What Do You Think . . . and How Does It Work?

Here the thing though, cylinders, have an inherent characteristic to ECHO
and GAIN... not disappear, or blend like you want.. They're usually have pretty high mechanical distortion. Even with a lot of baffles..
Concrete pipe... ECHO, even long square tubes echo, and GAIN..

which is why im saying its not good. 

At the same thickness PVC is similar in strength to MDF

We are talking about the linkwitz pluto speakers. They are not concrete pipes. They are not 2 inch thick PVC. They are PVC pipes that are about 2mm thick. I dont want to hear any more excuses. Do you know how bendy 2mm thick PVC is? Theres nothing rigid about it 

Actually...

The PVC pipes used would have a minimum wall thickness that well exceeds 6mm.

DeKay

These PVC pipe speakers are all hearsay. NOBODY has done any comparisons to check if a $2 PVC pipe beats a $50k high end Wilson. 6mm is a joke. Even cheap box speakers use at least 15mm mdf. Do not be duped by this cheap PVC hogwash. 

" NOBODY has done any comparisons to check if a $2 PVC pipe beats a $50k high end Wilson."

Nobody is claiming that either.

But somebody is committing a straw man argument fallacy.

Duke

I think it’s generally agreed in the industry that a box is the worst possible shape for a loudspeaker cabinet.

The main reasons why most are built this way seems to be consumer expectations of domestic acceptability and manufacturing convenience.

The following extract is taken from diyaudioandvideo.com


What is the best shape for the box?

Internal reflections in the box combined with the vibration of the box itself can cause spikes in the frequency response of the system.

Different box shapes have different effects, with perfect cubes being the worst and spherical or egg shaped boxes being the best.

Although spheres have advantages, it is very difficult to create a spherical speaker box that is as strong as a typical rectangular box.

One good example of a spherical speaker is the Gallo Nucleus Solo above on the left which is made of rolled steel or brass.

An even better design is the sphere/tube concept by B&W shown on the right.

This design gets the benefits of a spherical design, but also adds a tapered tube at the back to eliminate all internal resonances.

Shape Variation
Cube +-5.0 db
Rectangle +-3.0 db
Cylinder +-2.0 db
Beveled Cube +-1.5 db
Beveled Rectangle +-1.5 db
Sphere +-0.5 db

https://www.diyaudioandvideo.com/Guide/BuildSpeaker/