Polk Audio DB651 6.5 Coaxial Speaker Review

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Polk Audio has created one of the best quality speakers for your travel adventures with their Polk Audio DB651 6.5 Coaxial Speaker. Since 1972, it has been their sole focus to provide the ultimate listening experience with high-quality speakers in design, engineering, and audio innovation for movie and music geeks at home or drivers, boaters, off-road lovers, and motorcyclists out there.

Here are some of the top reasons why you’d love the Polk Audio DB651 6.5 Coaxial Speakers.

Polk Audio DB651 6.5 Coaxial Speaker Review

Summary of Features

  • Includes mounting hardware in stainless-steel for stylish look and durability
  • Includes a user manual on how to install the speakers or adjust the tweeters
  • Has swivel-mount tweeter which allows the speakers to be customizable
  • 120 watts of RMS on each pair and 60 watts on each individual speaker
  • Speakers covered with rubber for better sound and protection
  • Marine-certified – great for Powersports and freshwater applications
  • Built-in crossover with separated high and low frequencies

Easy Installation

It’s a 2-way speaker, and they are great for DIY installation whether one has experience in replacing speakers or not. Most measurements of OEM speakers are 6-1/2”, and the Polk Audio DB651 6.5 measures 6-1/2” or 6-3/4”, which will fit perfectly with zero problems.

Great Sound Experience

It is a 2-way speaker with a rubber surround, which is best in giving quality bass. The tweeter is a silk polymer composite that gives off a nice smooth, detailed sound. This speaker also has a magnetic fluid around it which dissipates heat which keeps the sound clear and detailed even when the volume is cranked. It is also surrounded by rubber that is flexible and allows optimal cone movement, delivering the bass with the utmost quality and clarity from the woofer.

Marine Certified

The Polk Audio DB651 6.5 Coaxial Speaker is perfect for use in marine vessels. It can be installed in boats or motorcycles where the speakers will be exposed to the elements, and it will be just fine.

Highly Durable

The speakers are surrounded by rubber which protects them from exposure to extreme temperatures. In addition, the rubber holds up well and is not be affected by moisture at all.

Great Crossover Filter Feature

Most people would not go for coaxial speakers due to having a jumbled up lows and highs. However, Polk audio included a built-in crossover that separates the high frequencies from the lows. So the low frequencies will be going to the woofer, and the high frequencies will be going to the tweeters. This way, the soundstage will be better, giving you quality sounds all day.

Amazing Swivel Mount Tweeters

Besides having a high pass and low pass crossover for this speaker, the Polk Audio DB651 also has a flush and swivel-mount tweeter. This allows the speaker to be more customizable. It can be pointed to one’s desired direction to achieve the best soundstage.

Eye Appealing Apperance

Other than the rubber surrounding and durable tweeter cones and woofer, the entire mounting hardware is made from stainless steel, thus maintaining that shiny appearance and strength. This makes the speakers stylish and highly durable for greater protection from any physical damage.

Affordable – Bang for Your Buck!

With its price and the multiple features this speaker offers, one would understand why it has lasted so long in the industry. Though it’s not the cheapest in the market, these speakers are worth every penny with the quality performance it gives. In addition, it’s easy to install, which means no more additional charges for installation. Plus, it’s long-lasting and highly durable, which means it will serve for a very long time.

Design Specifications

  • Speaker Size: 6-1/2”
  • Peak Power Handling: 200 watts
  • RMS Power Handling: 100 watts
  • Frequency Response: 35-22,000 Hz
  • Sensitivity: 92 dB
  • Impedance (Per Voice Coil): 4 ohms
  • Speaker Design: 2-way
  • Tweeter Composition: Silk-Polymer Composite
  • Woofer Composition: Mica Injected Polypropylene (MIPP)
  • Woofer Surround: Butyl Rubber
  • Top-mount depth: 1-5/8”
  • Bottom-Mount Depth: 2-5/16”
  • Cutout Dimensions: 5”
  • Speaker Grilles: Yes
  • Shallow Mount: Yes

What We Liked:

  • Durable design
  • Fits most cars
  • Great customer support
  • Budget-friendly pricing
  • Easy to install in any locations inside the car

What We Didn’t Quite Like

  • Not the right size for some vehicles
  • Bass doesn’t have a very deep sound


Suppose you want to replace your old car speakers or want to upgrade your sound experience while on the road or the sea, Polk Audio DB651 6.5 Coaxial Speaker is truly a great choice. The best part about these speakers is that you don’t have to go broke to enjoy better music. It offers all the great features a car speaker system would need and more. In addition, it’s affordable with a high-quality performance which offers great value for your money, making it a totally great investment.


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