Magna Alert 120, Руководство пользователя

Страница: 9 / 16

Connection
100V Line System
Connect the rear IEC inlet to the mains using
the supplied mains lead (or an equivalent
approved type). Alternatively, the amplifier
can be powered by a 24V battery, such as a
lorry or boat battery, by connecting the “+”
and “-” of the battery to the DC24V IN on the
rear panel.
• Ensure that all DC cables are capable of
handling the required current
(10A min. recommended)
The amplifiers have a total of 4 input
channels. MIC 1 input is fed to a dedicated
microphone channel. Connect the main
announcement microphone to this channel
using a balanced XLR lead, or a good quality
6.3mm jack. Microphones or mono line inputs
connected to the MIC 2/LINE 1 and MIC 3/
LINE 2 inputs use a good quality 6.3mm jack.
Make sure the correct sensitivity is selected
for the type of input source.
Connect any other line level audio inputs to
the LINE 3 and LINE 4 connectors on the rear
panel using good quality RCA phono leads.
Since the amplifiers have a mono output,
stereo signals will be summed together.
Further mixer-amplifiers or slave amplifiers
can be connected from the rear LINE OUT
sockets, again using a good quality RCA lead.
This output carries the full mix of all channels
1 – 4 as produced through the speakers. The
terminals of a 100V speaker are connected
to a transformer and in some cases, this
transformer may be “tapped” for different
power ratings.
These tapping’s can be used to adjust the
wattage (and output volume) of each speaker
in the system to help achieve
A 100V line speaker system can comprise
of as many speakers as the amplifier can
handle. The determining factor for how many
speakers can be used on a single amplifier
is the power rating. For most purposes, it
is advised to connect as many speakers as
needed with a combined wattage of no more
than 80% of the amplifier’s output power
rating.
Speaker Terminals
TheΩterminalsareoffering3lowvoltage
outputs4Ω,8Ω,16Ωdependingonyour
speaker combination.
A 70V/100V commercial output is also
available. Please note that one wire only
should be connected to COM screw and one
wire to the selected impedance or voltage.
DANGER: Combinations of 70V, 100V
andΩcannotbeconnectedtothe
output at the same time.
Five different types of connections are
provided.Thelowimpedancesection:4Ω,
8Ω,16Ωisdesignedforasmallnumberof
speakers to be connected to your amplifier.
The 70V/100V section is especially designed
for multiple speaker distribution. When using
the 70V/100V output, the speakers used have
to be equipped with 70V/100V transformer.
The total wattage set on the secondary side
of the transformers on your speaker line must
not exceed 80% output power: 30W, 60W
or 120W. Failure to respect this may cause
permanent damage to the amplifier.
In the UK, the 100V line systems is the norm,
whilst in America the 70V line system is
preferred.