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AMP-7040
3.0 Connectors, Indicators, and Controls
3.1
Rear Panel
The Power input jack is used to connect the supplied 24 V adapter. The red LED indicates the
system power status.
Two separate audio inputs mix together are output at the 70V/100V terminal block. MIC In is
always on and either the Line or SPDIF inputs.
The speaker output audio is a mix of these two inputs. You can control the level of each used
from the front panel as described below.
Within the Line/SPDIF IN group, there are three inputs labeled A and B and C. Only one can
be active at a time based on the selection made from the front panel.
The SPDIF input only supports LPCM 2 channel formats.
Within the MIC IN group is a balanced 3 terminal detachable screw-type connector. There is a
3-position slide-switch next to the screw terminal to select the type/level of the Microphone
input signal as described below:
Phantom: Use this position for microphones requiring phantom power such as
condenser microphones. Typical input level for this mode is (-48 dBV, -45 dBu) or
around 4 mv rms sine wave.
Dynamic: This position is for dynamic microphones with low-level outputs. Typical
input level for this mode is (-60 dBV, -58 dBu) or around 1 mv rms sine wave.
Wireless: This position is for microphones that output full consumer line level, such
as wireless microphone receive outputs.
Within the EXT CTRL group is a screw terminal block for RS-232 (see related section below)
and IR jack for connection of the optional IR detector cable. The ID selector uniquely groups
units when connected in a RS-485 configuration using a single RS-232 port. (RS-485 to RS-
232 adapters not included)
Within the OUTPUT group is a screw terminal block for 70 and 100 volt speakers. Use the
appropriate terminals depending on the speakers being used.
The COM terminal is the common connection for all speakers.
Connect multiple speakers in parallel with a maximum of 40 watts total available.
4
© Copyright 2019 Hall Research, LLC.
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