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Polk Audio MM651UM

6.5" 2-Way Ultra Marine Certified Mobile Monitor MM Series Coaxial Car Speakers

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with warranty

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Arrives by Monday, Jan. 23 to zip 20147

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General Features:

  • 6-1/2" Ultra Marine Mobile Monitor MM Series 2-Way Marine Speakers
  • Power Handling:
    • Peak: 400 watts per pair / 200 watts each
    • RMS: 200 watts per pair / 100 watts each
  • Recommended power range: 15 - 110 Watts RMS per channel
  • Completely sealed front designed for protection against water instrusion
  • Meets ASTM international B117-03 and D4329-99 marine standards
  • Passed 600 hours of salt fog and UV testing to meet international marine standards
  • Woven glass composite cone woofer
  • Butyl rubber surround
  • 1" Soft dome weather resistant dynamic balance tweeter
  • Built-on grille with tweeter mount
  • Sealed crossover assembly is built into the back of the magnet
  • Klippel optimized components for the strongest performance even at high listening levels
  • 4 ohm impedance
  • 1-3/8" (30mm) Large diameter voice coil
  • Neodymium magnet structure
  • Sealed crossover assembly built into back of magnet
  • Stainless steel heavy duty input terminals and mounting hardware
  • Salt, fog and UV Resistant
  • Top-mount depth: 2-5/8"
  • Authorized Internet Dealer
  • 90 Day Manufacturer's Warranty

Priced Per Pair


Second Depth
The second depth is used only when the box is slanted or angled. This value is the top measurement and it is measured in inches.
The front-to-rear depth of the item, in inches. If the item is angled or slanted, this value is the bottom measurement.
The height of the item, measured from top to bottom, in inches.
The width of the item from left to right (side-to-side) measured in inches.
Color of handle.

Warranty and Return Policy

Parts Warranty Duration
90 days
Labor Warranty Duration
90 days
Warranty Provider

Summary of Customer Ratings & Reviews

Rating Distribution

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1 Star

Average Attribution Rating

Browse 10 questions and 40 answers
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Why did you choose this?
Sonic Electronix Store
I normally buy Bose everything. However, the Bose marine speakers got horrible reviews, whereas these Polk speakers won the Gold Award this year for best marine speakers.
Connie K on Jun 10, 2016
rated top 6.5 inch marine speaker for 2015/2016
Dan E on Nov 19, 2015
Good reviews at a good price.
Timothy B on Nov 21, 2015
Excellent sound quality and price
Thomas J on Nov 15, 2015
looking to buy these speakers to go with mm521speakers in my boat, any recommendation on an amp to match these speakers and my 521s too? with possible sub added later without needing 2 amps. 8in max space for sub size.
A shopper on Oct 16, 2014
· Add Answer · I Have This Question Too (6)
whats the difference between mm651 and mm651um (ultra marine)?
A shopper on Oct 16, 2014
· Add Answer · I Have This Question Too (5)
looking a buying Polk Audio MM651UM are they new?
Dwane H on Jan 14, 2015
Best Answer: Hello Dwane,

Our awesome customer, Kevin, beat us to the response; All products on the website are BRAND NEW , unless otherwise specified.
Reply · Report · Customer SStaff on Jan 14, 2015
· Add Answer · I Have This Question Too (1)
what size speaker wire would be optimal for these speakers?
A shopper on Oct 24, 2014
Best Answer: Hello,

We would Prefer 12 Gauge, IF manageable for your particular install. Otherwise, 16 Gauge will suffice. Needless to say, we Always recommend OFC Wiring.
Reply · Report · Customer SStaff on Oct 25, 2014
· Add Answer · I Have This Question Too (1)
Polk Audio MM651UM / can the grills be removed I want to put these in a street glide fairing?
Bobby B on Sep 25, 2014
Best Answer: The Grilles are fixed and the built in crossovers are wrapped around the magnet in a plastic cover so they need mounting depth. They are infinite baffle so they need open airspace behind them. They do sound great and handle power tho
Reply · Report · dave m on Sep 29, 2014
· Add Answer · I Have This Question Too (0)
What is the true overall size of these speakers? I plan to mount them in tower pods that only have room for a 6.5" overall diameter.
A shopper on Jan 28, 2015
Best Answer: I can't remember did thi back in August sorry
Reply · Report · John M on Feb 11, 2015
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Will these fit a 2013 FLHTC?
Frankie on Mar 13, 2016
Best Answer: Not sure as I installed these in my boat.
I had a 2004 Ultra Classic and they would not have
Reply · Report · Thomas M on Mar 13, 2016
· Add Answer · I Have This Question Too (0)
can you put these speakers in a enclosure? if so what type of air volume is required for a sealed enclosure?
remps on Jun 16, 2015
Best Answer: Thank you for the recent inquiry!

After researching this specific product, unfortunately we don't have the necessary information to assist you. Due to the limited information at our disposal, we're not in the position to provide you with the answer you're seeking. Therefore we invite you to contact the manufacturer directly for additional support. Since they have additional resources at their disposal, they're much better equipped to aid in your request.
Reply · Report · Rick MStaff on Jun 16, 2015
· Add Answer · I Have This Question Too (0)
Are white protective covers available for these speakers?
Walt H on Feb 6, 2015
Best Answer: Hello Walt,

Polk Audio does not have such an accessory for their speakers.
Reply · Report · Customer SStaff on Feb 7, 2015
· Add Answer · I Have This Question Too (0)

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Sonic Electronix Wiring Guide

Wiring Diagram Legend

Warning: The image depicted shows the resistance change when wiring multiple subwoofer terminals. Please refer to your subwoofer's owner's manual for the proper wiring of its terminals. Sonic Electronix, Inc. is not responsible for damage caused to your audio system or vehicle due to improper installation. Please call tech support at 1-877-289-7664 if you require additional assistance.

Product Name: Polk Audio MM651UM