is the speaker 12" from the edges of the whole thing or from just the actual speaker

overall size is 12", fits enclosure hole size of 11.25", mounting depth is 4.75"

Does this sub sound best in a sealed or a ported box? And also what is the ideal size box for this sub?

A ported box. My speaker is 18 inches by 30 inches.

are this sold as a pair?

This is for 1 piece, but you can buy 2 for a pair!

Can i use 2 of these 12" at 8 ohm on a dayton audio spa300-d (4 ohm) on low pass? trying to build a bass buttom for my self powered 15" mid/high top

The unit I got was not rated at 250 watts. It was maybe, 100 watts peak. If you used them that way, you would have to wire in parallel to get to 4 ohms. I don't recommend these speakers for hi power bass applications; very cheaply made. Just look at how tiny the magnet is. Very small voice coil.

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Description

🔊 Elevate your sound game—because your ride deserves bass that speaks volumes!

POWERFUL 240 W OUTPUT - Feel every beat with deep, room-filling bass that commands attention.
UNIVERSAL COMPATIBILITY - Perfectly pairs with car systems, gaming consoles, laptops, and smartphones for versatile use.
PRECISION 12 INCH WOOFER - Engineered for rich, immersive sound that elevates your car audio experience.
COMPACT LIGHTWEIGHT DESIGN - At just 2.15 kg, it fits effortlessly into your vehicle without compromising space.
SEAMLESS BLUETOOTH CONNECTIVITY - Cut the cords and enjoy wireless subwoofer integration with your devices.

The Goldwood GW-212/8 is a 12-inch OEM subwoofer delivering 240 watts of powerful, dynamic bass through an 8 Ohm impedance. Designed for versatile compatibility with car audio systems and multiple devices, it features wireless Bluetooth connectivity and a compact, lightweight build for easy installation and superior sound performance.

Specifications

Model Name	GW 2122/8
Speaker Type	Woofer
Special Feature	Subwoofer
Compatible Devices	Car Audio System, Gaming Console, Laptop, Smartphone, Tablet
Subwoofer Diameter	12 Inches
Surround Sound Channel Configuration	1
Age Range (Description)	Adult
Item Weight	2.16 kg
Impedance	8 Ohm
Is Waterproof	false
Control Method	Voice
Wireless Communication Technology	Bluetooth
Speaker Size	12 Inches
Power Source	12V
Woofer Diameter	12 Inches
Vehicle Service Type	Car
Audio Driver Type	Dynamic Driver
Audio Driver Size	12 Inches
Subwoofer Connectivity Technology	Wireless
Connectivity Protocol	Bluetooth
Includes MP3 player?	No
Number Of Circuits	1
Series number	212
Model	GW-212/8
Product Dimensions	30.48 x 12.07 x 30.48 cm; 2.15 kg
Item model number	GW-212/8
Special Features	Subwoofer
Audio input compatible with the item	Auxiliary
Noise Level	88 dB
Audio Wattage	240 Watts
Wattage	240 Watts
Batteries Included	No
Batteries Required	No
Does it contain liquid?	No
Item Weight	2 kg 150 g

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