Polk 10″ Subwoofer Ultramarine – White


Cutout Size = 8.8″ | Waterproof = No | QTY = Single | Mounting Style = Flush | Watts Max = 700 | Watts RMS = 350

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10″ Subwoofer Ultramarine – White

Polk’s marine subwoofers have always been known for intelligent design, impressive sound, and weather resistance. The UMS108 sub continues this tradition with solid construction that stands up to the elements.

The UMS108 is made to kick out deep bass under challenging conditions.  Its mica-reinforced polypropylene cone handles up to 350 watts RMS, and the stiffness of the cast aluminum basket gives you the clean, hard-hitting performance you expect from Polk.  This sub’s air-suspension design makes it suitable for installation in any panel of your boat without the need for an enclosure.  


  • Air Suspension Design
  • Cast Aluminum Basket
  • High Temp Voice coil
  • Snap On Grille Installation Option

Technical Specifications:

  • Sensitivity – 89.2dB
  • Max Power – 700W
  • 350 Watts RMS
  • Cut-out Dimensions – 8.8″
  • Mounting Depth – 5.71″

In the Box:

  • One (1) Subwoofer
  • Grille
  • Mounting hardware
  • Installation manual

∗Sold as an Individual 

WarningWARNING: This product can expose you to chemicals which are known to the State of California to cause cancer, birth defects or other reproductive harm. For more information go to P65Warnings.ca.gov.

Weight 17.6 lbs
Dimensions 14 × 14 × 11 in


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