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Sony XS-GSW121

GS Series 12" 4-ohm subwoofer

Item #: 158GSW121

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1 Review | 1 question - 1 answer

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Advanced materials

Sony XM-GS100 330W x 1 Subwoofer Amplifier

Sony created their GS Series subwoofers with performance in mind. Their XS-GS121 12" subwoofer features a unique mica-reinforced cellular glass fiber material that's foamed in a honeycomb fiber base, making it 10 times more rigid than a polypropylene cone. Sony formulated a surface layer for the cone that's made up of mica flake, synthetic fiber, and pulp, creating an extremely light and rigid cone that's able to move faster and more accurately. You'll hear greater precision and lower distortion.

Serious power handling for this price range

A rugged rubber surround helps this Sony sub handle up to 500 watts RMS, while a double-layered spider supports the voice coil for a 55% increase in cone travel over last year's model. The GS-121 is equally at home in a ported or sealed enclosure, so you can choose the sound you want for your system. And best of all, Sony backs up these workhorse subs with a cool 3-year warranty. If you want more bass in your space, Sony's ready to back you up. 

To drive this single subwoofer, we recommend a mono amplifier rated between 375 and 750 watts RMS at 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Product Highlights:

  • 12" subwoofer with 4-ohm voice coil
  • mica reinforced cellular glass fiber cone with honeycomb internal matrix
  • rubber surround
  • grille not included
  • power handling: 500 watts RMS (2000 watts peak power)
  • frequency response: 20-600 Hz
  • sensitivity: 84 dB
  • impedance: 4 ohms
  • top-mount depth: 5-5/8"
  • warranty: 3 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.

Sony XS-GSW121 Reviews

Average Customer Review:

1 Review


Written by: Brian k from Bend, OR on October 3, 2015

Crutchfield Customer Review (What's this?)

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

Great woofer over all

Pros: Sounds great

Cons: Need a ported box for this sub

Hands-on research

What's in the box?

Download owner's manual

  • One 12" Single voice coil woofer
  • Plastic trim ring
  • Adhesive backed foam gasket
  • Eight 1-1/4" Self-tapping screws
  • Instructions (multiple languages)
  • Warranty information

Product Research


Cone: The xs-GSW121 uses a honeycomb design MRC cone (Mica Reinforced Cellular glass fiber composite) to reduce weight and increase rigidity, delivering deep bass response.

Binding Posts: The binding post wire terminals will accept pin connectors, spade lugs, single banana plugs, and bare wire up to 10 gauge. The binding posts are spaced too close together to accept dual banana plugs.

Enclosure Compatibility: The xs-GSW121 is compatible with either a sealed or ported enclosure.

  • Sealed Box Volume: The ideal sealed box volume is 0.84 ft³.
  • Ported Box Volume: The ideal ported box volume is 1.37 ft³ with a 4" diameter and 11-1/8" long port.

Specification Note: Sony's rated power spec for the xs-GSW121 is 400 watts (derived using IEC 60268-5 standards). They also list the CEA 2031 compliant RMS power as 500 watts. We've adopted the 400 watt rating simply because it's the more conservative figure.

Trim Ring: If the sub is mounted without the cosmetic trim ring, the flange height is 0.241" and the mounting height is 0.6" (top mount).

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.

Customer Q&A

1 question already asked

We have not received any answers from other customers on your question. I would recommend reaching out to an Advisor by phone (1-800-324-9695) or online chat. They should be able to help answer your question. [ Krissy  Jun 29, 2014 ]  Staff