Kicker KM604W

6-1/2" 2-way marine speakers

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  • Kicker KM604W

    Kicker KM604W

  • Kicker KM604W


  • Kicker KM604W

  • Kicker KM604W


Our take on the Kicker KM604W

by Jon Paulette

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.

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  • 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

Hands-on research from the Crutchfield Labs (what are the Labs?)

Features and Specs
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
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
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)

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 open the box, verify contents, 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.


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.

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Kicker KM604W Reviews

Average Customer Review:

4 people say:

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3 out of 5

what i expected

Written By markos, san diego on Saturday, 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.
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5 out of 5

Surprise Performance

Written By CarlG, Ridgefield, CT on Friday, September 05, 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.
Great quality at an affordable price
Wished they were a little smaller to fit in original cut outs.
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5 out of 5

What an improvement!

Written By Sparky, Clintonville, WI on Thursday, 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!
Great performance. Excellent price.
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5 out of 5

Kicker KM604W

Written By Jeff, Tim's Ford Lake, TN on Tuesday, July 08, 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.
depth/bass and quality sound at high volume
Measurement provided but no "cut out" template to trace for marking hole cut. Expected one on the box but not there.
2 out of 2 people found this helpful
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1 question already asked

What is the overall diameter of the cover? [ Steve  Oct 23, 2014 ]
3 answers
  • 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 ]

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For a more in-depth review and enhanced detailed information on the Kicker KM604W, please visit the Crutchfield website product page (/ISEO-rccbcspd/p_20641M604W/Kicker-KM604W.html ).