Sony XS-L121P5

12" Component Subwoofer

  • Sony XS-L121P5


  • Sony XS-L121P5


  • Sony XS-L121P5

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Item# 158L121P5

Review Summary

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Our take on the Sony XS-L121P5

by Steven Johnson

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's imaginative "pentagonal" woofer brings big bass output to your sound system. Its five-sided design controls standing waves that can detract from sound quality. Plus, the polypropylene cone is more rigid, so it can handle serious bass without losing its shape.

This sharp-looking sub features a longer, four-layer, edge-wound voice coil for improved power handling. An all-aluminum voice coil former controls distortion by dissipating heat, while the triple-layered spider provides excellent cone suspension.

The XS-L121P5 12" subwoofer handles up to 350 watts RMS, and works well in sealed or ported enclosures.

  • five-sided polypropylene cone
  • rubber surround
  • frequency response 18-2,000 Hz
  • power range 90-350 watts RMS
  • peak power handling 1200 watts
  • sensitivity 89 dB
  • top-mount depth 6-5/16"
  • sealed box volume: 1.0 cubic feet
  • ported box volume: 1.58
  • Recommended Q-Logic Box Type: 1, 3
  • 1-year warranty

Priced per speaker


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

Features and Specs
12 -inch
4 ohms
Cone Material
Surround Material
Ideal Sealed Box Volume (cubic feet)
Ideal Ported Box Volume (cubic feet)
Port diameter (inches)
Port length (inches)
Dual Voice Coil
89 dB at 1 watt
Frequency Response
18 - 2000 Hz
RMS Power Range (Watts)
Peak Power Handling (Watts)
Top Mount Depth (inches)
6 5/16
Bottom Mount Depth (inches)
Cutout Diameter or Length (inches)
11 1/16
Vas (liters)
Fs (Hz)
Xmax (millimeters)
Parts Warranty
1 Year
Labor Warranty
1 Year
Product Research
What's in the box?

Download owner's manual

  • One 12" woofer
  • 1 Strip of self-adhesive foam
  • 10 Self-tapping screws
  • Installation/Connections sheet (English/French/Spanish)
  • Warranty sheet
  • Thiele/Small parameters sheet
  • Subwoofer Enclosure Recommendations sheet
  • "Stop" sheet
  • Template

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.

Enclosure Compatibility


P5 Cone Design: This woofer has a five-sided polypropylene cone. This design stiffens the cone, resulting in lower distortion and higher power handling.

Foamed Rubber Surround: The foamed rubber surround provides high power handling, enhanced cone control and flexibility. "Hash Marks" in the surround provide added stability.

P5 Center Cap: The five-sided dust cap adds strength to the cone assembly.

Inner Cap: The inner cap at the top of the voice coil former stabilizes the former's "roundness" and strengthens the connection between the cone and the former.

Dual Dampers: Three-layer woven dampers provide enhanced cone control and have the lead wires woven in to prevent shorting to the frame.

Four-layer Voice Coil: The four-layer, edge-wound voice coil provides plenty of copper to pass the current necessary for high power reliability.

Binding Posts: The gold-plated binding posts will accept bare wire, pin connectors, spade lugs and banana plugs. The binding posts are spaced too far apart to accept dual banana plugs.

Enclosure Compatibility: This woofer can provide extended bass in sealed and ported enclosures (please see the "Enclosure Compatibility" section for more information on the recommended enclosures).

Enclosure Compatibility

Recommended Sealed Box Volume: Sony recommends mounting this woofer in a sealed enclosure with an internal volume of 1.0 cu/ft.

Recommended Ported Box Volume: Sony recommends mounting this woofer in a ported enclosure with an internal volume of 1.58 cu/ft. A ported enclosure with an internal volume of 1.58 cu/ft uses one 3" diameter x 8" long port.

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Sony XS-L121P5 Reviews

Average Customer Review:

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Filter by rating:
5 out of 5

4 yrs and hitting still.

Written By Russ, NJ on Wednesday, December 10, 2008
These subs are awesome. Ive had my two subs for 4 years. They are in a nice sealed box and each has 1000 watts to them. They are still smooth and work perfect. Shame they are discontinued i wish i could afford 2 more.
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4 out of 5

Sony XS-L121P5

Written By stereo man, riverview FL on Monday, March 28, 2005
Crutchfield Customer Review (What's this?)
i have two of these in a 89 toyota pickup they sound ok but the distort when you turn it up loud and you can't really hear the subs because my mids have a higher db level than the subs
1 out of 2 people found this helpful
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4 out of 5

Above Average Subs

Written By Kevin, Statesville, NC on Sunday, February 27, 2005
I had these subs for about a year. They hit pretty good but they start to distort a little bit when you turn it up real loud. Though the distortion was limited i wanted something else. Good Starter Subs.
(Sony Xplod 1000 Watt Amp, In A Sealed Box)
5 out of 6 people found this helpful
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4 out of 5

they are alright

Written By ford man, fort morgan colorado on Thursday, February 24, 2005
they are alright but i have herd better and i am sure if you put them in a good box and hade enough power then they would probly get the jobe done
245 out of 340 people found this helpful
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For a more in-depth review and enhanced detailed information on the Sony XS-L121P5, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_158L121P5/Sony-XS-L121P5.html ).