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The Polk Audio MM691 is a high performance 3-way 6" x 9" speaker that is designed for sport vehicles such as Jeeps and boats.

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Pros

installation is quick and straight forward, no special considerations

1 agrees

lows are detailed and clear, no boom or distortion

1 agrees

sound is full and resonant

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Cons

speaker wire on the cross over is short, makes tucking everything away difficult

1 agrees

need to mount the crossover for the tweeter and woofer separately

1 agrees

bass range lacks power, need a separate subwoofer for proper representation

1 agrees

some harshness in the highs

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Edit

 

The Polk Audio MM691 is a high performance 3-way 6" x 9" speaker that is designed for sport vehicles such as Jeeps and boats. These speakers are based on the flagship SR Series but maintain a competitive price. Key features include Neodymium Magnets(light weight rare earth metal), Carbon Composite Baskets, Woven Glass Composite Cones which offer a high stiffness-to-mass ratio for more precision, Large(30mm)-Diameter Voice Coils for increased power handling, and a power handling capacity of 125w(rms). Stylish grilles are also included.

Features
  • Frequency response: 30-25kHz
  • Nominal Impedance: 2.7 ohms
  • Power Handling(continuous): 125w
  • Power Handling(peak): 300w
  • Efficiency: 94db
  • Mid/Woofer:  6" x 9"
  • Midrange:  1" Diameter Tweeter
  • Tweeter:  3/4" Diameter Super Tweeter
  • Full-range Mounting Depth(top mount): 3 3/16", bottom mount: 3 1/2"
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