Connection And Setup; Speaker Outputs - Adastra 953.113UK User Manual

Connection and setup

Connect the rear IEC inlet (14) to the mains using the supplied mains lead (or an equivalent
approved type). Ensure that the voltage is correct as indicated on the voltage selector (13) and that
the mains outlet is switched on.
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 (15) on the rear panel. Ensure that DC
cables are capable of handling the current (10A min. recommended)
The RM series amplifiers have a total of 5 input channels. MIC 1 input (25) 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 4 (21) and LINE 5 (20) connectors on the rear
panel using good quality RCA leads. Since RM series 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 – 5 as produced
through the speakers.

Speaker outputs

The RM series amplifiers can be used either as 100V line amplifiers or standard low impedance power
amplifiers. These 2 configurations cannot be used together, so it is important to decide which
method will be used at the start.
100V line systems
For 100V line systems, connect the amplifier to the first speaker in the system using double-insulated
speaker wire which has adequate current rating to handle the total output of the amplifier.
Connect the "100V" (18) output terminal to the positive (+) connection of the speaker and "COM"
output (16) to the negative (-) connection of the speaker. Connect further speakers in parallel to the
first speaker with all positive terminals and connected together and all negative terminals connected
together as shown below.
RM Series User Manual