If I'm planning to wire this with a tweeter, do I need to buy a crossover?

The crossover would really be for the tweeter. It protects the tweeter from low frequencies. The woofer doesn't need a crossover.

Are they made with plastic or paper material? And do they distort at high volumes?

They are a silicon type material and they seem to hold up at higher volumes. Keep in mind that these are low cost speakers, they may not hold up in a high performance sound system. They are definitely an improvement over stock speakers in an old Sony cabinet.

What is the mounting bolt circle diameter? Or what is the distance between the mounting holes (either diagonally or on one side)?

These replaced my woofers in my Advent II speakers from the 1990s. They sound great. Diagonally is 7.75". Side to side (and up down) is 5.5". Ned Chatt Jr.

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Description

🎶 Feel the Beat, Own the Sound!

BUILT TO LAST - Butyl rubber surround ensures longevity and high excursion for powerful performance.
PRECISION ENGINEERING - Stamped steel frame guarantees perfect alignment for consistent sound delivery.
HIGH ENERGY PERFORMANCE - Optimized motor with ceramic ferrite magnet for superior efficiency.
UNMATCHED SOUND QUALITY - Experience deep, resonant bass that elevates your audio game.
VERSATILE COMPATIBILITY - Easily integrates into various audio systems for a seamless upgrade.

The GRS 8PR-8 8" Poly Cone Rubber Surround Woofer combines advanced materials and engineering to deliver exceptional audio performance. With a polypropylene cone for optimal stiffness and self-damping, a durable butyl rubber surround, and a precision-stamped steel frame, this woofer is designed for high excursion and long-lasting durability. Its optimized motor features a high-energy ceramic ferrite magnet and a vented pole piece, making it a perfect choice for audiophiles seeking quality and reliability.

Specifications

Model Name	4333165296
Speaker Type	Woofer
Recommended Uses For Product	For Speaker Systems
Compatible Devices	Gaming Console, Home Theater, Laptop, Smartphone, Television
Subwoofer Diameter	8 Inches
Surround Sound Channel Configuration	2.0
Item Weight	3 Pounds
Is Waterproof	FALSE
Warranty Type	Limited
Number of Items	1
Control Method	App
Wireless Communication Technology	Bluetooth
Speaker Size	8 Inches
Power Source	Corded Electric
Woofer Diameter	8 Inches
Vehicle Service Type	Car
Customer Package Type	FFP
Audio Driver Type	Dynamic Driver
Audio Driver Size	8 Inches
Includes MP3 player?	No
Number of Power Levels	1
UPC	844632088520
Indoor/Outdoor Usage	Indoor
Manufacturer	GRS
Item Weight	3 pounds
Product Dimensions	8.66 x 8.39 x 4.41 inches
Item model number	4333165296

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