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Polk Audio MM651UM

6.5" 2-Way Ultra Marine Grade Mobile Monitor MM Series Coaxial Boat Speakers

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List price $279.95

$229.95

with warranty

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  • 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
  • Woven glass composite cone woofer
  • Butyl rubber surround
  • 1" Soft dome weather resistant dynamic balance tweeter
  • Completely sealed speakers for marine use
  • Built-on grille
  • Sealed crossover assembly is built into the back of the magnet
  • Klippel distortion analyzer
  • 4 ohms impedance
  • 1-3/8" (30mm) Large diameter voice coil
  • Neodymium magnet structure
  • Stainless steel heavy duty input terminals and mounting hardware
  • Salt, fog and UV Resistant
  • Top-mount depth: 2-5/8"
  • 1-year SonicElectronix.com warranty

Priced Per Pair

Speaker Specifications

Series
This is the manufacturer product line of speakers.
MM / Mobile Monitor (Polk)
Priced Per
Car Speakers are typically sold in pairs so you will receive 2 speakers for each speaker purchase on speakers marked "Priced Per Pair". If a speaker is marked "Priced Per Each" then the speaker is sold individually and each purchase you make will result in 1 speaker. High-powered tweeters, midrange and full-range pro audio for car speakers are typically sold per each speaker.
Pair
Speaker Size
Refers to the size of the speaker measured in inches. Every vehicle has standard application sizes. Please use our vehicle fitment guide for your vehicle's specific speaker sizes if you do not know them.
6-1/2"
Design
The number of individual drivers in a car speaker. Speakers with 2 drivers are known as a 2-way, and 3 drivers are known as a 3-way. Component systems are often referred to as "separates" because the tweeter is not attached to the midwoofer (main speaker driver) and mounts separately in a location such as a door post. Component systems typically come with an external crossover so you can easily adjust the high and low frequencies sent to both the midwoofer and the tweeter. Center channel speakers are great for those looking to have surround sound in their vehicle.
2-way
Tweeter Design
Designs such as cone, dome, semi-dome, balanced dome, and whizzer are most popular. Cone tweeters are simple, efficient and typically are the most reasonably priced. Dome tweeters are used in most home speakers, and provide a smoother and more accurate sound. Semi-dome design is one with a dome placed inside a cone. A Balanced dome driver is a semi-dome with equal reproduction area given the cone and dome portions of the driver. A whizzer tweeter is a separate tweeter cone driven by the voice coil of the woofer.
Dome
Tweeter Composition
Materials such as polypropylene, silk, cloth, and paper are the most common, where as many more recent tweeters are now manufactured with composites such as Aluminum, Titanium, Mylar, and other materials.

PEI is an acronym for "Polyetherimide" which is an amorphous, amber transparent, high-performance thermoplastic.

Silk-Polymer Composite
Woofer Composition
Lightweight woofer cone materials are essential for efficient operation. Poly cones produce exceptional sound and are sturdy against various changes in temperature. Paper cones are very efficient, and when treated for moisture resistance, will perform at a high level. Poly refers to polypropylene, which is thermoplastic or fibers that are polymers of propylene. IMPP refers to injection molded polypropylene, a commonly used process and material in speakers.
Woven Glass Fiber
Woofer Surround
A speakers surround is part of the suspension system. The surround protects the cone and prevents it from being displaced as it flexes out from the basket. It is usually made of a durable material like treated foam or rubber in order to withstand the strenuous job of producing bass frequencies.
Butyl Rubber
Peak Power Handling
Peak power handling refers to the amount of power a speaker can handle during a brief musical burst. The RMS power range figure is a much more reliable rating for determining the speaker's power requirements. The Peak power handling specification is typically rated per speaker unless otherwise noted.
200 watts
RMS Power Handling
The RMS power is the amount of power the speaker requires to operate safely and properly. RMS Power Handling refers to the amount of power a speaker can handle on a continuous basis. We recommend powering your speakers or subwoofer with 80%-120% of its recommended RMS rating. The RMS power handling specification is typically rated per speaker unless otherwise noted.
100 watts
Sensitivity
An efficiency or sensitivity rating tells you how effectively a speaker converts power into sound. The higher the number, the more efficient the speaker and the louder it will play with the same input power. An efficient speaker helps you maximize your available power. Most sensitivity ratings measure the speaker's output with 1 watt of input, 1 meter from the speaker. Some speakers' sensitivity is measured with 2.83 volts of input, instead of 1 watt.
 
