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(Drew Eckhardt) wrote:

In article b8U5b.266601$cF.84154@rwcrnsc53,
Franco Del Principe wrote:
What if an exactly centered voice moves during the playback
within one and the same song?

Asymetric speaker placement w.r.t. the room and differences in the
adsorbtion/diffusion of the side walls both create frequency dependant
left/right image shifts. This was real bad in my office where there's
a book shelf along one wall, the speakers needed to be close to the side
walls,
and I ended up using different bass/treble settings on the two channels
to maintain a stable image.

We may have similar vertical effects because carpet/pad adsorbtion decreases
with frequency and the relative phase of reflections when they reach your
ears
(resulting in boost/attenuation) is also frequency dependant.

Controlled dispersion speakers (my personal experience is with dipoles and
MTM arrays; although horns/cardoids should work in similar ways) suffer
much less from these effects.

The changes may also be on the recording.

Is there someone sharing the same experiences? Are there
more convincing, i.e. experimentally proven explanations for
this effect? And what is the remdy? Is there at all such a
thing like an audio gear producing rock-solid imaging? Or is
it so much depending on the listening room?

Controlled dispersion with adsorbtion at the first points of
reflection is probably a good place to start.

IMO the most usual explanation is the lack of a dedicated center channel and a
suitable decoder.