"Andy Evans" wrote in message


Does anybody know the effects of back radiation on the cone.

It can be very significant.

The simple method of dealing with this is to stuff behind the speaker, or
indeed to have cabinets with odd dimensions to avoid standing waves.

Some of the sonotube subwoofer enclosures I've seen were 6 to 12 feet long.
There could be a lot of *organ pipe* resonances if the tube was not properly
stuffed.

But I'm thinking that the actual length of enclosure behind the cone
is important.

It definately can be signficant. After all, that's what ported enclosures
work with, as do the unported ones.

Hence my plan was to use a larger diameter sonotube
horizontally, rather than a slim one vertically.

Consider the well-stuffed tube as a very lossy transmission line...