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Polk Ultramarine UMS108B

Ultramarine Series 10.8" 4-ohm subwoofer with RGB LED lighting (Black)

Item # 522UM108BR

Polk's Ultramarine Series sub stands up to the elements, and its LED lighting makes it look as good as it sounds

Polk's Ultramarine Series sub stands up to the elements, and its LED lighting makes it look as good as it sounds

California customers:
Please click here for your Proposition 65 warning.

Item # 522UM108BR

Ships free today

Low stock
$309.99 each

Other options

About the Polk Ultramarine UMS108B

Great looks, great sound

Polk's marine subwoofers have always been known for intelligent design, impressive sound, and weather resistance. Their UMS108 sub continues this tradition with solid construction that stands up to the elements, and RGB LED lighting so your system looks as good as it sounds.

Great looks, great sound

Polk's marine subwoofers have always been known for intelligent design, impressive sound, and weather resistance. Their UMS108 sub continues this tradition with solid construction that stands up to the elements, and RGB LED lighting so your system looks as good as it sounds.

Rugged components 

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. And with ASTM certifications for salt-spray and UV exposure, it'll stand up to life on the water.

Light up the night

This sub features RGB LED lighting installed in the sub's grille to give you visual appeal to match the musical intensity. With Polk's XKGlow lighting controller (sold separately) you can program the lights for a custom display; the sub's lighting can also be controlled from your smartphone using Polk's free phone app. 

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Product highlights:

  • 10.8" 4-ohm subwoofer
  • mica/polypropylene composite cone
  • butyl rubber surround
  • cast aluminum basket
  • certified for marine use
  • power handling: 350 watts RMS
  • peak power handling: 700 watts
  • frequency response: 20-2000 Hz
  • sensitivity: 89.2 dB
  • cutout diameter: 8.8"
  • top-mount depth: 5.71"
  • warranty: 1 year
  • Our 60-day money-back guarantee
  • MFR # UMS108BR

What's in the box:

  • One marine subwoofer
  • Trim ring
  • Grille
  • Template

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More details on the Polk Ultramarine UMS108B

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Product Research

Features

Marine-Tested: The speakers are subjected to ASTM B117 (Salt Fog) and ASTM D4329 (UV exposure) testing to ensure they meet marine industry standards.

LEDs: There are multi-color LEDs in the back of the fixed grille, to create a glow on the woofer cone. To control the lighting, Polk recommends using the XKGlow Bluetooth controller (sold on Polk Audio's Ultramarine web site) with their XKChrome universal smartphone App (available for Apple and Android devices). If you prefer, the plug on the LED power wires can be cut off and the speakers wired to a 12 volt power supply, through a switch and fuse, or to a different brand controller. (The wires are not labeled, so this will require some testing to connect correctly.) Depending on what combination of wires is connected, the LEDs can light red, green, blue, yellow, pink, aqua, or white.

Grille: In addition to the fixed spoke style grille on each speaker, snap on plastic trim rings and grille covers are included to install if you like.

Note: The packaging indicates the trim rings are not designed to be removable once installed.

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Customer Q&A

1 question already asked

Q
I have your Polk ultramarine ums108 subwoofer. What is the 12vdc amp draw, for wire sizing?
[ john  Dec 02, 2019 ]
1 answer
A
Hi John, thank you for your question. In order to calculate amp draw, we would need information regarding the amplifier you're using, or planning to use with this subwoofer. Typically speaking, using a 4 gauge amplifier wiring kit, and a 14 or 12 gauge speaker wire, would be recommended when using an amplifier that can deliver 350 watts of constant power at 4ohm, which is what this subwoofer's recommended needs are. Feel free to chat with us online or by phone at 1-800-324-9695, they will be happy to assist you with any other questions you may have.
[ Jess  Dec 26, 2019 ]  Staff

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