Reference Monitors User Handbook
29
REFERENCE MONIT
ORS RM-4C8
REFERENCE MONITORS RM-4C8
2
Bank Selector
Pressing the left-hand Source selector knob inwards steps sequentially through all
available input Banks (groups of four inputs). Each press moves the selected Bank onwards
by one step; once the last available Bank is selected, a further press returns the selection
to the first available Bank. The currently selected Bank is indicated by illumination of the
corresponding Bank LED. The currently selected Bank may also be changed via the remote
control ports (see the appropriate sections of this manual), and such changes will also be
reflected by the Bank LEDs.
As standard, the RM-4C8 possesses two Banks, A and B. Both comprise four monophonic
Sources, each of which may be a mono analogue signal, part of a stereo analogue signal,
part of a stereo AES/EBU digital signal or any combination thereof. Attaching a valid AES/
EBU digital signal automatically assigns its two channels to a pair of Sources. Further Banks
become available with the addition of optional expansion cards. It is not possible to select
Banks which are not fitted.
When mains power is removed, the currently selected Bank is stored in non-volatile
memory and recalled instantly once power is restored.
When the RM-HD1 expansion card is fitted to the RM-4C8 the banks EX A, EX B, EX C
and EX D become available for selection. These are used to select which audio group is
de-embedded and monitored from the SDI input connected to the unit.
Bank
Embedded Audio
Group
EX A
1
EX B
2
EX C
3
EX D
4
Channel pair 1 is displayed on meters 1 and 2, while channel pair 2 is displayed on meters
3 and 4. The two rotary Source selectors work as normal and determine which of the
channels are routed to each loudspeaker. For example, to listen to channels 1 and 3 of
audio group 1, then set the bank selection to EX A, the left source selector to 1 and the
right source selector to 3.
The two lock indicators on the front panel below the right source selector are used to
display the channel active bits contained within the control packet of the embedded audio
data. If channels 1 or 2 are active then the left lock indicator is set on, if channels 3 or 4
are active then the right lock indicator is set on. For 3G/HD-SDI, control packets must be
transmitted, but with SD-SDI, control packets are optional. So in the case where no control
packet is found but audio data is available, then the unit assumes that all channels are
active on the currently selected group and both lock indicators are set on.