Magnepan CCR - Manual (Page 7)

To drive your subwoofer with this configuration, install a Y-adapter on both
the left and right preamp outputs of the processor. The subwoofer and the
power amp will be driven by the same left or right full-range signal. Use the
electronic crossover in the subwoofer to set the low pass frequency. Be sure
that the left/right "large" Maggies are set for "large" with no roll-off of the bass.
Since the signal from the front left/right pre-amp outputs is "full range" (down
to 20 Hz), the subwoofer will receive all the deep bass information. When the
processor is set for "no subwoofer", the bass from the .1 (LFE) is routed to the
"large" front left/right Magneplanars. The LFE bass which is sent to the left/
right "large" speakers is in mono. If your subwoofer has only one input, it is not
absolutely necessary to drive the subwoofer with both the left and right signal.
(Note- The .1 or LFE bass information will NOT damage your left/right
Magneplanars.)
The benefits of achieving the illusion of a full-range Magneplanar in the center
channel with this hookup technique will be appreciated 100% of the time. But,
what about the absence of the .1 channel? All the same bass from explosions,
etc. from the .1 channel are on the "full range" or "large" front channels and
will be sent to the subwoofer with our recommended hookup.
To prevent "muddy" bass, adjust the subwoofer crossover point and level so it
does not overlap with the "full-range" front left/right Magneplanars. The goal
of a Magneplanar home theater system is quality over quantity. Excessive deep
bass does not enhance realism.
The final steps in checking phase and center channel bass response is to
confirm that the front left/right speakers are in-phase with the CCR and that
the center channel bass/midbass is in-phase with the CCR. (Again, this can get
a little confusing.)
First, using a standard test DVD, confirm that the CCR is in-phase with the
front left/right speakers. When in-phase, the audio test signal image will
appear between the CCR and either of the front left/right speakers. Then, using
the Magnepan DVD test disc, check the phase between the CCR and the center
channel bass/midbass provided by the full-range left/right speakers.
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