Jim Holtz's:
Crossover design:

Curt:
Once again a similar topology to the Statements was used, and the
Mini Statements were used as a voicing reference, along with the original
reference speakers used for the Statements voicing.  Due to the close
proximity of the drivers with respect to each other, I found this speaker to
integrate extremely well, even at close listening distances.

The woofer network again sports a simple 2nd order electrical circuit that
emulates a 2nd order acoustic response, and crosses to the mid around
330 Hz. If you've been following the release of the various Statement
designs, the midrange topology will look very familiar to you by now. L2011
and C2031 comprise the low pass filter, C2021 is the high pass filter.
C2011 works in conjunction with L2011 as an elliptic filter to attenuate the
driver response peak at 15 kHz. The mid crosses to the tweeter around
4700 Hz with a 3rd order acoustic transfer function. The tweeter is a 2nd
order electrical filter, which sums to provide a low Q 3rd order acoustic
transfer function at about 4200 Hz. The midrange and tweeter are both
connected in inverted phase with respect to the woofers, and sum in phase
quadrature. Consequently, reversing the phase of the tweeter does little to
affect the on axis response, but does affect the vertical polar response.

Placement Tips:

Curt:
Center channel speakers represent a challenge to the designer as
there are so many environmental options: Above, below, or behind the
screen, placement adjacent to the large screen and other surfaces, or
tucked inside a HT cabinet: All permutations will affect the resultant sound
is some form or another, due to differences in the apparent baffle size,
diffraction effects, etc. As a nod to all possible permutations, I voiced it with
the design axis perpendicular to the plane of the baffle and sitting on, but
not flush with, a 24" x 18" base.

As designed, the
main vertical lobe of the mid/tweeter angles up
approximately 7 degrees from the design axis. This allows the speaker to
work well when placed below the screen and the mid/tweeter height is below
or equal to the listening height. However if your placement is above the
screen and listening height, you have a couple of options. One is to simply
flip the speaker upside down so the tweeter is orientated below the
midrange. The other option, should the preceding one upset your
sensibilities, would be to reverse the tweeter leads. This will have the effect
of reversing the position of the vertical lobe with respect to the design axis,
but do little to affect the power response.

Click here for the vertical polar plot

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Enclosure drawings courtesy of Brian Walter