JB568,

here is the information you requested (from June 30, 2001)

see:
http://www.softronix.com/ubb/Forum1/HTML/000557.html

Here is a quote from an email I received from Mr. Robert Stuart:

Quote
Q. Why are there Centre EQ settings?

A. Centre EQ is a unique function in the Meridian processors and illustrates
the thinking behind our designs. Centre EQ provides a psychoacoustic
function to compensate the timbre when using a real centre speaker on
content that may have been mastered for phantom (e.g. two-speaker stereo).

Explanation. Most music CDs are mixed for 2 speakers.

We prefer to replay such recordings in Trifield or Music modes. Part of
getting it right is understanding how the human listener perceives a phantom
centre compared with a real one.

The human auditory system presents a different frequency response for sounds
coming from different directions (this is one way we can tell direction) and
so the timbre of a centre image created only by left and right speakers will
be different from the same sound actually arriving from centre front.

The EQ1 and 2 settings provide difference functions so that the real centre
has similar timbre to a phantom. The two choices allow for human and
speaker-angle variation and are selected by listening.

Centre EQ is not provided in discrete or Logic modes because the assumption
is that the mastering engineer was using a centre speaker.

No doubt we will have other interesting features like this to add in the
future.

Happy listening.

All I can say is: center channel eq mystery, no more [Linked Image from softronix.com]

Thank you Mr. Stuart.

- Jerry

ps- allow me a little "chest pounding moment": Trifield rules!

Best regards,
Jerry
Main System: 861v6, DSP8000s in corners, DSP7000s Center and Sides, 1-9 humans.