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Helix Precision P8W

8" 4-ohm subwoofer

Item #: 975P8W

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High-end bass

Are you building a reference-level system in your vehicle? Helix created their Precision Series subwoofers for the mobile audiophile. Built from hand-picked components and assembled in Germany, these subs will create detailed low-end that perfectly complements a high-performance speaker system. From the tight, plucky punch of a bass guitar to the solid "thunk" of a kick drum, you'll be in sonic heaven with these subs.

Built tough

Helix was thinking a little outside the box when they designed the Precision P8W 8" subwoofer. They used Agave sisalana, an incredibly stiff natural fiber, coated in silk to create a lightweight, rigid cone that reproduces low frequencies with unerring accuracy. Combine this unorthodox cone with a seriously oversized voice coil, and you have a woofer that will handle up to 250 watts RMS without breaking a sweat. A big rubber surround takes a lot of abuse, while the die-cast aluminum basket won't add a hint of coloration to your bass. Don't be afraid to turn this sub up. For best results, mount this subwoofer in a ported enclosure.

To drive this single subwoofer, we recommend a mono amplifier rated between 200 and 375 watts RMS at 4 ohms. For more information, please refer to our article on How to Match Subwoofers and Amplifiers.

Product Highlights:

  • 8" subwoofer with 4-ohm voice coil
  • silk-coated Agave sisalana woofer cone with rubber surround
  • die-cast aluminum basket
  • frequency response: not available
  • power handling: 100-250 watts RMS
  • peak power: 500 watts
  • sensitivity: 87.2 dB
  • top-mount depth: 4-9/16"
  • ported box volume: 0.48 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.

Helix Precision P8W Reviews

Average Customer Review:

1 Review


Written by: UFO from Chicago on July 17, 2012

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

At first I thought, hmmm Helix??? This guy is trying to sell me some cheap off brand stuff. I was WRONG, from the first hit of bass the sound was deeper and tighter than my old sub-woofer and that was a good sounding speaker. This one is just better.

Pros: Quality and sound.

Cons: None at this time.

Hands-on research

What's in the box?

Download owner's manual

  • One 8" Subwoofer
  • Rubber gasket (installed)
  • Specification sheet (English/ German)

Product Research

Enclosure Compatibility


Cone Design: The woofer uses a rigid sisal fiber cone with a durable rubber surround. The mechanical advantages of sisal, rigidity and inner damping, result in faster transients and precise detail.

Cast Aluminum Basket: The die-cast aluminum basket resists flexing and resonance (ringing).

Terminals: The woofer features a pair of spring post terminals. They accept pin connectors or bare wire up to 10-gauge.

Enclosure Compatibility

Sealed Box: Although designed for a ported enclosure, the P8W subwoofer can also be used in a sealed enclosure. The optimum internal volume is 0.28 cubic foot. Sealed enclosures provide the most control over a woofer, will handle a lot of power, and provide accurate sonic reproduction, making them suitable to all types of music.

Ported Box: The recommended ported box has an internal volume of 0.48 cubic feet with a 3" diameter x 5" long port tube, giving a tuning frequency of 80 Hz and a -3dB point of 68 Hz. Ported (or vented) enclosures typically provide better overall efficiency than sealed so they are suitable for use with smaller amplifiers, giving you more bass output from less power.

Bandpass Box: When using a bandpass enclosure, the sealed rear chamber should be 0.58 cubic feet and the ported front chamber should be 0.26 cubic feet with a 2-3/4" diameter x 5-2/3" long port.

Our Product Research Team

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