MartinLogan Odyssey - Manual (Page 7)

amplifiers of choice do not have the same gain charac-
teristics, then a sonic imbalance will occur.
With horizontal bi-amping, one amplifier drives the high
pass (ESL) section while the second amplifier drives the
low pass (WOOFER) section. To horizontally bi-amp your
Odysseys you must loosen the binding posts and remove
the jumper clips. Connect the low frequency amplifier to
the lower set of binding posts of both speakers. Connect
the high frequency amplifier to the upper set of binding
posts. Next, connect the left and right preamplifier outputs
to the appropriate left and right inputs of both amplifiers
(See Figure 4).
Vertical Passive Bi-Amplification
The very nature of vertical bi-amping dictates that both
amplifiers be identical. With vertical bi-amping, each of the
stereo amplifiers is dedicated to one speaker. For instance,
the left channel of each amplifier drives the low pass
(WOOFER) section while the right channel drives the high
pass (ESL) section. To vertically bi-amp your Odysseys you
must loosen the binding posts and remove the jumper
clips from both speakers. Starting with one speaker, con-
nect the right channel to the lower binding posts and the
left channel to the upper binding posts. Repeat the same
procedure for the other speaker. Connect the left pream-
plifier outputs to both inputs of the left channel amplifier
and the right preamplifier outputs to both inputs of the
right channel speaker (See Figure 5).
Bass Control Switch
On the rear panel of the Odyssey electronics module,
beside the Signal Input binding posts, is a two position Bass
Control switch that allows you to select the type of low fre-
quency response you desire.
The flat position is considered the normal setting for most
rooms. However, if you feel that the bass in your system is
too strong relative to the mid and high frequencies, simply
select the -3 dB position. This switch position will decrease
the output of the woofer by 3 dB centered around 150Hz.
Some experimentation with these two switch settings will
allow you to find the optimal tonal balance for your specific
taste, room and equipment.
Figure 4. Horizontal passive bi-amplification. One Channel shown.
High Amplifier
speaker output
Low Amplifier
speaker output
ESL
Woofer
Jumper clips
removed
O
DYSSEY TM
Bass Control
-3dB
flat
Figure 5. Vertical passive bi-amplification. One Channel shown.
Left Channel Amplifier
speaker output
ESL
Woofer
Jumper clips
removed
O
DYSSEY TM
Bass Control
-3dB
flat
Operation 7