In a bi-amping arrangement the signal paths for the bass and mid-range/treble
ranges are separated before they reach the power amplifiers.
In the horizontal bi-amping version, one stereo power amplifier is used to
amplify the bass range for both channels, while a second stereo power
amplifier drives the mid-range/treble range of both channels.
Advantage: symmetrical load on the power amplifier mains power supply for
both channels.
Disadvantage: the power amplifier determines the channel separation.
In the vertical bi-amping version the power amplifiers work in a strictly
channel-separate arrangement.
One stereo power amplifier amplifies the signals for one loudspeaker: one
channel drives the treble/mid-range, the other channel the bass range.
Advantage: maximum channel separation in the power amplifiers. Power
amplifiers can be located close to the speakers, therefore short speaker leads
can be used.
Disadvantage: asymmetrical load on the power amplifier mains power supplies
due to bass processing on one side and mid-range/treble processing on the
other.
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