d&b audiotechnik J-INFRA, Руководство пользователя

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The two channels are tuned to create a cardioid dispersion pattern
thus providing maximum rejection to the rear.
2.3.1. Controller settings
When J-INFRA cabinets are placed close to J-SUB cabinets the
standard mode is selected.
For acoustic adjustment the 70 Hz and HCD function can be
selected.
70 circuit
When J-INFRA cabinets are located remotely from J-SUB cabinets
there is less coupling between the systems. Selecting the 70 Hz
circuit compensates for this effect by extending the upper
frequency limit to 70 Hz.
HCD circuit
Cardioid polar pattern Hypercardioid polar pattern
Selecting HCD (Hypercardioid) optimizes the tuning of front and
rear channels for a maximum rejection at the left and right sides
behind the cabinet providing a hypercardioid dispersion pattern.
This characteristic is particularly useful for a setup with subwoofers
stacked at the left and right sides of a stage providing minimum
interference onstage.
HCD mode can be used either freely radiating or in front of walls.
The minimum distance to rear walls is provided by the wheels on
the cabinet back. Even in HCD mode adjacent columns of J-SUBs
have to be at least 60 cm (2 ft) apart.
d&b J-INFRA Manual 2.2 en 7