Polk Audio db651s 6.5" db Series Shallow Mount Car Speakers

Polk Audio db651s

6.5" 2-Way Marine Grade db Series Shallow-Mount Coaxial Car Speakers w/ Liquid Cooled Silk Tweeters

• Peak Power: 330W
• RMS Power: 110W
• 3/4" Liquid-Cooled Silk / Polymer Composite Dome Tweeter
• Mounting Depth: 2"
• Lightweight Dynamic Balance Polymer/Mica Composite Mineral Filled Woofer Cone
• 4 Ohms Impedance
• Sensitivity: 92dB

We apologize

This item has been discontinued

Polk Audio

Authorized dealer

Will fit most 6x9" and 5x7"/6x8" locations,
with appropriate speaker adapter. Click "Related Items" Tab.

Polk Audio db651s - Exceptional Quality and Versatility

Step up your vehicles audio performance with Polk Audio's revolutionary db651s'. Cutting edge technology has allowed for an efficient speaker that has ability to accurately reproduce music like you have never heard before. A precise balance of materials including the Silk/Polymer Dome tweeter and Mica Cone woofer enable smooth roll-off and quick response at any volume. The rubber surround adds to bass response as well as increases the lifetime of the speaker under any conditions. Being marine certified, the Polk db651s' will surprise you with its versatility and ability for use in many applications. The high-efficiency loudspeaker means less power is necessary for the same quality output. The revamped db Series delivers that perfect Polk Audio performance and durability like never before.

Important Note(!): Free upgrade to the Polk Audio DB652 upon purchase. Polk Audio db651s no longer available.

General Features:

  • 6-1/2" 2-way Slim Mount Marine Certified Coaxial Speakers
  • Power Handling:
    • Peak: 330 watts per pair / 165 watts each
    • RMS: 110 watts per pair / 55 watts each
  • Recommended power range: 10 - 55 watts RMS per channel
  • Lightweight dynamic balance polymer/mica composite mineral filled cone woofer
  • Marine certified, perfect for use in marine vessels
  • 3/4" Liquid-cooled silk/polymer composite dome tweeter
  • High pass and low pass crossover filters
  • Low-mass 2-Layer 25mm kapton voice coil former
  • Multi-hole mounting pattern
  • Shallow depth
  • Muscular ABS Grilles (Based on MOMO Designs)
  • Durable butyl rubber surround
  • Pole plate heat sink
  • Flat spider for faster, longer excursion linear motion
  • Flexible woven leads sewn directly into spider for greater reliability
  • polarized nickel plated terminals on PCB terminal board
  • Stamped steel basket finished in rustproof gun metal gray
  • Cut-Out Diameter: 5.00" (12.70cm)
  • Top Mount Depth: 2.00" (5.08cm)
  • Frequency Response: 55 - 22,000 Hz
  • Sensitivity: 92 dB
  • 4 ohm Impedance
  • Authorized Internet Dealer
  • 1-year Sonic Electronix Warranty

Priced Per Pair

Speaker Specifications
db (Polk)
Priced Per
Speaker Size
Tweeter Design
Tweeter Size
Tweeter Composition
Silk-Polymer Composite
Woofer Composition
Mica Injected Polypropylene - MIPP
Woofer Surround
Butyl Rubber
Peak Power Handling
165 watts
RMS Power Handling
55 watts
92 dB
Frequency Response
50 - 22000 Hz
Impedance (Per Voice Coil)
4 ohms
Shallow Mount Installation
Top-Mount Depth
Bottom-Mount Depth
Cutout Dimensions
Number of Speakers
General specifications
Marine Certified
Hi-Res Certified
Speaker Grilles
What is in the box?
WITB: Speakers
Other Accessory #1
Other Accessory #2
Other Accessory #3
Other Accessory #4
Other Accessory #5
Authorized Dealer
Authorized Dealer
Warranty and Return Policy
Parts Warranty Duration
1 year
Labor Warranty Duration
1 year
Warranty Provider
Sonic Electronix
  • How To Test Speaker Polarity | Tips & Demo | Car Audio 101
  • Replace your Car Speakers and Upgrade to Better Sound | Sonic Electronix
  • Polk Audio db Series Coaxial and Component Car Speakers
Polk Audio db651s

Polk Audio db651s



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By feature average rating



August 8, 2013

Superb price/quality & value

The Polk db651s are perfect for getting articulate mids and highs in either a car of boat application.

