QUAD 33 - CONNECTIONS; Control Unit to Power Amplifier; Power Amplifier to Loudspeakers

CONNECTIONS
Din
styls
plugs
showing method of
assembly.
See individual illustrations
for
Din connections.
Control Unit
to Power Amplifier
Two leads are
supplied
with
the control unit. That
with
a
4-pin
connector at each end is reversible and
connects the control unit
output
to the
power
amplifier
input. The
other connects
the
switched
mains
supply
from
the control unit to the
power
amplifier and
the
2-pin
plug
at the control unit
end
of
this lead is
reversible.
(See
Fig. l0). Longer
leads
are
permissible
where required for
special
installations
(see
Specification
on
page
2l).
Pape Six
Power
Amplifier
to Loudspeakers
Ordinary lighting
flex
or similar
cable may
be
used
for
connecting
the loudspeakers
to
the
power
amplifier
unless
a very long run
is involved
in which
case
a
heavier
calibre
cable should
be used.
As
a
rough
guide
the DC
resistance
of the
cable
should not
exceed
about 5,%
of
the nominal impedance
of the loudspeaker.
Each
loud-
speaker
should be
connected to
its appropriate
llower
amplifier
output
so that the
two
pairs
of
wires
are
con-
nected in
the
same way,
to
ensure that
the
speakers
operate in
phase.
For
example,
if the top
output
socket
on one
channel is
connected
to the left-hand
terminal
of its
speaker, the top
output
socket on
the
other
channel should
also be
connected
to
the
left-hand
terminal
of
its
speaker.
This
is
quite
straighfforward
but
should there
be any
doubt the
phasing
can be
checked
later
experimentally.
(See
Page
l5). Where
one loudspeaker
only is
used for
mono,
phase
is not
important
and in
this
case
either outlet may
be used
and the
sockets of the
other channel left
vacant.
In
cases
where loudspeakers,
such as the
electrostatic
loudspeaker, also require
an
eneryising
supply,
the
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