What is the cut out diameter on these? Will they fit into my 4.75 openings in my boat?

No, you would need to make the cutout diameter 5.51 inches.

Is this a pair or just one speaker?

It was a pair. I think they sound great as well.

blue tooth capabilities? i need for a jet ski?

I use blue tooth for these speakers but it requires a driver/amp. These speakers can handle some power. These also have pretty good bass. There are some compact blue tooth amps that would fit in your jet ski

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BBMS8B 8” 2-Way 500W Peak (250W RMS) Black Marine Coaxial Speakers for Marine/ATV/Motorcycle/Powersports

Product ID: 128332397

Details

Audio Output Mode
Stereo
Brand
BELVA
Connectivity Technology
Auxiliary RCA
Frequency Response
20000 hertz
Speaker Maximum Output Power
500 watts

💧IP66 Waterproof Rating

🔊500W Peak Power

⚙️Rust-Resistant Polymer Build

$248.52

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Description

🌊 Turn Up the Tide with Sound That Stands Strong!

SEAMLESS CONNECTIVITY - Compatible with Bluetooth, auxiliary, and RCA inputs to keep your playlist flowing wherever you go.
EFFORTLESS INSTALLATION - Includes stainless steel mounting hardware and speaker grilles for a sleek, secure fit on boats, ATVs, and powersports vehicles.
BUILT TO BRAVE THE ELEMENTS - IP66 waterproof rating and rust-resistant polymer construction ensure durability in the harshest marine environments.
PRECISION AUDIO ENGINEERING - 1" PEI balanced dome tweeters and 1.2" aluminum voice coil provide crisp highs and rich, immersive sound.
POWER THAT COMMANDS THE WAVES - Feel every beat with 500W peak and 250W RMS power delivering crystal-clear sound on your marine adventures.

The BELVA BBMS8B 8” 2-Way Marine Coaxial Speakers deliver powerful 500W peak audio with a rugged IP66 waterproof design, perfect for boats, ATVs, and powersports. Featuring a polypropylene cone, rust-resistant polymer basket, and precision tweeters, these speakers ensure crystal-clear sound and durability in any marine environment. Easy to install with included stainless steel hardware and versatile connectivity options, they’re engineered to elevate your outdoor audio experience.

Specifications

ASIN	B07NLJRK4G
Antenna Location	For Marine Vehicles, For ATVs
Audio Driver Size	8 inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Stereo
Best Sellers Rank	#8,674 in Electronics ( See Top 100 in Electronics ) #11 in Marine Speakers
Brand	BELVA
Built-In Media	Stainless steel mounting hardware, speaker grilles, 1 x 8" marine speaker
Color	Black
Compatible Devices	Smartphone
Compatible with Vehicle Type	Boat
Connectivity Protocol	Coaxial
Connectivity Technology	Auxiliary, Bluetooth, RCA
Control Method	Touch
Controller Type	Button
Customer Package Type	FFP
Customer Reviews	4.5 4.5 out of 5 stars (372)
Enclosure Material	Injection Molded, Rust Resistant Polymer, Polypropylene, Rubber
Frequency Response	20000 hertz
Global Trade Identification Number	00818060019517
Impedance	4 ohm
Is Waterproof	Yes
Item Dimensions D x W x H	3.54"D x 8.07"W x 8.07"H
Item Weight	6 pounds
Manufacturer	Belva
Model Name	BBMS8B
Model Number	BBMS8B
Mounting Type	Stainless Steel Mounting Hardware
Number of Audio Channels	2
Number of Items	1
Power Source	Battery Powered
Speaker Maximum Output Power	500 watts
Speaker Size	8 inches
Speaker Type	Coaxial
Subwoofer Connectivity Technology	Wired
Subwoofer Diameter	8 inches
Tweeter Diameter	1 inches
UPC	818060019517
Unit Count	1 Count
Warranty Type	Limited
Water Resistance Level	Waterproof
Wireless Technology	Bluetooth
Woofer Diameter	8 inches

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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