One foot
A 12-inch subwoofer can be purchased online through Amazon. Amazon is always putting products on sale and there would certainly be a 12-inch subwoofer there at a discounted price. Walmart also sells these items.
To cut a hole for a 12-inch subwoofer, you typically need to create an opening with a diameter of about 12.5 to 13 inches. This additional space allows for the speaker's frame and any mounting hardware. It's important to check the specific dimensions provided by the subwoofer manufacturer, as they may vary slightly. Always measure carefully before cutting to ensure a proper fit.
10 Inch
382 cubic inches of it.
It's a 9 inch woofer.
Depends on what kind of subs your getting because for your subs to sound properly and give you the best bass, there needs to be sufficient enough space behind the sub to allow the sub to displace air and thus create BASS!!.. The amount of space you need depends on what size of sub you have.. For example you need more space for a 12 inch sub then you do for a 10 inch sub.. Just look up specs for your subwoofer on google and you will see how much mounting depth it needs and buy a box that allows that space
Slot Port
Well, 18 inch subs are the biggest among this moment. There are bigger subs out there over 18 inch.
The Kicker 08DS12L72 has dual 12 inch enclosures.
132
The size of subwoofer is 8 inch
8 inch or 10 inch is nice. give you one nice guide