That's quite a collection of CDs... not to mention cylinder subs (?)!
The big 30"(id) tube in the corner was my main woof for a couple of years while I tried dozens of other designs. Building, measuring(inside and outside), and then rinse and repeat. Some of those tubes in the picture can be considered early SVS proto types.
Here is what a measurement day looked like back in 2000(?)
Tom V.
Power Sound Audio