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Kicker KM604W

6-1/2" 2-way marine speakers

Item #: 20641M604W

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14 Reviews | 1 question - 3 answers

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Great sound, subtle design

These powerful Kicker 6-1/2" speakers are tough enough for marine duty, but easy on your ears. The durable poly woofers and 1/2" balanced dome tweeters cut through wind, waves, and engine roar to deliver great sound without annoying harshness. The classic white grilles will look great in your boat, too.

Like all KM Series models, Kicker designed these 4-ohm speakers for life on the water, with sealed motors, rubber cone surrounds, and locking terminal covers to keep spray away from the internal componentry. They'll also stand up to harsh sunlight, thanks to special UV treatments on the cones, surrounds, baskets, and grilles. Whether you're on fresh water or salt, these speakers will give you years of outstanding performance.

Product Highlights:

  • 2-way 6-1/2" marine speakers (pair)
  • UV-treated polypropylene woofer with Santoprene rubber surround
  • 1/2" PEI film dome tweeter with neodymium magnet
  • white grilles
  • sealed motor structure and locking terminal covers
  • power range: 2-50 watts RMS (150 watts peak power)
  • frequency response: 35-21,000 Hz
  • sensitivity: 90 dB
  • top-mount depth: 2-1/2"
  • warranty: 1 year
  • Our 60-day money-back guarantee

Kicker KM604W Reviews

Average Customer Review:

14 Reviews

Great Marine Replacement Speakers

Written by: TravisH from Nashville TN on January 19, 2016

Replaced the blown out Jensen speakers that came with my Party Barge with these, radio has 40W RMS output, so I didn't amplify separately, they sound great, nice mid and low range and easy to install with one piece design.

Pros: Sound Ease of Install Delivered quickly Well packed

Cons: None


Written by: Hunter from Tennessee on September 21, 2015

Crutchfield Customer Review (What's this?)

They will take every bit of the rms of 90 and then some. I have them in my jeep and they are so clean.

Pros: everything they are awesome

Cons: nothing

Boom Bang

Written by: notfastnotfurious from Wisco on July 24, 2015

Crutchfield Customer Review (What's this?)

The speakers themselves are awesome. I'm not a big audiophile so i can't tell you how much better the mid's were than the hi's, but they sounds great in the boat, and when paired with the amp i picked up kick out great sounding music all that way up to the head unit's max volume. I would have given a 5 star review, but i'm disappointed that Crutchfield didn't ship plug on leads for the speakers, c'mon Crutchfield?!

Pros: I said above

Cons: no plug on leads for speakers, must make your own or solder some on

Kicker KM604W

Written by: John D from North Carolina on June 16, 2015

Crutchfield Customer Review (What's this?)

Grand Kids Love New Speakers


Cons: Grill is to open in front of speaker

Excellent value!

Written by: DaveL from Minnesota on June 12, 2015

Crutchfield Customer Review (What's this?)

I ordered two pairs to replace the four original marine speakers (2003) that had completely degraded. I am really happy! These Kickers are a terrific value! The bass is solid and the mid and high ranges sound fine. Running off stock JVC deck at 45 watts per channel. There are a lot of options for stock/OEM replacements... Kicker is a very good choice.

Pros: 1.) Ease of installation 2.) No separate grill; cover "grill" integrated into speaker frame. 3.) They sound very good in factory locations.

Cons: No problems that I encountered.

Great spekers

Written by: Dander3 from South Carolina on May 27, 2015

Crutchfield Customer Review (What's this?)

I bought these to replace a pair of Clarion marine speakers that blew after a year. All I can say is WOW, these kickers are great for the price. The bass is impressive and the highs are pretty good. I'm still running them on my old Jensen head unit, but I'm sure they would sound even better with more power. I had several people ask this weekend if I had a sub on the boat the bass was so good. I would absolute recommend these speakers.

Pros: Great bass Very efficient

Cons: the tweeter is a little scratchy, but still good for the price.

Kicker KM604W

Written by: Anonymous from Terry ms on May 16, 2015

Crutchfield Customer Review (What's this?)

Purchased these to go in some tubes for a four wheeler! These speakers are on a clarion amp and they are insane!



Great speakers

Written by: Anonymous from Gainseville, Fl on May 15, 2015

Crutchfield Customer Review (What's this?)