They are equipped with a basic crossovers mounted on the speaker terminals (6db slope) however to sound clean they will need a high pass filter at about 60-80Hz for eliminate the lowest frequencies which will otherwise distort the sound.

Time will tell how long they will last in harsh environments like marine use but thus far (6 months) they seem to be holding up.

For automobiles the 6.5" coaxials will produce more low end such as midbass because of cabin gain however on a boat or any other open air vehicle (golfcart, jeep, ATV...) they will require a subwoofer to augment the missing low frequencies.

Once set up correctly they will sound surprisingly good with very detailed and smooth output.

For the price the value is highly recommended!


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September 17, 2013

Very good sounding speakers

I purchased these speakers to replace the old completely worn out speakers in my Chevy truck. I had to modify the stock speaker mounts to fit them but they fit in there nicely now. The sound is really good. Sounds better than it ever did before. They are a good value for the price. I recommend them.


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June 14, 2011

Great Value, Fast Delivery

I ordered these speakers for my 16 year old son's 1995 Chevy S-10 pickup truck for Christmas. Not only were they shipped right away, but the sound is far superior to the factory speakers at a fraction of the price!


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October 1, 2014


I have these in my sound (roll) bar in my 2014 Wrangler. They sound really well with the JVC deck I installed and were even better when pushed with an Alpine amp (KTP-445U). Install was easy and I couldn't have asked for a better speaker. Easy to install.

If you own a wrangler, I would seriously recommend these. Another piece of advice is poly fill the sound bar. It does help out with the overall sound.


found this helpful.


September 15, 2014

Great highs

These are quality speakers that are relatively cheap and they sound good.


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Smart guy

August 26, 2013

Big sound outy of small speakers

When you buy small speakers (because thats is all the room you have to install in) you really don't expect to get much bass sound out of them.
Well, I was very surprised at the great all around sound I got out of these Polk db 651s speakers. I put them in a smart car and they sounded way better then I ever thought they would.
For the price, they can't be beat!!


found this helpful.


May 27, 2013

Very good value

Very good, clear sounding speaker, and this price was excellent. I bought them for an unusual application - replacing the 4" speaker in a Roland MicroCube guitar amplifier. It gave me exactly the improvement I wanted.


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January 24, 2011

great speakers

Good sound good price I am very happy with them.


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December 9, 2011

Polk Audio db651s speakers

I love these speakers. I installed them in my 2000 Toyota Avalon and they sound absolutely great! I already had the JBL system in my car and the speakers were getting old so I upgraded to these and couldn't be happier. Thanks Sonic Electronix for a great price on some great speakers.


found this helpful.


March 30, 2014

Great Speakers

I've tried other brands at similar prices, but for the money nothing beats Polk Audio (especially when paired with a pioneer head unit). This model is the shallow mount as opposed to the regular DB651.

If you can fit the DB651 instead of the DB651s, go with the non-s model. It has a slightly bigger magnet and will give you a better low end response.

All in all, Polk makes some great speakers. When I bought these from Sonic they were priced at about $65 /pair which is a helluva deal for these speakers.


found this helpful.


April 6, 2011

Best bang For the Buck

Best car speakers ever own. And they sound Great at high or low volume.


found this helpful.


March 16, 2009

Great Product!

I purchased Polk Audio from Sonic Electronix because of the wonderful price listed on their site, that was far different in comparison to the retail store price. They were not only reasonable, but arrived in a timely matter. When the speakers were installed the sound quality was absolutely wonderful! I felt as though I had a brand new sound system in the car. When it comes to products that are inexpensive but superb quality, I'd most definitely purchase from Sonic Electronix again.


found this helpful.


November 21, 2014

Polk db651s

I put these in my work van and it souds like I am in a different vehicle.
The sound is much better than stock speakers, and that is running the
Polks with the factory radio. I'm glad I bought the shallow mounts,
because the tweeter on the regular db651 speakers would have not
fit behind the factory door panels. If you are looking for a great factory
replacement I would highly suggest getting a pair.


found this helpful.


January 19, 2009

Powerful Highs

Hooked this up to a 80 rms, doing just fine. They drowned out my back speakers now. And I am very happy with the highs these guys produce. Very good buy if you need highs.


found this helpful.


August 29, 2013

Great Speakers.

Got those along side my Alpines SPR-50, they make up for the lack of midbass from the Alpines. Great value for the money but again with Polk Speakers Sensitivity ratings are open to interpretation.


found this helpful.

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