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Infinity Primus PS312

Powered subwoofer

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  • Infinity Primus PS312

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  • Infinity Primus PS312

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  • Infinity Primus PS312

    Shown without included grille

 

Our take on the Infinity Primus PS312

by Dave Bar
Infinity

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.

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.

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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

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
Enclosure
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Bass Reflex
Video Shielded
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No
Woofer Size (inches)
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12
Woofer Composition
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M.M.C.
Firing Direction
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Front
Wireless
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No
Preamp-Level Inputs
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Yes
Speaker-Level Inputs
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No
Speaker-Level Outputs
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No
Low-Pass Crossover Freq
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50-150 Hz
High-Pass Crossover Freq
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N/A
Phase Switch
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Yes
Amplifier Output (watts)
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400
Frequency Response
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25-150 Hz
Height (inches)
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17-13/16
Width (inches)
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14-5/16
Depth (inches)
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20-1/16
Weight
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44.7 lbs
Speaker Parts Warranty
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5 Years
Speaker Labor Warranty
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5 Years
Amplifier Parts Warranty
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2 Years
Amplifier Labor Warranty
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2 Years
Product Research
What's in the box?

Download owner's manual

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

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 open the box, verify contents, 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.

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 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.

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. 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.

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.

 
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Infinity Primus PS312 Reviews

Average Customer Review:

15 people say:

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Filter by rating:
5 out of 5

Cool Story Bro

Written By Pimp Master J, Norfolk, VA on Wednesday, May 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.
1 out of 1 people found this helpful
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5 out of 5

Infinity Primus PS312

Written By Buck P, Closter, NJ on Wednesday, April 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
1 out of 1 people found this helpful
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5 out of 5

ANAZING POWER

Written By Bald VADER, Las Vegas, Nevada on Tuesday, March 04, 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
3 out of 3 people found this helpful
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5 out of 5

great bass

Written By lilsue, cleburne, TX on Saturday, February 01, 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!
3 out of 3 people found this helpful
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5 out of 5

Infinity Ps312 subwoofer

Written By Mac, Indiana on Friday, January 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.
1 out of 1 people found this helpful
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5 out of 5

excellent product!!!

Written By Giankarlo, San Juan, PR on Monday, January 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 Wednesday, January 29, 2014
Translation provided by Crutchfield's Spanish Sales & Support team. Visit our new Spanish-language site at www.crutchfieldenespanol.com:
2 out of 2 people found this helpful
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5 out of 5

primus ps312

Written By Jeff D, oakdale, ny 11769 on Friday, January 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.
1 out of 1 people found this helpful
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5 out of 5

Exactly as promised

Written By Elecshop, Jacksonville, FL on Tuesday, January 07, 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.
1 out of 1 people found this helpful
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5 out of 5

Quality

Written By Mike, oak island, nc on Saturday, December 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
2 out of 2 people found this helpful
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5 out of 5

Infinity Primus PS312

Written By stewartT, Little Rock, AR on Wednesday, May 01, 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!
3 out of 3 people found this helpful
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5 out of 5

Awesome Product and Awesome Customer Service

Written By Mark, Hawaii on Tuesday, April 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
4 out of 4 people found this helpful
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5 out of 5

Infinity Primus PS312

Written By Ruben, Vega Baja, PR on Monday, April 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 Wednesday, April 17, 2013
Translation provided by Crutchfield's Spanish Sales & Support team. Visit our new Spanish-language site at www.crutchfieldenespanol.com:
2 out of 2 people found this helpful
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5 out of 5

Holy BOOMER

Written By Mike, MN on Sunday, March 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.
2 out of 3 people found this helpful
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5 out of 5

Awesome Bang for the Buck

Written By Joshua J, Minneapolis, MN on Friday, September 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.
8 out of 9 people found this helpful
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5 out of 5

Infinity Primus PS312

Written By JoeH, Sedona, AZ on Thursday, June 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.
14 out of 15 people found this helpful
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Add accessories for the Infinity Primus PS312

Use a high-quality subwoofer cable for bass that draws you into your movies and music. A cable is not included with this sub. See all categories & accessories

Monster Cable® 600sw Subwoofer cable (4 meters/13.2 feet)
20 people say
Your Price: $59.95
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Monster Cable® 400sw Subwoofer cable (4 meters/13.2 feet)
29 people say
Your Price: $39.95
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AudioQuest Black Lab Subwoofer cable (16 meters/52.5 feet)
2 people say
Your Price: $104.99
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CableTruth 303S Subwoofer cable (9 ft.)
1 person says
Your Price: $29.99
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AudioQuest Irish Red Subwoofer cable (12 meters/39.4 feet)
Your Price: $179.99
Add to Cart
AudioQuest Boxer Subwoofer cable (2 meters/6.6 feet)
Your Price: $159.99
Add to Cart
Panamax MD2 Space-saving surge protector with two outlets
7 people say
Your Price: $39.99
Add to Cart
AudioQuest NRG-2 High-quality replacement AC power cable (6 ft.)
7 people say
Your Price: $168.99
Add to Cart
2 people say
Your Price: $3.99
Add to Cart
AudioQuest FLX-X RCA Y-Adapter 1-male-to-2-female audio Y-adapter
2 people say
Your Price: $16.94
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AudioQuest Hard RCA Splitter 1-male-to-2-female audio splitter
3 people say
Your Price: $12.94
Add to Cart
AudioQuest X2 Speaker Cable 14-gauge cable, connectors optional (30 feet, White)
19 people say
Your Price: $58.99
Add to Cart
AudioQuest G2 Speaker Cable 16-gauge cable, connectors optional (30 feet, White)
17 people say
Your Price: $38.99
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MartinLogan SW2-TRD Wireless subwoofer adapter kit
Your Price: $199.99
Add to Cart

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For a more in-depth review and enhanced detailed information on the Infinity Primus PS312, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_108PS312BK/Infinity-Primus-PS312.html ).

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  • 5 out of 5: In Stock
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  • Infinity Primus PS312
  • Infinity Primus PS312
  • Get details
  • $399.99
  • After $100.00 Price Break
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