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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Description

🌊 Elevate your marine adventures with sound that conquers waves and weather!

EFFORTLESS INSTALLATION - Includes stainless steel mounting hardware and speaker grilles for a sleek, secure fit on any marine or powersport vehicle.
BUILT TO BRAVE THE ELEMENTS - IP66 waterproof and rust-resistant materials ensure your soundtrack never stops, rain or shine.
PRECISION SOUND ENGINEERING - 1" PEI balanced dome tweeter and 1.2" aluminum voice coil for crisp highs and deep lows.
DESIGNED FOR THE ADVENTUROUS - Durable polypropylene cone and rubber surround built to withstand salt spray, sun, and rough rides.
UNMATCHED MARINE AUDIO POWER - Feel every beat with 500W peak and 250W RMS delivering crystal-clear sound on any waterscape.

The BELVA BBMS8B is an 8" 2-way marine coaxial speaker delivering 500W peak (250W RMS) power, engineered with IP66 waterproof rating and rust-proof polymer baskets. Designed for boats, ATVs, and powersports, it features a polypropylene cone, rubber surround, and a 1" PEI balanced dome tweeter for superior audio clarity. Easy to install with stainless steel hardware and built to endure harsh marine environments, it’s the ultimate sound upgrade for outdoor enthusiasts.

Specifications

Mounting Type	Stainless Steel Mounting Hardware
Material	Injection molded, rust resistant polymer, polypropylene, rubber
Model Name	BBMS8B
Speaker Type	Surround Sound
Special Feature	Dustproof
Recommended Uses For Product	marine
Compatible Devices	Smartphone
Subwoofer Diameter	8 Inches
Surround Sound Channel Configuration	2.0
Color	Black
Included Components	Stainless Steel Mounting Hardware, Speaker Grill, 1 x 8" Marine Speaker
Product Dimensions	9D x 20.5W x 20.5H cm
Item Weight	6 Pounds
Impedance	4 Ohm
Is Waterproof	True
Warranty Type	Limited
Number of Items	1
Control Method	Voice
Wireless Communication Technology	Bluetooth
Speaker Size	8 Inches
Power Source	Battery Powered
Batteries Required	No
Item Shape	Round
Manufacturer	Belva
Item Model Number	BBMS8B
Size	8"
Wattage	500 W

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