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Polk Audio MM691

6"x9" 3-way car speakers

24 Reviews | 2 questions - 8 answers

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Overview

Our take on the Polk Audio MM691

Polk Audio continues its tradition of making brilliant-sounding speakers in stylishly designed packages — their Mobile Monitor (MM) Series speakers look great and sound even better. Each speaker utilizes an extra-strong, extra-small neodymium magnet that saves space and weight, allowing these speakers to fit into more places in more vehicles while still delivering a full sound with lots of kick. Their lightweight carbon composite frames provide strong, flex-free support for the speakers' motor assemblies.

Polk Audio continues its tradition of making brilliant-sounding speakers in stylishly designed packages — their Mobile Monitor (MM) Series speakers look great and sound even better. Each speaker utilizes an extra-strong, extra-small neodymium magnet that saves space and weight, allowing these speakers to fit into more places in more vehicles while still delivering a full sound with lots of kick. Their lightweight carbon composite frames provide strong, flex-free support for the speakers' motor assemblies.

The Polk MM691 6"x9" speakers feature honeycomb-textured woven glass fiber composite woofer cones that respond very quickly for a clean, crisp, and powerful sound. Large voice coils — over an inch in diameter — give the speaker high power handling capability and extended reliability.

3/4" and 1" silk dome tweeters add a sweet high end that blends perfectly with the low notes so your music stays in harmonic balance, from the electric bass all the way on up to the cymbals.

Important Note: These Polk speakers use a low-impedance design to pull more power safely from your car stereo or amplifier. This design is compatible with virtually all factory and aftermarket stereos.

Priced per pair

These were my 5th pair of 6x9s I have tried. These are by far my favorite. The mids are great, the highs are not harsh, and clear, bass response is great too. Mounted from the bottom on my 06 accord.

Anonymous, Sunnyvale, CA

What's in the Box:

  • Two 3-way speakers
  • 2 Grilles
  • 2 Passive crossovers
  • 8 Mounting screws
  • 8 Speed clips
  • Owner's Manual
  • Product Registration information sheet

Product Highlights:

  • 6"x9" 3-way speakers (pair)
  • woven honeycomb glass fiber composite woofer cone with butyl rubber surround
  • 1" and 3/4" silk composite dome tweeters
  • certified for marine use
  • 2.7-ohm impedance for extra power (compatible with virtually all factory or aftermarket car stereos)
  • power range: 15-125 watts RMS (300 watts peak power)
  • frequency response: 30-25,000 Hz
  • sensitivity: 94 dB @ 1 V
  • top-mount depth: 3-3/16"
  • warranty: 1 year
  • Our 60-day money-back guarantee
Reviews

Polk Audio MM691 Reviews

Average Customer Review(s):

(24 Reviews)
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Details

Hands-on research

Features and Specs

General
Speaker Size 6X9
Design 3-way
Tweeter Design 3/4" Soft dome
Tweeter Composition Silk/Polymer composite
Woofer Composition Glass Fiber Composite
Woofer Surround Butyl Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Specifications
Sensitivity (1W at 1 meter) 94
Sensitivity at 2.83 volts N/A
Frequency Response 30 - 25k Hz
Minimum RMS Wattage 15
Maximum RMS Wattage 125
Peak Power Handling (Watts) 300
Impedance (Ohms) 3
Top-mount Depth (Inches) 3 3/16
Bottom-mount Depth (Inches) 3 1/2
Cutout Diameter or Length (inches) 0

Product Research

Features

Dynamic Balance: Dynamic Balance is a proprietary Polk Audio technology using laser imaging to determine what combination of speaker materials create the least amount of resonance. Eliminating resonance in speakers results in a wide, smooth response and low distortion.

Woofer Cones: Woven glass composite cones feature tremendous stiffness-to-mass ratio. Lower mass means faster transients and finer detail.

Butyl Rubber Surrounds: For a smoother response and improved durability, the woofers use butyl rubber surrounds. The airtight rubber surrounds stand up to moisture, sunlight and extreme temperatures while allowing long excursion linear motion and years of reliable use.

Silk/Polymer Composite Tweeter and Super Tweeter: The speakers feature 1" liquid-cooled, silk/polymer composite tweeters and 3/4" liquid-cooled, silk/polymer composite super-tweeters for clearer, more accurate mids and highs.

Neodymium Magnets: The speaker's neodymium magnets offer exceptional strength to performance ratio and are extremely lightweight.

Large Diameter Voice Coils: Large diameter, 30mm voice coils increase the speaker's reliability and power handling capacity.

Carbon Composite Basket: The speaker's carbon composite basket is lightweight and will not flex during music audio peaks.

Crossover: The speaker comes supplied with two separate 2-way crossovers; one for each speaker. Each crossover input 36" lead is terminated with tinned wire, and the two 20" output leads (one for the woofer and one for the tweeter) are terminated with female quick-slides. The positive woofer lead has a 0.250" female quick-slide and the negative woofer lead has a 0.187" female quick-slide. The positive tweeter lead has a 0.187" female quick-slide and the negative tweeter lead has a 0.110" female quick-slide. These quick-slides connect directly to the woofer and tweeter terminals on each speaker. The separate 2-way crossover network sends the appropriate frequencies to each driver for cleaner sound and better imaging. Dimensions: width = 3.515", height = 1.015", depth = 2.555"

Grilles: Strong ABS plastic grilles are included. These computer optimized grilles feature a spoke-wheel design.

Marine Certified Woofer: Polk MM Series speakers are built to withstand exposure to moisture and UV rays, so they work well in boats and cars. They also include stainless mounting hardware for corrosion and rust resistance.

Our Product Research Team

At Crutchfield, you'll get detailed, accurate information that's hard to find elsewhere. That's because we have our own in-house Product Research team. They verify what’s in the box, check the owner's manual, and record dimensions, features and specs. We stay on top of new products and technologies to help people make informed choices.

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Q & A

Customer Q&A

2 questions already asked

I would not recommend this application. [ Mark  May 20, 2016 ]
The Polk mm691 speakers are marine certified and sound great. They do require a lot of power. I have these paired with mm651 and a ppi 900.4 amp they sound great and get really loud. The Polk mm651 um are one of the highest rated marine speakers on the market. [ William  May 20, 2016 ]
Not sure how they hold up to salt water and the weather conditions but I put them on the motorcycle and they held up in the rain and they sound awesome [ robert  May 20, 2016 ]
I'm not sure about boats but bought them for my car they are ok Sound is satisfactory [ RICHARD A  May 19, 2016 ]
I'd probably go with polyplaners. The Polks are great but I don't think they would stand up to long with a constant barrage ow water. [ David john  May 19, 2016 ]
I just bought them for mine.. I've head nothing but good things about them [ Michael  May 19, 2016 ]
I put them on my motorcycle and they are OK... I probably would not purchase them again because they clip fairly easily. [ Jesse Felix  May 18, 2016 ]
The included crossovers are passive (meaning they filter the frequencies post-amplification) so in most cases you'd want to leave your amp set for full-range output and allow the Polk crossovers to filter the highs to the tweeter and lows to the woofers. I hope that helps. My Bio: http://www.crutchfield.com/Support/Bio.aspx?bio=159 [ Larry  Apr 22, 2016 ]  Staff
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