AMPLIFIER OPERATION GUIDANCE
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 24VDC INPUT on the rear panel.
Ensure that DC cables are capable of handling the 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. Connect microphones or
mono line inputs to MIC/LINE 2 and MIC/LINE 3 inputs using good quality 6.3mm jack leads. 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 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
connected together. 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
The Ω terminals are offering 3 low voltage outputs 4Ω, 8Ω, 16Ω depending on your 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.
WARNING:
Multiple combinations cannot be done at the output level.
Five different types of connections are provided. The low impedance section: 4Ω, 8Ω, 16Ω is
designed for a small number of speakers to be connected to your amplifier.
The 70V/100V section is especially designed for a multiple speaker distribution. When using the
70V/100V output, speakers 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 70W line system is preferred.
