BSS Audio MSR-602/604II Owner's Manual - Manual (Page 27)

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Limited compatibility exists between early MSR-604 systems and
MSR604 II units using adaptor leads to interconnect the power cables.
Please order adaptor leads as MSR-604 Mk I adaptor kit Z-MSRIIADK-
01. This pair of cables is required for any of the system combinations
described below. Only one adaptor set is required per system no
matter how many new units are to be to be installed.
The MSR-604 II may be used to extend an existing rack which uses
earlier versions of MSR-600 components. Although the Mk II 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-604 II units.
Remove the top cover plates on MSR-604 IIs and locate the two
jumpers JP14 and JP15 next to the aluminium regulator heatsink.
These jumpers will be shipped set to the factory default position,
indicated by a solid bar printed on the PCB. Move the jumper blocks
away from the default to cover the left and centre pins. It will be
noted that yellow LEDs LD9 and LD10 do not now illuminate when
power is applied. Replace the cover plate before installing in the
rack.
The new units should be mounted at the top of the rack, away from
the MSR-602 power supply. If more than one MSR-604 II is being
installed, the LOOP IN/LOOP OUT connectors are ‘daisy’ chained’
5.0 Compatibility With Pre MkII Systems
Compatibility With Pre MkII Systems
Installing MSR-604 IIs in a Mk 1 System
5.1 Installing
MSR-604 IIs in a Mk I
System
SETTING SYSTEM
JUMPERS
RACK INSTALLATION