Used them to make a waterproof speaker work great. Sound is clear and have good bass.



Much better than factory

Written by: DM from Ohio on April 20, 2015

Crutchfield Customer Review (What's this?)

I replaced my factory 6.5" speakers in my Yamaha 242 Limited. I kept the factory head unit and the new Kickers sound 100 times better. I know they perform even better with an amp but I chose to keep my factory unit for now. Well worth the investment and the advice I received from Crutchfield was 100% on par with what I needed. Thanks!

Pros: Great value, great sound, superb sensitivity, low power need

Cons: None

km60 speakers

Written by: Ty from oklahoma on April 12, 2015

Crutchfield Customer Review (What's this?)

Put 2 pair of these in our boat. They sound great. I almost went with the more expensive color changing ones, but decided on these. They're ez to install, crisp and clear. Powering them with a Fusion stereo, seems like a perfect match. Thanks Crutchfield.

Pros: Not too expensive, sound great, look great, and efficient.

Cons: None yet

what i expected

Written by: markos from san diego on September 27, 2014

Crutchfield Customer Review (What's this?)

put them in my 32 foot monterey. they sound as expected. my issues stem more from needing more power and a sub than anything. but these speakers fit their need. i'm satisfied with them.



Surprise Performance

Written by: CarlG from Ridgefield, CT on September 5, 2014

Crutchfield Customer Review (What's this?)

I didn't expect the response range and the efficiency from these speakers. Sound quality equal to speakers costing much more. Performed very well at higher volumes while operating the boat.

Pros: Great quality at an affordable price

Cons: Wished they were a little smaller to fit in original cut outs.

What an improvement!

Written by: Sparky from Clintonville, WI on August 21, 2014

Crutchfield Customer Review (What's this?)

Huge improvement over the stock speakers in my boat. Better sound throughout the entire listening range. I'm sure these speakers would really deliver with a marine amplifier!

Pros: Great performance. Excellent price.


Kicker KM604W

Written by: Jeff from Tim's Ford Lake, TN on July 8, 2014

Crutchfield Customer Review (What's this?)

I put 4 of these speakers in my boat and they sound great. They have excellent depth/bass. The 22 watt Kenwood gives them plenty of power for all the volume and quality sound I need. I am very pleasantly suprised with these speakers.

Pros: depth/bass and quality sound at high volume

Cons: Measurement provided but no "cut out" template to trace for marking hole cut. Expected one on the box but not there.

Hands-on research

What's in the box?

Download owner's manual

  • Two 2-way speakers with attached white grilles
  • Eight 1" Self-tapping stainless steel screws
  • 8 Stainless steel speed clips
  • Owner's manual (English/ Spanish/ German/ French)

Features and Specs

Speaker Size 6 1/2
Design 2-way
Tweeter Design 1/2" Balanced Dome
Tweeter Composition PEI
Woofer Composition Polypropylene
Woofer Surround Santoprene Rubber
Parts Warranty 1 Year
Labor Warranty 1 Year
Sensitivity 90 dB at 1 watt
Frequency Response 35 - 21k Hz
RMS Power Range (Watts) 2-50
Peak Power Handling (Watts) 150
Impedance (Ohms) 4
Top-mount Depth (Inches) 2 1/2
Bottom-mount Depth (Inches) N/A
Cutout Diameter or Length (inches) 5 3/16

Product Research


Marine-Ready: The Kicker KM series marine coaxial speakers are engineered to meet or exceed industry standards for environmental humidity and corrosion. The speakers feature sealed motors, cones, and locking wire terminal covers.

Size: The41KM604Ws fit into standard 6-1/2 and 6-3/4 openings (standard car speaker sizes), but the frame is even bigger than a typical 6-3/4 speaker, so they are not likely to fit easily in any car applications.

Grilles: The grilles are not removable.

Stainless Steel Hardware: The provided hardware is forged from corrosion-proof stainless steel.

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.

Customer Q&A

1 question already asked

The cover is 7" in diameter. [ Michael  Oct 26, 2014 ]
i didn't measure. but they fit on my 32' monetery perfecetly. [ mark  Oct 24, 2014 ]
7" [ Jason  Oct 24, 2014 ]