* 3 pictures are worth 3,000 words *

Actually, except for my first DIY speaker [1952 oval AM radio 'dashboard' driver in a Kleenex box], the next few were 12", 15" out of AM, shortwave radio, phono floor consoles just screwed to a piece of 2x4 scrap since the only space I had in my bedroom was one corner.
 
I once had a 15 or maybe it was an 18 in the corner of my bedroom as a teen... It was even driven by its own amp - a "plastic tiger" from SWTPC. I labeled the volume control "Dig The Bass". With one of those peel and stick plastic strip labelers.

Stuck it atop a cardboard barrel I found and cut a hole in the side at the floor end - boomed nicely as I recall. I remember sticking a blown 4" Goodmans woofer in the hole, watching the little cone flap about while the big driver barely moved. I recognized there was some kind of ratio going on there.

Along time ago, I was given every opportunity to excel in something like "subwoofers". As I drooled over the Phillips speakers with cone motion feedback I read about in Popular Electronics... Unfortunately, I lacked the quality of "conscious, meticulous investigation" which I still struggle with 45 years later. I could have tried so many things with that setup I was given; instead it never went further than setting the big speaker atop a cardboard barrel and cutting a hole in the side.

My father had all the tools and materials to, say, actually mount the big speaker to the barrel end in a good way, cap the opposite end, paint it, etc. But nope, just set it there - done! Oh well - maybe that's what this incarnation is all about!?!
 
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I have found ( been granted the knowledge )
that a 10 " driver fits perfectly into the bottom
of a 5 gallon paint can , while a 8 " likewise
fits into a 2 gallon can .

5 gal :
Wall thickness: 0.075" ±0.005"
Dimensions: 11.91" top OD (10.33" bot. OD) x 14.5" Hgt.

2 gal:
Wall thickness: 0.070" ±0.005"
Dimensions: 9.60" Top OD (8.14" Bottom OD) x 9.50" Hgt.