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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GRS 8PR-8 8" Poly Cone Rubber Surround Woofer

GRS 8PR-8 8" Poly Cone Rubber Surround Woofer

Product ID: 1564978

Details

Brand
GRS
Speaker Maximum Output Power
600 Watts
Connectivity Technology
Bluetooth
Audio Output Mode
Surround
Mounting Type
Flush Mount

⚡600W max power output

🔊8-inch dynamic driver

🛡️Butyl rubber surround for durability

SAR 236

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Description

🎶 Elevate your bass game — don’t just hear it, feel it!

ROBUST STAMPED STEEL FRAME - Keeps all components perfectly aligned for consistent sound quality and reliability.
PRECISION POLYPROPYLENE CONE - Engineered for the perfect balance of stiffness and self-damping, delivering crisp, distortion-free bass.
DURABLE BUTYL RUBBER SURROUND - Ensures high excursion and long-lasting performance, built to withstand intense audio sessions.
HIGH ENERGY CERAMIC FERRITE MAGNET - Optimized motor design powers deep, punchy bass that commands attention.
BLUETOOTH CONNECTIVITY APP CONTROL - Seamlessly integrates with your devices for wireless, hassle-free audio management.

The GRS 8PR-8 is an 8-inch poly cone woofer designed for car audio enthusiasts seeking powerful, clear bass. Featuring a polypropylene cone and butyl rubber surround, it offers durability and high excursion. Its stamped steel frame and high-energy ceramic ferrite magnet ensure precise alignment and deep sound output up to 600 watts. Bluetooth connectivity and app control make it a modern, versatile choice for immersive audio experiences.

Specifications

ASIN	B0045506KU
Additional Features	Bluetooth
Antenna Location	For Speaker Systems
Audio Driver Size	8 inches
Audio Driver Type	Dynamic Driver
Audio Output Mode	Surround
Best Sellers Rank	#115,669 in Electronics ( See Top 100 in Electronics ) #220 in Home Audio Subwoofers #527 in Car Component Subwoofers
Brand	GRS
Built-In Media	Speaker
Color	black
Compatible Devices	Gaming Console, Home Theater, Laptop, Smartphone, Television
Compatible with Vehicle Type	Car
Connectivity Protocol	Bluetooth
Connectivity Technology	Bluetooth
Control Method	App
Customer Package Type	FFP
Customer Reviews	4.3 out of 5 stars 250 Reviews
Enclosure Material	Polypropylene, Butyl Rubber
Impedance	8 ohm
Is Waterproof	FALSE
Item Weight	3 pounds
Manufacturer	GRS
Material	Polypropylene , Butyl Rubber
Model Name	4333165296
Model Number	4333165296
Mounting Type	Flush Mount
Number of Audio Channels	2
Number of Items	1
Number of Power Levels	1
Power Source	Corded Electric
Speaker Maximum Output Power	600 watts
Speaker Size	8 inches
Speaker Type	Woofer
Specific Uses For Product	for car audio systems
Subwoofer Diameter	8 inches
UPC	844632088520
Warranty Type	Limited
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	8 inches

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Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

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TrustScore 4.5 | 7,300+ reviews

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The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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SAR 236

Duties & taxes included

In stock

Sold byAmazon KSADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to KSA.

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TrustScore 4.5 | 7,300+ reviews

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Good experience, but the tracking updates could be better.

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