8
Reference Monitor Meters User Handbook
1
REAR P
ANEL C
ONNEC
TIONS & OPER
A
TION
REAR PANEL CONNECTIONS & OPERATION
Rear Panel Connections & Operation
Fig 1-10: RM-M2-53 Rear Panel
Mains Power
Power is applied via a standard three-pin IEC male socket. Mains voltages between 85V and
264V AC at frequencies between 47 and 63Hz are accepted without adjustment. A 1A, 5 x
20mm SB fuse is used. The Earth pin MUST be connected to ensure safety.
Audio Inputs
Three-pin female XLR connectors are provided for the connection of up to two stereo audio
sources (dependent on model). The pin assignations are as follows:
Pin 1:
Ground
Pin 2:
In-phase signal (“hot”)
Pin 3:
Out-of-phase signal (“cold”)
Unbalanced signals may also be used by linking pins 1 and 3 and applying the unbalanced
signal to pin 2. Each of the audio inputs accepts either a pair of analogue line-level signals
(using both input XLRs) or a single AES/EBU digital signal (attach to the left-hand XLR of
the pair and leave the right-hand XLR unconnected). The unit automatically detects digital
audio signals and re-configures the input accordingly. A full-scale digital input signal
(0dBFS) corresponds to the maximum analogue input signal level as shown in Table 1 (with
no extra input gain applied).
Digital Input Termination
Switchable termination is provided to allow the Reference Monitor Meters inputs to be
bridged across an existing AES/EBU connection without double-termination, but this should
only be attempted with the terminating equipment mounted adjacent to the Reference
Monitor unit and with connections kept as short as possible. It is strongly recommended
that the digital input termination is set to ON at all times. Failure to do so may result in
unreliable reception of digital input signals and/or crosstalk between sources.
The 110Ω input termination for the AES/EBU digital inputs is controlled by the settings of
DIPSwitches 1 and 2 in the “Settings 1” bank (found on the rear panel of the unit) as follows:
SW1: When set to ON, digital input 1 is terminated with 110Ω.
SW2: When set to ON, digital input 2 is terminated with 110Ω (valid on 2 channel units only)
