TAPE
RECORDING
Recording
Monitoring
CONNECTING OTHER
77
UNITS
TO THE 77 BUS
AMPLIFIER PROTECTION
LOUDSPEAKER PROTECTION
QUAD
ELECTROSTATIC
LOUDSPEAKERS
Select the source to be
recorded
(source
1 orsqrce 2) wtrich
will
be
heard
through the loudspeakers as well as
befrtg bd lo fte tape out sockets.
Recording will commence as soon as
the rc@der
b
started.
Monitoring is
achieved
by
pressing
tape, and the
@
LED ul
be also
be lit. To return to
listening to the source direct,
press
tape ag:iL
the tape
LED will
go
out.
Off
tape monitoring is automatically
prw*bd
lronr
any
input, when tape
is
selected,
via
a
recorder connected
to the
bpe sockets.
When connected as
part
of the 77
QUADUNK
syEtem
all units are
linked
together
via the
QUADLINK
data bus
which trardles
pofler,
signal and
control
functions.
Each
unit
incorporates a
QUADLINK
data h.rs
connecting
socket
and
is
supplied
with a special
cable for linking the
uSls bgdrcr
-
daisy chained.
Only
the correct
interconnecting cables bearing
the
QUADLINK
should be
used
-
a
range of different
lengths
are available.
Do not
ptrt
sttarp
bends
in the
QUADLINK
cable.
The
77
amplifier
is fully
protected
against
gross
overload and short-circuited
outputs and will automatically shut down if it is
overloaded
or
gets
too
hot
-
this
is indicated by the standby button LED flashing
(red
for overload and orange
for overheating) and
the
output being muted. For overload conditions
this is for
about 30
seconds, after this time it will
resume normal operation
but if the
overload
persists
then the
process
will
be
repeated
-
in
this
case the amplifier
should be switched off and the cause
of
the
problem
investigated. When
overheated, the shutdown
can
befrom about
5 seconds, oran
indefinate
period,
depending on the degree of overheating
and the time it takes
for it to cool down.
lf the
amplifier
is
played
at
very
high volume
levels for extended
periods
make
sure that it has adequate
ventilation.
The loudspeaker manufacturer will
usually state a maximum
recommended
amplifier
power
output,
but as the maximum
safe
power
for
most loudspeakers
is
time and
frequency dependent it
is ditficult to define
precisely
for a musical
signal. Some
manufacturers will
permit
their loudspeakers
to be used with
amplifiers
exceeding the
quoted
handling
provided
cefiain
precautions
are
observed. This can sometimes be an
advantage
in
enabling
shoft duration
peaks
to be
handled without
overload. The advice of
the loudspeaker
manufacturer
should always
be
obtained
if in
any doubt.
The77 integrated amplifier
is fullycompatible
with the
Quad
ESL63 electrostatic
loudspeaker.
lt
can
be used with the
earlier model
ESL
provided
the ESL
protection
circuit
(type
QELCLPK)
is fitted inside
each
loudspeaker-
withoutthis
protection
circuit they could be damaged by signal
peaks
-
please
contact
Quad
Electroacoustics
Ltd for full details.
page
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