6x9-inch coaxial mobile audio 3-way loudspeaker
6" x 9" coaxial
15.24cm x 22.86cm coaxial
Designed to Perform
The MM691 is an ultra-high performance 3-way 6x9-inch suitable for either your vehicle or boat. As a result of 3 years of Polk research and development, the new MM series have been designed to offer unparalleled sound quality with exceptional fit to meet virtually any application. The MM Series offers exceptional value for the price. Through the use of high-tech carbon composite baskets, powerful neodymium motor structures using oversized voice coils, and state-of-the-art woven glass composite cones, we offer high-end audio performance normally found only in the most expensive loudspeaker systems. In addition, these space age materials offer weight savings that can mean higher performance for your car or boat. You won’t be disappointed with the MM691’s performance!
Space age materials reduce weight of components while offering rock solid reliability, advanced looks and ultra high performance.
Neodymium magnets a rare earth metal offering exceptional strength to performance ratio, found only in the most exotic speakers, saves tremendous weight. Don’t let the sound system weigh your vehicle down. Since the magnet is smaller, the speaker can fit into more applications.
Carbon composite basket based on the spokes of a wheel is lightweight, will not flex during peaks and looks great! Don’t be afraid to show off the back of your speaker.
Woven glass composite cones feature tremendous stiffness-to mass ratio. Lower mass means faster transients and finer detail.
Klippel optimized components using a state-of-the-art Klippel distortion analyzer, Polk engineers were able to optimize the woofer’s motor structure, voice coil alignment and suspension for the best possible performance, even at extreme listening levels.
Large-diameter voice coils (30mm) in drivers increase reliability and power handling capacity.
Marine Certified Polk MM Series speakers are built tough to withstand the toughest environments so they are perfect for use in boats of all types. Correct Craft offers Polk speakers in their award-winning Nautiques ski and wakeboarding boats.
All Polk products are made using the best materials and the most advanced manufacturing techniques. They pass the industry’s most exhaustive quality tests, including drop testing, extreme signal response and UV & salt exposure testing. Polk loudspeakers are built to perform for a lifetime.
|Type||Silk composite dome|
|Type||Silk composite done|
|Mid / Woofer|
|Oval Height||6" (15.24cm)|
|Oval Width||9" (22.86cm)|
|Type||Dynamic Balance driver with poly composite cone|
|Total Frequency Response||30-25kHz|
|Nominal Impedance||2.7 ohms|
|Oval Cut-Out Height||8 3/8" (21.27cm)|
|Oval Cut-Out Width||5 1/2" (13.97cm)|
|Height||1 1/8" (2.86cm)|
|Full-Range Mounting Depth|
|Top Mount||3 3/16" (8.10cm)|
|Bottom Mount||3 1/2" (8.89cm)|
|Unit of Measure||pair|
|Speaker Warranty||1 year parts and labor (original purchaser)|
Specifications, dimensions and features subject to change without notice. For more information call us at 1-800-377-7655 (USA and Canada). Outside of North America call +1 (410) 358-3600.
5 reviews with an average of 5Write your own review
by Daniel Slph, July 20, 2008112 out of 195 people found this review helpful.
Very nice and clean look. The cones look like crabon fiber and they run flawless at any level.
Can't really name any. If any I would say that the seperate crossover network boxes were new to me, but I just glued them in my encloser with a big dab of silicone.
Very nice looking speaker for my boats tower encloser. The sound great with no sound quality issues untill I run out of amp. I would highly recommend to anyone wanting to impress.
by Wayne, January 27, 201087 out of 135 people found this review helpful.
Everything about them.
All I can say is WOW!! These speakers are phenomenal. I swapped a pair of Alpine S speakers for these -- and they blow them away. You won't be sorry with these speakers. Excellent Polk quality and sound.
by Jovan, November 6, 201081 out of 110 people found this review helpful.
LOUD...Clean clear sound
rattled my rear deck but I installed dynamat :)
Wow these are monsters, I replaced some Sony xplod 6x9 with these and man I was missing out on my music. The Clarion Eq I used to tweak the Sonys had to be reset to 0. These speakers sound great, good for mid bass and clear highs no distortion at all. These are connected in series to a bridged channel on my Pioneer Amp, Now I have to upgrade the front speakers because I cant hear them at all. I will definitely recommend these speakers to anyone who is looking to improve their sound system. these babys require an amp for full potential though.. Great stuff from Polk
by Michael, July 8, 201073 out of 133 people found this review helpful.
design, power, sound clarity
Attracts too many girls!
The strongest 6x9s I have seen. They make a perfect sound, and they make my car look like a pimp mobile with all the girls it attracts!
by Blake, April 18, 201216 out of 24 people found this review helpful.
colorless, clarity, volume, transparency
I am running these in a 2007 Honda Accord Coupe along with the MM651's, a Dayton Audio Reference HO 15", an Eclipse 5504 headunit, and an Eclipse XA5000 amplifier that is doing 75x4 (thanks to the 2 ohm impedance of these speakers) and 300x1 for the sub. I have had Pioneer REV Series and Focal Polykevlar before, and these are so much clearer and louder it's silly. These sound as good as my 3 way Dayton Reference speakers that I built for my house. They are completely colorless, absolutely detailed, and can get louder than I can stand. The last speakers I will ever buy.
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