day to Puerto Rico, so very nice!!! sound very deep and clear. If i need to buy it again, will do trust me. You will feel the air of the subwoofer running through your legs aah man what a great speaker. Wooow! I love this sub - it's got a solid, clean sound! And Crutchfield, you guys are awesome! You guys are the best - 2 day shipping to Puerto Rico, so very nice! If I need to buy it again, will do, trust me. You will feel the air of the subwoofer running through your legs! Aaah man, what a great speaker.

Pros: look, sound, size

Cons: mmmm well... noooothiing!! jaja really nada mmmm well... noooothiing!! Hehe, really, nothing.

Crutchfield response on 1/29/2014 Translation provided by Crutchfield's Spanish Sales & Support team. Visit our new Spanish-language site at

primus ps312

Jeff D from oakdale, ny 11769 on 1/24/2014

Crutchfield Customer Review (What's this?)

Very rich bass right out of the box. The ps312 replaced an infinity 15" sub that got fried during the sandy storm. I spent a lot of time reading reviews and getting input from others with surround systems. I came back to infinity because of how well the last sub preformed. This time I'm using a surge protector. Also, I'm using an onkyo receiver so, the set up and integration was simple. All in all I'm very happy with this sub and occasionally it goes on sale.

Pros: rich, complex bass. I didn't need a break in period that others have talked about.

Cons: none at this time.

Exactly as promised

Elecshop from Jacksonville, FL on 1/7/2014

Crutchfield Customer Review (What's this?)

I've been looking for a powered subwoofer to compliment my Bose Acoustimass 10 surround system for some time. I read the reviews for this item and no one anything critical to say about the performance or quality so I waited until the sale the item went on sale. When I received the item I was completely satisfied. Well worth the money at regular price .

Pros: Excellent sound and craftsmenship.



Mike from oak island, nc on 12/21/2013

Crutchfield Customer Review (What's this?)

This is my second infinity sub, I replaced a 150 watt with this beast and its awesome.... easily handles a load... huge upgrade for my man cave....

Pros: Quality

Cons: None

Infinity Primus PS312

stewartT from Little Rock, AR on 5/1/2013

Crutchfield Customer Review (What's this?)

This powered sub hammers deep low bass like a sledge hammer! I have owened a Klipsch ref12 and the infinity preforms stronger and deeper. I have a Yamaha Receiver, along with Cerwin vega bookshelf, and center channel speakers and Cv ve 15s for the front. I thought the vegas pumped out the bass, I can hear and feel the infinity over them. The vegas are powered 500 rms per channel through a Qsc gx5, and 3rd octave EQ with the 31.5hz gain up 4db. The Infinity is built solid also, and I like the way the grill extends out away from the woofer. I highly recommend it! buy one or two for your system, you will not need tower speakers. after hearing the Infinity center channel, and bookshelfs, I am making my whole system infinity.

Pros: compact solid design and easy to use.

Cons: In today world it's always the price is a drawback for most of us, but thats ok Crutchfield has this Item on sale often. So no cons on the Infinity Primus PS312!

Awesome Product and Awesome Customer Service

Mark from Hawaii on 4/23/2013

Crutchfield Customer Review (What's this?)

First off, I purchased the PS212 from outlet and after 2 weeks it started to make a rattling sound. Called Crutchfield Tech support and, without any hassle, gave me an option to return and get a refund or to upgrade to PS312. Of course, I upgraded and they also upgraded the shipping to 2day delivery. For people who live in Hawaii, 2day air is expensive for something that weights 50+ pounds but they said "sorry for the inconvience" and shipped it that day. Awesome tech and customer support. I will always buy from Crutchfield. About the product, I upgraded from a 6 year old 12" MTX audio home theater sub which is working still but I needed something with a little more tighter bass. I have the Infinity Primus towers, center, and rear surrounds which is the best for quality and price. Now I have the Primus Sub and its fantastic! The best home theater sub by far! No regrets going with Infinity and with Crutchfield!

Pros: 400 watts RMS. Not cheaply made. Bass is tight and accurate. Worth more than the cost!

Cons: None

Infinity Primus PS312

Ruben from Vega Baja, PR on 4/15/2013

Crutchfield Customer Review (What's this?)

Es una excelente bocina de bajo, muy poderosa y facil de instalar. This is an excellent subwoofer, very powerful and easy to install.



Crutchfield response on 4/17/2013 Translation provided by Crutchfield's Spanish Sales & Support team. Visit our new Spanish-language site at


Mike from MN on 3/24/2013

Crutchfield Customer Review (What's this?)

I am not one of those techy guys but I know a little bit about a little bit about audio tech.. This sub does everything that I want it to do. It does get a little distorted if you turn everything way way up but kind of to be expected I guess. I would buy another one if these if and when this one dies on me! :)

Pros: LOUD- if you want it to be

Cons: None. It's kind of big, but if you buy This sub you know what you are looking for.