Efficiency (1w/1m) is not an accurate indicator of a subwoofer's output capability and should not be used as a comparison to other speakers or subwoofers to determine which one is "louder".
92 dB
Frequency Response
The range of frequencies the speaker will reproduce (lowest frequency to the highest). Bigger is better, meaning the wider the range, the better. The optimal range is 20 - 20,000 Hz (which is the range of human hearing).
40 - 25000 Hz
Impedance (Per Voice Coil)
The load value (in ohms) that the speakers present to the amplifier per voice coil - the amount of resistance to the current flow. This is a key specification as subs wired in parallel or low impedances can create problems with your amplifier and potentially void all warranties. We encourage you to ask our support department prior to purchase if you do not understand which impedance level will suit your application best.
4 ohms
Top-Mount Depth
The depth when installed on top of the mounting surface. Measured from the bottom of the speaker's magnet to the bottom of the mounting holes on the rim of the speaker.
2-5/8"
Bottom-Mount Depth
The depth when installed from the bottom of the mounting surface. Measured from the bottom of the speaker's magnet to the top of the mounting holes on the rim of the speaker.
2-7/8"
Cutout Dimensions
Refers to the dimensions of the hole, measured in inches or millimeters, required to contain the speaker.
5-1/16 x 5-1/16 

Warranty and Return Policy

Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix

Summary of Customer Ratings & Reviews

Rating Distribution

5 Star
82%
4 Star
9%
3 Star
0%
2 Star
9%
1 Star
0%

Average Attribution Rating

Durability
4.5
Value
4.6
Features
4.6
Design
5.0
Usability
4.7
Jason

Denham springs, LA

Overall
Durability
Value
Features
Design
Usability
Great product!!!!

May 19, 2014

These speakers are a really great buy, sound great and look great Strongly suggestion buying these. I plan on buying another pair. The guys at Sonic Electronic were very helpful and order was received very quickly Thanks again

0 of 0 found this helpful

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Davey

Canada

Overall
Durability
Value
Features
Design
Usability
Great Marine Speaker!

March 6, 2014

I am a JL Audio guy all the way, but these speakers beat the M series JL Marine speaker on Top Ten Reviews so I had to try them out! They deliver! They are clean, clear and Crisp. And they Bump! Insane base response. For the price you cant go wrong!

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lowtones

Rohnert Park

Overall
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Value
Features
Design
Usability
Pok Audio MM651UM Marine Speakers

September 17, 2013

I purchased these as upgrades to the stock speakers in my boat. These are exposed to the elements on every outing. I am actually overdriving these speakers with more power than recommended so as to have the headroom for a clean, undistorted sound from my amp. And these speakers handle it beautifully. They have a remarkable low end for their size and as I adjust the crossover on my amp, the speakers do not seem to have a dead spot. So much so that I have adjusted my crossover to accommodate the sweet spot of my Kickers because these Polks can handle the full range. I wish the grill offered a little more protection but it would do so at the expense of sound quality so I'm very happy with these!

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Greg

Canada

Overall
Durability
Value
Features
Design
Usability
Great SOUND

June 18, 2013

Great speakers, look great and sound great. standing up so far.

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Donnie E.

Santa Clarita, CA

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Value
Features
Design
Usability
Great marine speakers. Onboard crossovers, great sound.

March 26, 2013

This coax's have dedicated crossovers that are attached to speaker itself. Gets loud and plays clear. Comes with everything you need to install.

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jackson lake ooogah club

covington ga

Overall
Durability
Value
Features
Design
Usability
you get what you pay 4

February 1, 2013

installed 4 in my 98 mariah talari last season and very pleased. paired them with an jbl amp and the clarity/volume is very very good. i did blow 1 tweet towards the end of the seaon.[sitting still,90+heat,direct sunlight,at near full power for extended ammount of time] but that was my error.the only real problem is that the magnet housing is a bit larger than standard 6.5's,some careful dremelling might be required.but still a solid investment indeed.if i could change anything about this product,it would made in the USA!!!! [example.JL audio subs] as far as sonic electronix goes, it's a no brainer. there shipping times,and price point is spot on. thank you sonic.

