"Joe invalid" wrote \

The is 4" (I've got some about 2" too) ribbed hard plastic. The sound
seems to eminate only from the opening of the hose - there doesn't seem to
be any sound along the length of the hose, regardless of how much I attach
or how it's broken up, though some may be masked by the howl I'm
describing. It makes no difference if it's on the floor or suspended or
if 'pressure points' are applied along the hose that should stop any
vibrations.

This is likely a case of using the right tool for the job, but I have this
stuff, it would be convenient to use it, and I've seen what -looks- like
it in various shop photos and videos.

If you made it all the way through this epistle, thanks. Ideas are
welcomed. If you are using what even resembles this stuff, what is it?

If you take any ribbed tube and swing it around in a circle over your head
hard and fast enough, you will get a howl out of it. It is the ribs acting
like a whistle's splitter where you blow across the split. A hose like a
vacuum cleaner has ridges but they are in a spiral and they are not sharp,
so no noise...

Jim in NC