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If you appreciate value and performance, check out Boston Acoustics G1 subwoofers — you'll be hard-pressed to find comparable performance and features in other subs in this price range.

The G112-4 12" subwoofer's hefty foam surround allows plenty of cone excursion for deep, powerful bass. The sub's design optimizes performance in small sealed or ported boxes — perfect if vehicle space is tight. Integrated sealing gaskets ensure an airtight fit when mounted in a sub box.

This sub will hold up when you drive it hard, thanks to its heat-dissipating vents. Boston's SureSet™ system incorporates replaceable fuses that protect the sub from power overloads.

Product Highlights:

  • 12" 4-ohm subwoofer
  • co-polymer cone with foam surround
  • RadialVent cooling
  • SureSet overdrive protection
  • power range: 50-200 RMS watts
  • frequency response: 20-350 Hz
  • sensitivity: 87.7 dB
  • mounting depth: 5"
  • sealed box volume: 1.00 cu. ft.
  • ported box volume: 2.00 cu. ft.
  • warranty: 2 years
  • Our 60-day money-back guarantee

What's a component sub and why would I want one?

A component sub is simply a speaker that's designed to reproduce bass once it's installed in a compatible enclosure. Think about the impact of a movie soundtrack in a big theater or even in your own home HDTV setup. A component sub can add the same kind of power to the music in your car. And a car sub is not all about the boom that you hear on a street corner (although that's cool too) - you can pair a component sub with your choice of enclosure to get bass just the way you like it, from tight and punchy to fat and loose. And once you experience music in your car with a well-tuned subwoofer, you'll never go back.

Boston Acoustics G112-4 Reviews

Average Customer Review:

5 Reviews

Awesome Subwoofer!!

Written by: AJG from Spokane, Wa on March 13, 2012

  • "Coolness Factor"
  • Build Quality
  • Ease of Use
  • Sound Quality
  • Value

I have gone through 3 Alpine Type R's using the PDX1.600, after my warranty ran out on the Type R's. I saw that this was 1/2 off I had to order it because the price break was more than then actual sub itself, and have a set of Boston computer speakers that have never let me down! After receving the subwoofer I was a little sceptical because it looked pretty shallow, and the magnet was smaller then that of an Alpine Type E. After messing with the Gain on my amp I didn't even have to break it in cranked the gain to full and it RAILS in a sealed .95 box!!! I have to say its not quite as deep as a Type R (much bigger magnet and four times the price with warranty) but for a cheep sub it has really thrown me off! I probably will stick with the Boston brand from now on. Sweet sub, no regrets.

Pros: Takes all of the clean 681w my PDX can push through it.

Cons: Blew a fuse (fuses being the coolest idea ever) and had to unscrew it from the box to replace, kind of a pain, but WAY better then toasting the sub. Replaced with 5 AMP (instead of 4 AMP) and good to go all day!

NIce sounding Subwoofer

Written by: AaronF from southern NJ on September 19, 2011

Crutchfield Customer Review (What's this?)

I bought this sub a few weeks after I purchased Boston Acoustics speakers for my 1994 Mercedes-Benz C280, It had the bose system, but I replaced it. The speakers sounded great on their own, but needed some help down low, so when I saw this sub on sale, i couldn't resist. It has a low RMS rating, which was perfect for the 4ch amp (MB Quart) I was going to be using to power the speakers and the sub off of. Speakers get 50wRMS a piece , and the sub is at a perfect 200wRMS. Overall the sub puts out plenty of nice sounding clean bass in the Sound Ordnance sealed enclosure that came free with the sub.It's Not going to be heard outside of the car, but inside is very nice sound, that actually hits pretty hard.I'm Highly impressed with Boston Acoustics' products.



Boston Acoustics G112-4

Written by: EBS from Orlando, fl on June 28, 2009

I have a pair of these in a 06 Kia Spectra SX sedan. They are in a dual sealed box/enclosure and they are wired in parallel. I have them powered by an Orion Cobalt CO 800.1 amp. These subs are getting 400 watts each and they have never let me down yet. They sound good with all types of music and they are more of sound quality subwoofer and not a SPL sub like the Kicker CVR for example. If you want a sound quality system then go with these but if you are bass head then go with the Kicker CVR. Also I went with these subwoofers because I do not have to reseal my rear [back] windshield every time. This is good sub for house music because I listen to it all the time.



Boston Acoustics G112-4

Written by: Squadfer from Houston, TX on May 26, 2009

I've been playing electric bass guitar/upright bass and tuba for 7-9 years now so I know what bass is suppose to sound like in its natural acoustic form. This sub replicates the natural sound of bass with great clarity. Most of the time when you hear other sub's you just hear vibrations without the clarity of it being a single note. Right now I have this sub in an enclosure that I built to the specs of the sheet that came with the speaker and I'm running a kenwood 200 RMS to the sub. For rock and country music this sub is really clear and just accents my door speakers without being overkill. On rap and electronica this sub will let you know that it is inside your car. For me having the two completely different styles of music being played through the same sub without sacrificing one style for the other style is a really big plus.



Decent, but Nothing Special

Written by: tower from Houston, TX on November 21, 2008

Boston's entry level 12" sounds okay, but can't take a whole lot of power. Its only real perk is its shallow mounting depth, allowing it to fit into slim
truck boxes easier than most subs (thinner than a JL 12W1). My biggest complaint would be the fuses they put on them, which are supposed to prevent you from blowing them, but end up just being a pain.



Hands-on research

What's in the box?

Download owner's manual

  • One 12" woofer
  • 1 Rubber gasket (installed)
  • 8 Self-tapping screws
  • Specifications sheet
  • Warranty sheet
  • Product Registration card

Product Research

Enclosure Recommendations


RadialVent Cooling Technology: The Boston Acoustics G1 series subwoofers feature patented RadialVent cooling technology, which directs airflow around the 2-inch/4-layer voice-coil for increased power handling.

Materials: The G112-4 woofer has a co-polymer woofer cone with a raised polypropylene dustcap and a large foam surround. The wrap-around gasket gives you a good seal whether you top-mount or bottom-mount the woofer.

SureSet: The speaker terminals are equipped with two 4-amp mini ATC fuses, which provide voice-coil protection under transient conditions such as accidental momentary overdrive.

Note: The fuses do not protect against voice-coil failure resulting from long term high power abuse.

Terminals: The woofer has rugged spring post terminals that accept up to 8-gauge bare wire or pin connectors.

Long Excursion: The woofer has a 1-3/4-inch peak-to-peak excursion for accurate deep bass output from a small sealed enclosure.

Enclosure Recommendations

Sealed Enclosure: The G112-4 woofer is optimized for use in a small sealed enclosure with a 1.0 cu. ft. internal volume.

Ported Enclosure: The woofer can also be used in a 2.0 cu. ft. ported enclosure with a 4" diameter, 13" long port, tuned to 34Hz.

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.