Proel AUP120R - Manuale (Pagina 20)

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14. Description
The power units series AUP120/240/480R have been designed specifically
for microphone announcement and music diffusion in all PA installation
applications . The main features are as follows:
• One input/output balanced with XLR connector.
• One input/output unbalanced with RCA connector
• 4 Outputs : one output at constant impedance (8Ω) and three
outputs at constant voltage (25 – 70 – 100 V).
• A further output 100V available only for call and announcement
from microphone stand or telephone.
• Level indicator and overload led indicator.
• Input for one or more pre-amplified microphone stand BM100A
with priority function.
• One input for call from telephone central with VOX priority .
• Low & high tone control and general master.
• PA-HF Filter to be rear inserted.
• GROUND-LIFT rear selector.
• 24Vdc output with volume attenuator bypass during the
announcements .
• Main power selector (117 – 230 V ca).
• 24 Vdc for emergency power supply.
15. FUNCTIONS AND CONTROL
(1) Volume control
Such knob is used for output volume control.
(2) Led level indicator - Vu meter.
Gives an indication on signal level. For a correct amplifier use, the
volume level must be set between –20 dB e 0 dB indicated by ON
status of the first 5 LEDS , When the volume level makes only the
latest 2 LEDS ON status (+3 dB +6 dB), the output signal could be
distorted and the volume must be reduced