Hill Audio IMA-400 V2, User Manual

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MOH Signal output. This output is designed to feed the music-on-hold (MOH) input of a
telephone system, which requires the built-in transformer isolation. The output can however
also be used as a monitor output, operating at 0dBu line level. Both of these connection
options are consolidated into one 4-pin terminal block connector. For connecting the MOH
input of a telephone system, use the two contacts labeled “600 Ohms”, which indicate the
transformer isolated output (nominal level 0dBu, with attenuated low frequency response). For
connecting to an external monitor system, use the two contacts labeled “LINE (0dBu)”. The
signal present at the MOH output can be mixed by the two rear-side controls (12 & 13) from
one internally selectable music source and the microphone (for pure MOH purposes, the mic
volume shall be set to zero). The music source selection is expedited by internal jumpers (see
chapter “setup information”, jumper JP3). Note that the front-panel controls of the unit have
no influence on the MOH signal, and that the Emergency and Music Mute functions are not
affecting the MOH output as well.
MOH Mic level control. Adjusts the microphone level contribution to the MOH signal (11). Turn
this control to zero for pure MOH applications.
MOH Music level control. Adjusts the music level contribution to the MOH signal (11). The
music signal source is selected by internal jumper JP3 (see chapter “setup information”).
External Chime Trigger. Allows to remotely invoke the internal Chime Sound generator by clos-
ing these contacts.
Stereo Link (SL) preamp output. This is a pair of 1/4’’ TRS sockets which carries a balanced
line level signal. The signal is the same as the signal at the MAIN speaker output (20 or 21),
but on line level, in stereo and unaffected by the MAIN volume controls (6 and 36).
Line Inputs. These are 3 pairs of RCA input jacks, with one of the signals fed into these inputs
being selectable as the music source via the source selector (33) and then being controllable
in its volume via the music volume control (35). The input gain is adjustable via controls (17).
GAIN control for input channels. This allows the sensitivity (input gain) for every line input to be
adjusted, so that sources of different output level can be played at properly balanced levels.
Microphone inputs (rear side). This are balanced ¼” TRS connectors, which can be internally
set to either carry phantom power (+12V DC) or not, thus this input can be used both with
condenser and dynamic microphones (see chapter “setup configuration”, jumper J7, J8, J9 -
default is phantom power = OFF). Note these inputs are paralleled with the front-side mic
inputs (25); do not connect a microphone to both front and rear input, but to either or.
GAIN control for microphone inputs. These controls allows the sensitivity (input gain) for the
input to be adjusted to the microphones in use.
Aerial socket. Plug in the supplied FM antenna here, or connect any suitable antenna cable of
the house installation here (75 Ohms cable).
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USER MANUAL - IMA400V2 INSTALLATION MIXING AMPLIFIER