MAGNEPLANAR MMC 2, Руководство по установке

Страница: 22 / 23

d. A technique which can aid in determining if the phase is correct is by
leaning over and positioning your head equi-distance between the
Magneplanar Bass Panel and the "small" Magneplanar as shown in Bass
Panel manual.
Th e le ft and right ears are equi-distance to the respective
speakers. High frequencies will appear to be up and low frequencies will
appear to be down.
Th e 90-100 Hz peak, if in phase, will appear to be in
the middle (and louder). Since the Magneplanar Bass Panel is a dipole, the
rear wave is out of phase with the front wave. To reverse the phase for a
phase test, simple turn the Maggie Bass Panel around.
e. However, depending on where the Bass Panel is placed, it is possible for
the MMC 2s and the Bass Panel to be 90 degrees out of phase with the Bass
Panel.
Th is will result in little or no di ff erence in loudness of the peak as
the phase is changed. Usually, this means that the woofer is not placed at
the correct distance relative to the MMC 2s. Many powered woofers have
continuous phase shi
ft adjustments to correct this problem without
moving the woofer, although changing the location of the woofer is the
preferred solution.
L Bass Management and Processor Settings
a. Th e MMC 2 is a "small" speaker with limited midbass response. A high-
pass fi lter is required for the operation of the MMC 2s to roll o ff the bass
frequencies to the MMC 2s. Th e Magneplanar XO 2 passive crossover can
be used with the MMC 2s or if a processor is being used, the processor can
be set for "small" speaker.
b. Th e lower frequency response of the MMC 2 depends, to a large degree, on
the room acoustics and where the MMC 2s are used in the room. For
example, a front wall placement of the MMC 2s will result in less midbass
and therefore require a higher crossover point. A side wall placement of
the MMC 2s in a shoe-boxed shaped room (when placed about 4 feet or
more from the front wall) will give the deepest midbass response.
Crossover points may vary from 100 Hz to as high as 160-200 Hz,
depending on all the variables.
Revision-- 7-25-15 Page of 22 23