Awesome Bang for the Buck

Joshua J from Minneapolis, MN on 9/28/2012

Crutchfield Customer Review (What's this?)

Growing up listening to movies and music through my JBL Soundgear 3030, I have always held Harmon International products in high regard. When it came time for me to finally assemble my own home theater system, I was expecting no less from these Infinity speakers. I've created a system of 4 P363's towers, 2 P163's bookshelfs, a C351 center, and a PS312 sub, all powered by a Harmon/Kardon AVR3650. Being a bargain hunter, I waited for these to go on "sale" to obtain the best price (well this side Black Friday sales prices). I have had the speakers hooked up for about two months now, and all I can say is WOW! The sound reproduction and tonal quality is incredible. Everyone has their own opinions on what sounds good, but ultimately the quality of the sound comes down to the quality of the receiver and the quality of the speaker components. I've utilized various mediums ranging from music, movies and video games, and in each medium, even with works I know quite well, comes alive- whether connected via HDMI, fiber optic or composite. There are qualities to the sound that I did not know existed- that is how incredibly clear the sound is. I would definitely recommend these speakers to someone looking to obtain the best sound for the price, while still having a high quality product.



Infinity Primus PS312

JoeH from Sedona, AZ on 6/28/2012

Crutchfield Customer Review (What's this?)

I really like my new sub woofer. It is a replacement for an older unit. This speaker sounds so much richer than the old one. It has changed the dynamics of my home theater system. I would highly recommend it to everyone.




Hands-on research

Features and Specs

Enclosure Bass Reflex
Video Shielded No
Woofer Size (inches) 12
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 50-150 Hz
High-Pass Crossover Freq N/A
Phase Switch Yes
Amplifier Output (watts) 400
Frequency Response 25-150 Hz
Height (inches) 17-13/16
Width (inches) 14-5/16
Depth (inches) 20-1/16
Weight 44.7 lbs
Speaker Parts Warranty 5 Years
Speaker Labor Warranty 5 Years
Amplifier Parts Warranty 2 Years
Amplifier Labor Warranty 2 Years

Product Research



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 PS212 is equipped with a front-firing, 12" M.M.D. woofer.

Amplifier: This subwoofer is powered by a 400watt (RMS) amplifier, rated at 35Hz - 150Hz with no more than 0.1% THD. The maximum (peak) power output is 700 watts.

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

Bass Port: There is one rear-firing bass port that allows 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.

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. The crossover is bypassed when the "LFE/Normal" switch is in the "LFE" position.

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.


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.

Q & A

Customer Q&A

Crutchfield asked  
Why did you buy this?

from the reviews that were posted. [ raymond  Nov 07, 2016 ]
I have primus surround sound speakers for my home theater and decided to add a second sub to the setup. [ Clark  Nov 03, 2016 ]
good reviews and my klipsch died after 1 year [ Robert  Oct 07, 2016 ]
The quality of Infinity at a great price. The reviews were great. [ Eileen  Sep 05, 2016 ]
advisor recommended for larger patio space [ Blake  Sep 05, 2016 ]
Good reviews, great value, good quality reputation with this brand. Harmon consumer electronics has a good name for making great sounding speakers at a value price [ Eric  Aug 08, 2016 ]
I was persuaded by the features and reviews. [ Michael  Jul 29, 2016 ]
By its features, brand and aftersales service commitment... [ Reynaldo  Jun 01, 2016 ]
All the speakers in my home theater system are infinity and am picky because I want them all to match. I also choose this because I wanted a more powerful subwoofer. I love thundering bass! [ Bobby Alan  Mar 22, 2016 ]
Old sub crapped out. Good experience with Infinity speakers in the past. Crutchfield has excellent customer service and delivers fast!!! [ S  Mar 21, 2016 ]
Price, spec and sound [ Antonio  Mar 11, 2016 ]
low freq response, front firing speaker, 12", auto on, good wattage [ Ray  Mar 08, 2016 ]
I had an Infinity sub base for about 12 years and it fried. I was happy with it so I bought another one. It is a great speaker, plenty of base, more than you need, good speaker [ Ben  Feb 14, 2016 ]
Price! Plus range of frequency and 5 star ratings review. [ Kevin  Feb 01, 2016 ]
I already own one of these subs and my new Dolby atmos receiver can use 2 subs. Pretty exited! [ Michael  Jan 31, 2016 ]
My old infinity woofer was messing up. [ richard  Jan 31, 2016 ]
cost, reviews , specs [ aussie chicago  Jan 31, 2016 ]
This sub has an unusually narrow width 14.5 (inches) for a 12 inch subwoofer - so it's the biggest powered sub that fits my narrow placement limitations. [ James  Jan 27, 2016 ]
Great product [ Neal  Jan 24, 2016 ]
Best subwoofer for the money. [ Luis  Jan 07, 2016 ]
Highly recommended subwoofer with the lowest frequency floor in the price range. [ John  Jan 06, 2016 ]
Trust in product name hopefully as good as PS212 [ Anthony  Jan 05, 2016 ]