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2 Technical Features
Caution
There is no stopping position for the rotary control. If the switch is turned beyond –90dB setting
to the 0dB setting, the level will not jump from full attenuation to full power but remain in the
–90dB position.
This feature will prevent the destruction of connected equipment and/or injury of persons. As
the rotary direction is being sensed, it is necessary to turn the switch clockwise again to set the
amplifier to higher levels.
Please keep in mind that the position of the rotary control will be detected by a microcontroller
which will then set the according level of the amplifier.
If the amplifier was operated at full attenuation before turning it off with the rotary control
accidentally set to 0dB it will start up with full power!
In the opposite case it will start up fully attenuated at –90dB and you won’t hear any audio!
2.6 Audio Connections
The amplifiers may be operated with unbalanced or balanced lines. For optimum performance use balanced
lines whenever possible. The driving device should be equipped with a balanced output.
Nevertheless, short cables inside a rack are not that critical. In these cases unbalanced cables may be used.
Caution
Always turn off the amplifier before making any connections. As an additional precaution by
switching the amplifier on for the first time, turn the audio attenuators down during powering
up.
2.6.1 PHOENIX
The Phoenix audio connectors are electronically balanced. Each input contains three pins: Signal (+),
Signal (-) and Shield. Depending on the model more than one channel might be combined on the PHOENIX
connector.
2.6.2 XLR /TRS Jack
The amplifiers series BASIC, 4Xe and XR are equipped with two combined input connectors. They can be
used for regular XLR connectors and for 6.3 mm TRS jacks, mounted in the same connector chassis. The
audio inputs of the BASIC and XR amplifiers are electronically balanced.
Standard pinout for the XLR connectors:
1 - Ground, Shield | 2 - Signal (+) | 3 - Signal (-)
Figure 2.7: XLR Connector
c
2016 Bittner Audio Int. GmbH
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