MartinLogan E2 - Manual (Page 24)

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 (Transition) section while the right channel drives the
high pass (ESL) section. Starting with one speaker, connect
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 preamplifier outputs
to both inputs of the left channel amplifier and the right
preamplifier outputs to both inputs of the right channel
speaker (See Figure 50).
24 Connections—ESL/Transition Towers
Vertical Passive Bi-Amplification
Figure 50. Vertical passive bi-amplification. One Channel shown.