Dipole or the out-of-phase signal/ ambiance

[TomekZ]

Recently, I've become aquainted with open baffled drivers, drivers in a dipole setting. There seems to be much more ambiant and harmonic information.

Decades ago, I had set up a third bookself speaker with the third speaker wired to the positive of both left and right amp terminals. This was inspired by the writing on the back of a Brian Eno alblum. He had suggested this to bring out the ambiance of his ambiant compositions. Wired this way, the out-of-phase signal (the back wave) of the left and right channel is brought forward; also wired as such the third speaker does not reproduce any common signal (center, shared signal) of the two main speakers.

So with a dynamic (cone) driver, placed in a box, is not much of the sound lost within the echo chamber of the box?