Speaker Outputs - Adastra RM1202 User Manual

Speaker outputs

The RM1202 has a separate speaker output for each zone (27, 28) connected via a single terminal block.
The block is removable to enable easy access to the screw terminals.
Each zone output can be used to power either 100V line speakers or standard 4Ω or 8Ω speakers.
These configurations cannot be used together, so it is important to decide which will be used at the start.
100V line systems
For 100V speakers, connect the selected zone output to the first speaker in the zone using double-insulated speaker wire
which has adequate current rating to handle the total output of the amplifier.
Connect the "100V" output terminal for the selected zone to the positive (+) connection of the speaker and "COM" output
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.
A 100V line speaker system can comprise of many speakers 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 90% of the amplifier's output power rating (in the case of
the RM1202, this is 120W per zone output)
The terminals of a 100V speaker are connected via a transformer and in some cases, this transformer may be "tapped"
for different power ratings. These tappings can be used to adjust the wattage (and output volume) of each speaker in a
zone to help achieve the ideal total power of the system for the relevant zone output.
Low impedance systems
Alternatively, each zone output of the RM1202 is capable of powering one or more low impedance speakers.
There is an option on each zone for either a 4Ω or 8Ω speaker output to determine the minimum impedance.
It is essential to select the correct output terminal when opting for low impedance speakers.
For a single 8Ω speaker, connect the positive (+) wire to the "8Ω" terminal and the negative (-) wire to "COM"
For a single 4Ω speaker or for 2 x 8Ω speakers connected in parallel, connect the positive (+) wire to the "4Ω" terminal
and the negative (-) wire to "COM"
In either case, the connected load should have a combined impedance no lower than stated on the terminal.
Lower impedance may cause irreparable damage to the amplifier.
The connected speaker(s) must also have a power handling to accept up to 120Wrms from the zone output.
Lower power handling may risk damage to the speakers.
953.163UK User Manual