MS 6520
1.7 (19)
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Plus One™ Woofer Cones

Harman’s patented (US patent #7,548,631) Plus One™ polypropylene cones provide more overall speaker-cone area than other cones in its class — the result is higher sensitivity, increased low-frequency output and greater musical character.


Balanced Dome Tweeters

Weather resistant tweeters deliver a smooth high-frequency response and increased power handling for highs and mids, which equates to more lifelike sound from vocals, cymbals, brass instruments and pianos.


Designed for the Elements

Their one-piece polymer basket is designed to stand the test of time, even after long exposure to the sun and salt. Rubber surrounds offer superior edge protection and are much more reliable than foam. And a grille-mounted tweeter allows the front of the woofer cone to be sealed, protecting the motor structure from sea spray.


Individually Voiced

For most brands, off-the-shelf speakers and a cursory approval of frequency response curves are good enough. That’s not the case with JBL. We don’t only listen to our speakers against the competition — we voice them against each other to ensure each line has the consistent JBL sound signature that’s known and sought out by those who care about their audio. This is just part of an extensive development process undertaken by some of the best transducer engineers in the world to provide the finest listening experience at any price point.


OEM-Level Reliability Testing

JBL tests every speaker design to rigid specifications, subjecting them to extreme conditions that would break lesser speakers — this ideal for equipment that will be heavily driven in the elements. We freeze them, bake them, shake them, blast them with ultraviolet light and drive them at full power for days to make sure your audio investment lasts for years.

Specs & Downloads

Item# MS6520


The sound of the sea could use an upgrade

The new JBL Marine Series Speakers are ready to take on anything Mother Nature throws your way. With Plus OneTM woofers and balanced dome tweeters, you’ll hear the clarity of your audio above the raucous sounds of the sea. Designed to take on the sun, sea spray and scrub downs, these powerful speakers feature waterproof motor structures, a one-piece cast-polymer basket, a sealed magnet, and rubber surrounds.

General Specifications

6” Coaxial

Audio Specifications

Power Handling (Peak)
Frequency Response
50 Hz – 20 kHz
90 db
Nominal Impedance
4 ohms

Documents & Downloads

Reviews and Q&A

Customer Reviews

Rated 2 out of 5 by from fragile bought boat in 2016, so far three of speaker grills broke, since then all six have been replaced, but two of them do not work, trying to get those replaced. i was told by shop that it is a flaw. newer ones seem to have a better grill, time will tell, hopefully they willl replace the two new ones that are not producing any sound. its been frustrating, and not a cheap boat.
Date published: 2017-06-19
Rated 5 out of 5 by from Definitely a big step up Excellent sound quality. Significantly better than the Sony speakers that the MS6520 replaced.
Date published: 2017-08-02
Rated 1 out of 5 by from Break easily! I bought a boat with 6 of these less than a year ago. The boat is stored in enclosed storage when not in use, probably have 40 hours on the boat. That little amount of sun has caused these speaker grills to become brittle and 3 of them broke today. It looks as if the center tweeter or whatever is not supported well enough by the plastic grille/cover.
Date published: 2017-06-12
Rated 1 out of 5 by from Junk They cracked after 2 months on the boat. 4 of 6 had to be replaced. Limited sun and moisture exposure on all of the ones that needed to be replaced too. The grill materials are not marine sufficient, like other reviews here the grills crack and become useless.
Date published: 2017-06-14
Rated 2 out of 5 by from Frustrated with grill replacements I was on here looking for speaker grill replacements and noticed a lot of similar reviews. I have a 2 year old Sea Hunt, and need grill replacements for all 6 of my speakers. There are 4 that are broken/cracked, and the other 2 are brittle and about to break. Is there a recommended replacement that won't do the same thing?
Date published: 2017-11-27
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Product Q&A

Have the MS 6520 speaker grills been improved. I have heard poor reviews of the grills cracking from the sun.

Asked by: Squash2626
We have not been given any information if this has been a known issue with the MS 6520 or if the speaker grilles have been given a different material for possibly better durability. If you are the owner of an MS 6520 that is having a similar issue, we would like to work with you directly to help you with your issue. Please submit a case request at and the Customer Service Team will be more than happy to assist you.
Answered by: Steven M
Date published: 2021-06-06

Hello, I was installing these in my boat and seem to be missing a few of the screws that came with the speakers.  Is there somewhere on your site I can find these? or what hardware supplier do I need to look at to secure some? Thanks!

Asked by: Boating217
Thank you for bringing this to our attention. We wish to work with you directly for us to be able to determine the correct parts your speakers needed to be install in your boat successfully. Please contact customer service at.
Answered by: Ray at Customer Support
Date published: 2021-06-06

Which current marine speaker replaces the MS6200? I am hoping to use the same screw location pattern as my current MS6200's?

Asked by: KGoib
We'd like to work with you directly so we recommend the proper replacement for your MS6200. Please reach out to our Customer Support through our Harman Audio Support page here:
Answered by: Mario at Customer service
Date published: 2021-07-18

Can you please tell me which speakers will replace the MS6200 marine speakers using the same cutout dimensions and screw pattern. 

Asked by: KGoib
Thank you for your interest in our products. Please contact customer service for further assistance regarding our marine speakers.
Answered by: Mario at Customer service
Date published: 2021-07-19

What is the bolt pattern on the MS6520?

Asked by: RM6361
We would like to work with you directly to help you with your issue. Please submit a case request at and the Customer Service Team will be more than happy to assist you.
Answered by: Mario at Customer service
Date published: 2021-06-06

Are any of your JBL marine speakers magnetically shielded from interfering with a nearby boat compass?

Asked by: Boatperson
Unfortunately, our marine speakers are not shielded. Mounting distance of the speaker would really depend on how the compass would react to the speaker. Try holding the speaker near the compass and walk away from the compass until it stops reacting to the speaker. The distance from where you stopped would be a good location to mount the speaker.
Answered by: Ren at Customer Service
Date published: 2021-06-06

Can these be installed without the grills?

Asked by: hdrider
Hi! Apparently not, as the grilles on these speakers are integrated in to the speaker frame.
Answered by: Nick F
Date published: 2021-06-06

Will these fit on Harley Davidsons?

Asked by: Harleydude
This JBL MS6520 is designed to take on the sun, sea spray and scrub downs, it will suit outdoor climate changes just fine. Whether or not the speaker will adequately fit your Harley-Davidson we are unsure.
Answered by: Joe G at Customer Service
Date published: 2021-06-06
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