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Add some punch to your vehicle's sound system with Focal's Polyglass SB 27 V1 loaded sub enclosure. This rugged box features 5/8" medium-density fiberboard construction that'll stand up to serious sound pressure levels. The ingenious flared port design keeps that distracting vent chuffing noise out of your music, while maximizing your bass output.

The SB 27 V1 enclosure houses a single Polyglass 11" 27 V1 sub, which handles up to 250 watts RMS. However, this box is far more than a one-note wonder — you'll hear accurate, deep bass that'll bring out the strengths of whatever music you enjoy. Focal assembles these boxes by hand so you know they'll provide reliable thump from the first beat. Pair this handsome package with a compatible amp and some wiring, then find out how a good sub system can transform your commute.

Product Highlights:

  • ported enclosure with one Polyglass 11" 27 V1 subwoofer
  • 5/8" MDF construction
  • 11" 4-ohm subwoofer
  • power handling: 50-250 watts RMS (peak power: 500 watts)
  • sensitivity: 90 dB
  • frequency response: 38-500 Hz
  • 18-1/2"W x 12-7/16"H x 14-3/8"D1 x 7-1/2"D2
  • warranty: 1 year
  • Our 60-day money-back guarantee

Enclosed Subwoofers 101

An enclosed subwoofer is a box with a subwoofer already installed. The advantage to buying an enclosed sub is that the manufacturer made the sub, then designed and built the box as a perfect match, so you'll get the best possible performance. Every enclosed sub has a maximum RMS power handling rating, so pair it with an amp with a similar RMS power rating to get the best performance.

Focal SB 27 V1 Reviews

Average Customer Review:

1 Review

Best sub I've had

Written by: Coty DLux from Louisiana on March 25, 2013

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

I've tried a few different subs in my Mazda 3 hatchback car and none of them can hold a candle to this one. I've tried 2 8" w0 JL's, A 10" Dayton Audio RSS265HF, a Kicker comp 10" and 2 Kicker comp 12" It's no comparison. You get good punchyness but still gets low.

I don't listen to music so loud that people can hear me a mile away so if you are looking for attention go buy a JL or some other High Output sub. This sub is musical and it brings my tunes to life. I listen to a variety of music from the Philharmonic Orchestra to Dillinja, this sub is perfect for all of it!

Pros: Sounds fantastic! size, shape, and craftsmanship.

Cons: Quite pricey.

Hands-on research

What's in the box?

Download owner's manual

  • Bass-reflex enclosure with 11" loaded subwoofer (cloth grille attached)
  • 2 Nylon mounting straps
  • 4 Metal mounting brackets
  • 8 Mounting screws
  • User Manual (Eng/Fre)
  • Template
  • FOCAL logo sticker
  • Serial number card

Product Research


Overview: The FOCAL Polyglass SB27V1 is a bass-reflex subwoofer enclosure with a 11" loaded FOCAL Polyglass 27V1 subwoofer and a flared port. This subwoofer enclosure provides high dynamic bass and high power handling in order to reach extremely high sound levels.

Bass Reflex Enclosure: The FOCAL SB27V1 features a bass-reflex enclosure with a front-firing flared port. The flared port is designed to reduce air noise. The enclosure is made of 5/8" MDF and features internal damping material for added rigidity and less vibration noise. The enclosure also features a removable cloth grille to protect the woofer's cone. In addition, the subwoofer enclosure utilizes nickel-plated spring-post terminals for easy connection of your speaker wire (up to 10AWG). The FOCAL SB27V1 presents a 4-ohm load at its speaker terminals. The subwoofer enclosure features four rubber feet and comes with a mounting kit which consists of two nylon straps, four metal brackets and eight screws to secure the enclosure in your vehicle.

11" Subwoofer (Polyglass 27V1): The FOCAL Polyglass SB27V1 features a loaded, front-firing 11" SVC 4-ohm FOCAL Polyglass 27V1 subwoofer. The FOCAL Polyglass 27V1 features an 11" polyglass cone woofer for a wide, dynamic frequency response of 36-500Hz that offers great bass and mid-bass sound. The uniform deposit of hollow-glass microballs over the entire cellulose pulp cone greatly increases its rigidity without adding significant weight, so you get a woofer that is durable, yet efficient, and sounds great. The woofer also features a NBR (Nitrile Butyl Rubber) surround for long excursion, deep bass, and added durability to promote long life. The Polyglass 27V1 woofer features a 4 layer, 2.0" diameter, 4-ohm, aluminum voice-coil former for higher power handling capabilities up to 250 watt (RMS) and 500 watt (Peak). The Polyglass 27V1's Louvered Cooling System is a self-regulated ventilation system which increases air cooling, prevents heat build-up, and provides optimized reliability with performance consistency. The Polyglass 27V1 woofer features a120mm (4.75"), 25mm (1") thick ferrite magnet for higher sensitivity up to 90dB (2.83V/1m). In addition, the FOCAL Polyglass 27V1 features a die-cast Zamak chassis which is a rigid, non-magnetic, and non-resonant frame that provides a strong, reliable structure for the woofer.

Our Product Research Team

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Product reviews from the Crutchfield Labs

Video: Introduction to Focal car audio
by Zak Billmeier, Ken Nail

Crutchfield's car audio experts Ken and Zak present an overview of Focal car audio products. Focal is a leading name in high-quality sound and Crutchfield is proud to have them in our lineup.

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