MartinLogan Vista Specifications download pdf (Page 9)

Connections 9

Horizontal Passive Bi-Amplification

Horizontal bi-amping allows you to use two different

types, models or brands of amplifiers (i.e. tubes on top,

transistor on the bottom). However, we recommend

that you use two identical amplifiers (i.e. same brand

and model). If you must use two different amplifiers, it is

essential that they have the same gain or that one of the

two have adjustable gain so that you can match their gain

characteristics. If the amplifiers of choice do not have the

same gain characteristics, 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 Vista’s 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 speak-

ers. Connect the high frequency amplifier to the upper set

of binding posts. Next, connect the left and right pream-

plifier 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 Vista’s

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 amplifier (see figure 5).

Active Bi-Amplification

We do not recommend active bi-amplification of Vista.

The internal crossover can not be bypassed. This connec-

tion method seriously degrades the Vista’s performance.

Figure 4. Horizontal bi-amplification connection. One channel shown.

Figure 5. Vertical bi-amplification connection. One channel shown.

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MartinLogan Vista Specifications Page 9