BSS Audio
MSR-604ii User Manual version v1.4
Page 15
connected to its own output section. The default jumper positions are identified on
the PCB by a white block printed adjacent to the relevant jumper pins.
The signal labelled EXBUS-OUT passes via the LOOP OUT connector to the
EXBUS-IN terminal in the LOOP IN connector on the adjacent unit, allowing a
D.A. channel to span more than one MSR-604ii unit. It will be apparent from the
above example that the permutations of D.A. blocks that can be configured within
a system is limited only by the number of MSR-604iis that are connected in the
rack.
The limiting factor on how many channels may be linked is the parallel loading
that occurs on the drive from the input stage. The recommended maximum is
sixteen, which equates to sixty four outputs. This will result in an overall drop in
system gain of about 0.7dB but should not significantly affect noise or distortion.
It is strongly advised that in order to have a configuration work first time, that the
required system is first planned out on paper. Implementing the system then
becomes a simple mechanical task of setting the relevant jumpers.
Controls
When a group of channels is linked as a D.A., the controls associated with the
chosen input section are used to set the required operating conditions. the controls
on the other channels are disabled, except for the CLIP LEDs and the LISTEN
switches which may be used to confirm that the signal is reaching all the linked
output stages.
7 Compatibility with Pre-MkII systems
Limited compatibility exists between early MSR-604 systems and MSR604ii units
using adaptor leads to interconnect the power cables.
Please order adaptor leads as MSR-604 Mk I adapter kit Z-MSRIIADK-01. This pair
of cables is required for any of the system combinations described below. Only
one adapter set is required per system no matter how many new units are to be to
be installed.
7
.1 Installing an MSR-604ii in a MkI system
The MSR-604ii may be used to extend an existing rack which uses earlier versions
of MSR-600 components. Although the MkII units will perform better than the
originals, some of the enhanced performance and features will be lost. In general
the dynamic range will be reduced by about 2dB and the LISTEN monitoring
function will not be available. Also channel bus linking will be restricted to
operating within individual MSR-604ii units.
Setting system jumpers
Refer to section 9.4; Setting system jumpers
for information on this procedure.
