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

Product ID: 440574860

Details

Audio output mode
Surround
Brand
GRS
Connectivity technology
Bluetooth
Mounting type
Flush Mount
Speaker maximum output power
600 Watts

🔊8-inch dynamic driver

⚙️High-energy ceramic ferrite magnet

🛡️Butyl rubber surround for durability

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R$1140

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Description

🎶 Elevate your bass game with precision-engineered power!

OPTIMIZED MOTOR SYSTEM - Features a high-energy ceramic ferrite magnet with a vented pole piece for enhanced power handling and heat dissipation.
ROBUST STAMPED STEEL FRAME - Keeps all components perfectly aligned, guaranteeing consistent audio quality and reliability.
PRECISION POLYPROPYLENE CONE - Engineered for the perfect balance of stiffness, mass, and self-damping to deliver crisp, distortion-free bass.
DURABLE BUTYL RUBBER SURROUND - Ensures high excursion and long-lasting performance, so your sound stays powerful session after session.
SEAMLESS BLUETOOTH CONNECTIVITY - Easily integrates with your home theater, gaming console, or car audio system for wireless, immersive sound.

The GRS 8PR-8 is an 8-inch poly cone woofer designed for superior bass performance in sealed-box applications. Featuring a polypropylene cone for optimal stiffness and damping, a durable butyl rubber surround for extended excursion, and a stamped steel frame for structural integrity, it delivers clear, powerful sound. Its optimized motor with a high-energy ceramic ferrite magnet and vented pole piece ensures efficient power handling. Bluetooth compatibility adds modern wireless convenience, making it ideal for car audio and home theater setups.

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	#144,943 in Electronics ( See Top 100 in Electronics ) #169 in Car Component Subwoofers
Brand	GRS
Built-In Media	Speaker
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	4.4 4.4 out of 5 stars (234)
Enclosure Material	Polypropylene
Is Waterproof	FALSE
Item Weight	3 Pounds
MP3 player	No
Manufacturer	GRS
Model Name	8PR 8
Model Number	4333165296
Mounting Type	Flush Mount
Number of Audio Channels	1.0
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
Tweeter Diameter	8 Inches
UPC	844632088520
Water Resistance Level	Not Water Resistant
Wireless Technology	Bluetooth
Woofer Diameter	8 Inches

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R$1140

Duties & taxes included

In stock

Sold byAmazon BrazilDelivered 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 Brazil.

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TrustScore 4.5 | 7,300+ reviews

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