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Scott

Oklahoma

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Value
Features
Design
Usability
Awesome Speakers!

January 11, 2012

I ordered these to install on the swim deck of my AR230 Yamaha boat. They sound amazing! Water rushes over them and drowns them every single time the boat stops and they have never skipped a beat. No disappointments.

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Boat Boy

Canada

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Value
Features
Design
Usability
Great quality!

January 3, 2012

These look good, and sound amazing. Add an amp to them and you'll be even more impressed.

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Rudy

bakersfield ,ca

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Durability
Value
Features
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Usability
Motorcycle

November 28, 2011

I installed these on my dead center motorcycle fairing wit the bikertronics amp. The speakers blew out within 3wks. Do not recommended for motorcycle fairings.

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Skydog

Byron,IL

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Durability
Value
Features
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Usability
Boat speakers

September 28, 2011

Great great speaker very happy!!!! And it is hard to please me!!!

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MastercraftX2

Great Britain

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Value
Features
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Usability
Excellent Speakers - amazing sound from such a small speaker

August 8, 2011

I bought these speakers after searching through many manufacturers products. I was comparing impedance, output, noise levels, size, etc and for their money there was nothing close to these. I have since installed them on my boat powered by a 2 channel 400W Amp (100W RMS / channel @ 4 ohm) and the sound completely blows me away. Wakeboarders at the end of an 80 foot line can hear the speakers loud and clear yet due to their position on the boat tower the people in the boat can still hold a conversation. I've seen speakers twice this size unable to match the performance of these units. If you want a loud and clear speaker look no further - they are truely amazing.

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Jim Lee

Anacortes WA

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Value
Features
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Usability
They're great!

April 22, 2011

We build LED lights, iPod stereos and sailboats. We needed a speaker, to install in our sailboats, to work with our stereos that was lightweight, water proof, and 100 watts or less. On top of this, it had to sound good. These Polk Audio MM651UM speakers fit the ticket perfectly. They work great, sound great and we've never had a problem with any of them that we've installed. And they live in boats sitting in sea water all year. My biggest fear is that they might be discontinued and we'll have to go through all the searching yet again!

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Beanno

LaMarque,TX.

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Durability
Value
Features
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Usability
GREAT SOUND

April 6, 2011

The speakers have a unique look and the have a great sound. Have not owned them long enough to know about the durability of the speaker being in a boat, but so far so good.

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Bob

East Greenwich, RI

Overall
Durability
Value
Features
Design
Usability
Excellent Marine Speakers

January 19, 2011

I replaced the four outside original Clarion speakers in my Sea Ray 33 foot 330 Sundancer with the Polk Audio MM651UM speakers. They fit in the existing openings and only required re-drilling for the mounting screws. The sound is excellent. I am not an audio snob but I do appreciate good quality sound and I am extremely happy with these speakers. I investigated the DXi650 model speakers and was very disappointed with the sound quality from them. I highly recommend spending the extra money on the MM series as they sound much, much better and they are completely water proof. The only negative I can find is that the speaker grill leaves much of the cone exposed. If you have young children that might poke their finger into the speaker or if the speakers will be mounted in an active area where something might puncture the speaker then that might be an issue. Otherwise, they are great. You will not be disappointed with the sound and you cannot beat Sonic Electronix price either. They are a great deal through this vendor.

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gds

Dallas, Texas

Overall
Durability
Value
Features
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Usability
Satisfied

December 9, 2010

I upgraded the stock radio and speakers in my boat with a pair of Polk MM651UM speakers. I chose this pair based on size, power rating to match the new stereo unit, and assumed quality. I am sure they could provide extra kick if I installed an amp but they do just fine without and I dont want to add anymore load to the electrical system. I am satisfied with the look, power, and sound that I get from these speakers, they sound great.

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Crabman

Maryland

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Value
Features
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Usability
Great sound. Good value

December 2, 2010

I replaced two old speakers on my center console Carolina Skiff. They are exposed to slot of weather and hold up very well. The sound is excellent. Very deep base and no distortion. I would highly recommend them.

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skyskier

Md

Overall
Durability
Value
Features
Design
Usability
Great speakers

September 12, 2010

These are true marine speakers. The silk dome tweeter keeps the treble very smooth yet detailed. The bass is better than the WetSounds speakers I compared them to. Feed them with plenty of the highest quality watts you can afford and you will be richly rewarded. At the price Sonic sells them for, this purchase is a no brainer.

