Let’s see how this works in detail: Figure 1 (see below) shows an example of how to mount the Subgroup unit(s). If you are only using two Subgroup units, which in most of cases should be sufficient, the mounting process is very simple: One Subgroup should be positioned to the left of the L/R master and the other sub group to the right.
The first step in mounting a sub group is to set the Master Side Switch, which you will find inside the module on the circuit board, near the BUS connector. If the L/R Master is to the right of the Subgroup, do not depress the Master Side Switch. If it is to the left, then depress it. This obviously has to be done before the sub group is connected to the other units.
Once the mixer is put together, one of two LEDs will light up showing which side has been ed. The group of units being controlled via the Subgroup should be positioned “before” the sub group unit, i.e. on the opposite side from the L/R Master unit. Depress the back to L/R button to let the summed signal flow back to the L/R BUS. Any other input units that are next to the L/R master on its left or right sides will be summed by the L/R master and will not be affected by the Subgroup unit(s). An ARTHUR mixer using two Subgroup could therefore be configured as follows, working from the mixer’s left hand side: Input units controlled by the first sub group – the Subgroup itself (master side switch not depressed) – the independent inputs not affected by the sub group – the master L/R unit – another set of independent inputs (if necessary) – the second Subgroup (master side switch depressed) – the input units controlled by that second sub group