Hill Audio VMA-1240, Руководство пользователя

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Line level (Constant Voltage / High impedance) output. This amplifier is fitted as standard with
an output transformer that can be enabled by moving an internal connector (see chapter
“setup configuration”). The transformer should be placed in circuit if the amplifier is to be used
with a 100 V, 70 V or 25 V line speaker distribution system. Once the output transformer is
enabled, make sure that the provided safety cover is fitted over the connector (21), which may
have been removed to connect the speaker cable. Note that the transformer secondary has
3 line outputs: 100 V, 70 V and 25 V; whilst these have a common 0 V connection, the output
is fully floating i.e. it is isolated from the rest of the amplifier. When the transformer is in use
the maximum total combined load should not exceed the rated power of the amplifier. Note
that this output can NOT be used at the same time as the Low impedance speaker output
(20). To avoid simultaneous use, the unit has to be internally configured for either Low imped-
ance or Line level operation. As a factory default, this Low Impedance output is active, and the
Line level output (21) is disabled. Once this Line level output (21) is enabled, the Low imped-
ance output (20) will be disabled.
Fan cover. For extended reliability under full rated power, this amplifier has an internal cooling
fan. Make sure to not obstruct the fan vent, and also keep the fan inlet on the front panel clear.
Aerial socket. Plug in the supplied FM antenna here, or connect any suitable antenna cable of
the house installation here (75 Ohms cable).
Bluetooth aerial socket. Plug in and secure (by turning the threaded cover) the supplied BT
antenna here. Do not use any other than the supplied antenna, and do not operate the Blue-
tooth option without mounted antenna as this may result in inferior operational range. In case
the unit is rackomunted, the included antenna extension kit can be used, which allows to
mount a secondary aerial socket in one of the rack ears, and connect this to the rear side
aerial socket. The antenna is then mounted in the rack-ear mounted secondary aerial socket.
Microphone inputs (front side). This are balanced Combo TRS/XLR 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 rear-side
mic inputs (18); do not connect a microphone to both front and rear input, but to either or.
Microphone volume controls. These rotary controls adjust the volume of the microphones
connected to the inputs (18/25).
Microphone On-Off switches. Enable the relative microphone when being pressed, and disable
the microphone when being released. A LED indicates enables status.
Microphone Equalizer. Allows the adjustment of the tonal balance for each microphone input
separately in two voice-specific frequency bands with an adjustment range of ±10dB.
TALKOVER On/Off switch. Engages or disengages the talkover function, which allows to
reduce the music level automatically when the microphone is spoken into (also called priority).
The amount of damping applied to the music signal is controlled by the damping control (30).
Talkover Damping Control. Provided the talkover on/off switch (29) is set to ON, this control
determines the amount of damping applied to the program signal when the microphone is
spoken into. Turn clockwise for more attenuation, counterclockwise for less.
Chime switch. Invokes replay of the stored Chime sound. Refer to the chapter “chime player
sounds” for more information about Chime sounds. Can also be invoked remotely via (14)
Chime volume. Adjusts the volume of the chime sound replay.
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USER MANUAL - VMA1240 INSTALLATION MIXING AMPLIFIER
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