Polk Audio DXi 108

Ported enclosure with one 8" DXi Series subwoofer

  • Polk Audio DXi 108


  • Polk Audio DXi 108

  • Polk Audio DXi 108

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Item #: 107DXI108

Review Summary

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Original price $149.99

Our take on the Polk Audio DXi 108

by John Pollard
Polk Audio

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.

Get ready to rock

Go ahead, circle the parking lot until your favorite song is over. The bass from this Polk DXi 108 loaded enclosure will make you want to hit "repeat" so you can hear it all over again. Polk uses a high-tech approach and ideal materials to give your tunes an exciting new edge.

DXi Series 8" sub — precise engineering where it counts

The enclosure houses a DXi Series 8" sub with a stiff polypropylene cone and Santoprene rubber surround, so you can ride the bass wave for years to come.  Engineers at Polk analyze drivers in motion to ensure that cone movement is even and precise, so you'll get impressive thump with minimal distortion. Polk also uses laser imaging to craft a well-balanced cone that delivers superior accuracy. And this sub's 2-ohm impedance will draw maximum power from your mono amp.

Sturdy housing for your bass beats                                                 

Polk DXi 108

This Polk sub houses a DXi Series 8" driver that handles up to 180 watts RMS.

Read more

Polk houses the 8" sub in a ported enclosure that's a perfect sonic match. Advanced internal bracing provides a rock-solid platform for this sub, so you'll get nice, clean bass.  Specially engineered slot ports limit air turbulence while increasing bass production, so you can crank it up when you're in the mood. Pair it with the right amp and wiring, then strap yourself in for impressive bass from this extremely compact enclosure.


  • ported enclosure with one 8" DXi Series subwoofer
  • 3/4" MDF construction with front-panel ABS trim
  • polymer composite woofer with Santoprene rubber surround
  • 2-ohm impedance
  • frequency response: 30-200 Hz
  • power handling: 50-180 watts RMS (360 watts peak power)
  • sensitivity: 90 dB
  • 15-3/4"W x 12-3/8"H x 14-1/8"D1 x 11-3/4"D2
  • warranty: 1 year
  • Our 60-day money-back guarantee

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

Features and Specs
Woofer Size (inches) 8
Woofer Material Polypropylene
Enclosure Type Ported
Color Black
Pieces in System 1
Width (inches) 15-3/4
Height (inches) 12-3/8
Depth (inches) 14-1/8
Second Depth (inches) 11-3/4
Connector Type Spring posts
Frequency Response 30-200 Hz
Power Range (Watts RMS) 50-180
Maximum Wattage 360
Sensitivity 90 dB
Impedance 2 ohms
Parts Warranty 1 Year
Labor Warranty 1 Year
Product Research
What's in the box?

Download owner's manual

  • Single black subwoofer enclosure loaded with an 8" DXi subwoofer
  • Owner's manual (English/ French/ Spanish/ German/ Italian/ Portuguese)
  • Online product registration information

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.


Overview: The Polk Audio DXi108 is a single enclosure, loaded with a single 8" DXi subwoofer.

Enclosure Design: The enclosure is made of heavy duty 3/4" MDF (medium-density fiberboard), internally braced for strength and to eliminate resonance. The enclosure is covered with high quality, automotive-grade black carpet.

Front Baffle: Instead of a grille, the DXi112 has a heavy duty front baffle to protect the woofer. The baffle is made of rigid, automotive-grade ABS, which can be painted to match your vehicle's styling. In front of the baffle is an Elastomeric damping material to isolate the ABS trim from the baffle, and to act as a gasket to seal the woofer.

Port: The enclosure is vented with a slot-loaded port to reduce air turbulence (and noise) at the mouth of the port.

Driver: The DXi108 is loaded with a single 8" DXi subwoofer. The polypropylene woofer cone is stiff for quick-responding, punchy bass. It is built to withstand the demanding automotive environment. The woofer's rubber surround can withstand humidity, extreme temperatures, and long exposures to sunlight to give you years of performance.

2-ohm Rating: The woofer is rated at 2 ohms to bring out the best performance from high quality Class D subwoofer amplifiers.

Note: You should make sure your amplifier can operate safely with a 2 ohm load.

Woofer Design: The DXi108's woofer is designed using a state-of-the-art Klippel laser analyzer. The perfect alignment of the voice coil, motor structure, and suspension provides optimum performance with low distortion and a flatter response. The high-temperature, 4-layer voice coil is well ventilated for better power handling.

Terminal: The nickel-plated spring post terminal will accept pin connectors, single banana plugs, and bare wire up to 10-gauge.

Preconditioning Period: The DXi108 will achieve optimum performance after a short break-in period. It is recommended to play the DXi108 at moderate levels for 20 to 30 hours to reach the highest level of performance.


  • Frequency Response: 30 Hz - 200 Hz
  • Power Handling (RMS): 180 watts
  • Power Handling (Peak): 360 watts
  • Efficiency: 90dB
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Polk Audio DXi 108 Reviews

Average Customer Review:

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4 out of 5

this sub/ box does its job well

Written By sonnyd, london ky on Friday, December 27, 2013
i put it in a 2 dr blazer the sub/box it came in is perfect with the air space for just enough bass to let people know your coming
vocal quality price and space youll save
had to buy an amp also haha
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5 out of 5


Written By Susan, Mochigan on Monday, April 08, 2013
Crutchfield Customer Review (What's this?)
Who needs a bigger sub? This one delivers well at a smaller size! Quality over quantity!!
Smaller size Own enclosure Great sound
2 out of 2 people found this helpful
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5 out of 5


Written By Billy, Massapequa Park, NY on Friday, February 15, 2013
Crutchfield Customer Review (What's this?)
Unbelievable sub. I have it powered with the sound ordnance M-1350 and it sounds unbelievable. I wasnt a heavy bass guy, but now I am. I think anybody will be surprised as to how powerful this 8" really is.
Very powerful
Obviously I'd prefer it to be a smaller size, but not complaining.
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For a more in-depth review and enhanced detailed information on the Polk Audio DXi 108, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_107DXI108/Polk-Audio-DXi-108.html ).