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Mike

Kingsville, MO

Overall
Durability
Value
Features
Design
Usability
Be Aware

August 12, 2010

I installed these and used them 3 times before one speaker started acting up. It quit working so I called to have it replaced and they said it would take 3-5 weeks to fix. The person talked me out of buying JL Audio and said these are just as good, my mistake!!! I am now buying from a local company because I can't go without music for 3-5 weeks.

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TheMofo

Oxnard, CA

Overall
Durability
Value
Features
Design
Usability
Great Sound, Smooth and Balance, Durable, Candy for the Ears!

March 8, 2010

These are great sounding speakers! I am very picky on audio and visual. I used these speakers on the outside of my toyhauler. The sound is superb with great bass and clear highs. Overall tonal balance is natural and smooth. People and friends tell me how nice the music sounds and I have to agree! I really enjoy listening to music in camp as long as the surrounding area is quiet. These speakers would also fit a boat nicely as well. I would even put them in a car but you are overpaying for the Ultra Marine qualities. I wash my RV after every trip and the speakers hold up well to water spray(I try and avoid direct hose streams). They also hold up well to wind as the speakers see freeway speeds while towing. If you need a durable speaker with awesome sound quality then look no further! If you are strictly into sound quality competition then you probably need separates which would provide minimal gains in SQ. I have them hooked up to a Soundstream Rubicon amp but they sounded impressive playing off the Pioneer Premier head unit as well! I highly recommend them for a marine environment or exposure to outdoors.

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Thurston, III

Houston TX

Overall
Durability
Value
Features
Design
Usability
Excellent sound and low end range

October 18, 2009

I highly recommend these speakers as they sound wonderful with a great low end punch. I bought these for my boat and will be buying 2 more pair to put in my car. Great value and incredible sound.

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Accessory Tools and Products

Accessories added

NVX 25 ft. of True Spec 12 Gauge Speaker Wire

100% OFC wire with EnvyFlex metallic jacket insulates and protects against damage from extreme conditions.

Your Price $39.99

Streetwires 25 ft. of True Spec 12 Gauge Speaker Wire

You need speaker wire to connect your speakers!

Your Price $44.95

Belva 23 ft. of True Spec 12 Gauge Speaker Wire

100% Copper Clad Aluminum, high strand count with ultra-flexible PVC blended jacket for easy installation

Your Price $14.99

12-10 AWG Yellow T-Tap Adapters

Allows for fast and easy splicing of wires by easily tapping into the cable.

Your Price $4.49

12-10 AWG Quick Disconnect Connectors

These yellow quick disconnect connectors make it easy to connect and disconnect speaker wire your to your new aftermarket speakers!

Your Price $6.99

NVX SDDK12 Door Kit

Eliminates speaker panel distortion and reduces door vibration, rattles and squeaks!

Your Price $49.99

Dynamat Xtreme Door Kit 10435

Enough sound dampening to cover most doors!

Your Price $69.95

Stinger Roadkill Door Kit

Use this to eliminate rattle from your doors!

Your Price $46.99

Car Stereo and Speaker Installation Tool Kit

Includes Test Light, Crimp/Splice Tool, Multi-bit Screwdriver and more.

Your Price $12.99

Universal Wire Puller & Grabber

Running wires has never been easier! This wire puller allows you to run wires through those hard to reach places!

Your Price $6.99

Xscorpion 9-Piece Nylon Plastic Pry and Chisel Tool Set

Easily removes dash/trims, door clips, panels and pins, rubber grommets and vehicle emblems.

Your Price $14.99

3 in 1 Wire Quick Splice T-Tap and Butt Connector Crimper + Wire Cutter

Used for cutting copper and aluminum wires up to 8 gauge.

Your Price $21.99

NVX SDRLR1 Sound Dampening Rubber Roller

Install your Sound Dampening with ease! This heavy duty rubber roller is designed specifically to install your NVX products!

Your Price $7.99

Speaker Baffles for your Speakers

Enhance the sound of your speakers with these easy to install speaker baffles.

Your Price $9.99

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Product Summary

Manufacturer

Model Number

MM651UM

UPC

747192114671

Weight

6.00lbs

Internal SKU

mm651um

Internal Product ID

14717

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