Specifications

'
Operation
13
2.
3.
4.
Operation
IMPORTANT
All
signal source equipment
should be adequately
earthed. This not only
ensures
your
safety
but
everybody else's
as well. Faults can and
do occur in
mains connected
equipment where the chassis
can
become
"live"
if it is not
properly
earthed. ln these
inslancesthe fault in a
"floating'(un-grounded) piece
of
equipment will look for the
shortest
path
to
ground
which could
possibly
be
your
amplifiefs input. lf the
fault current is large
enough it will deslroythe input to
your
amplifier and look for the next available
path,
which
may
be
you!
Before making any connections
to
your
amplifier
obserVethe following:
4.
1.
5.
Ensurethe mains voltage supply
matchesthe label
on the rear
panel
of
your
amplifier
(+/.
10olo).
Ensure that the
power
switch is OFF
(UP)
Ensure that all system
grounds
(earths)
are
connected from
a common
point.
Avoid
powering
equipment within a system from
multiple
power
sources
that may be separated by large
distances.
Checkthe continuity of all inlerconnecting
leadsto
your
amplifier, ensure that there are no
open
or
short circuited conduclors.
Ensure lhal the
power
handling
of
your
load
(speakers)
can adequately cope
with the
power
oulput of the amplifier.
Very lmportant
Dueto the high
powerabilily
ofthe AM3OOZ
you
need
lo be aware that certein
precautions
need to be
followed to ensure longevity of
youramplifier:
-
Nevertum
youramplifi
eron unless all connections
(inputs
and speakers) havebeen made!
-
Neverplug in a signal lead afferthe
amplifierhas
been turned on ! Tum the unit offfirst.
-
Never drive the output into clipping if the load is
open circuit or there is no speaker load connected!
PoweringUp
REMEMBER
The amplifi ershould bethe lastpieceof equipmentthat
you
tum on and the
@!
piece
of equipment that
you
turn off.
We recommend turning the altenuators on
your
amplifier
down when turning the unit on.
When
you power
up
your
amplifier,
your
amplifier
goesthrough
an
establishment
period
before itwill
acceptsignal. The lnrush
Cunent Suppression
(lCS)
circuit
is in operation for the first 0.5 seconds.
This
limitsthe mains cunent to
prevent
"nuisance tripping"
ofcircuit breakers.
Ouring this
period
the THERMAL LED will flash red
whilst the mains voltage
gradually
charges up the
power
supply. You will then hear dual relays
"click",
indicating mains is nov!, d ireclly applied tothe amplifier.
While the ICS circuit operates
there
is
also a
30dB
mute on the signalinput. Aftertwo secondsthis mute
will release, allowing
any applied sjgnal to
pass
unattenuated.
When s,witching the amplifier off, wait a couple of
seconds before switchinglhe uniton again. Thisallows
the ICS circuit to reset.
Level
Matching
The normaloperating
position
forthe attenuator
is
the "0 dB"
position
(fully
clockwise, no attenuation).
ln this
position
the
amplifier operates at full
gain.
Turning the attenuator back
(anticlockwise)
reduces
the input sensitivity by the amount marked
on the
attenuator scale
(dial).
NOTE: lf full
power
output is required
you
should
operate
your
amplifierwith the front
panel
attenualor
above the
-1
5dB
position,
otherwise clipping ofthe
input circuitry end its resultant
distorlion will
occur
before full output
power
is achieved.
Sensitivity
Youramplilieris a lineardevice operatingwith a fixed
input
to
output voltage
gain
(less
aitenuation). The
maximum output voltage swing isdetermined
by the
applied mains voltage, load, load type and the duty
cycle ofthe applied signal.
The voltage
gain
factor of
youramplifieris:
53.5times
or 36d8.
The input sensitivity for
your
amplifier when the
attenuator is at the
"0"
dB attenuation
position
(fully
clockwise) is nominally:
+3.3dBu
(1.1
4volts in) forrated
powerinto
a 8 ohm
load.
+2.2dBu
(1.00
volt in) for rated
powerintoa
4 ohm
load-
Australian Monitor
/tu