1.
There are two
INPUT CONNECTORS
per channel. One is a combination 3
pin XLR and 3 pole (TRS) ¼" jack socket, the other a male XLR for linking to
other amplifiers. Both balanced and unbalanced signals can be used to drive
the
amplifier.
XLR connector wiring
Balanced
Operation
Unbalanced
operation
PIN 1 Ground
PIN 1 Ground
PIN 2 +Ve/in-phase signal
PIN 2 +Ve/in-phase signal
PIN 3 -Ve/out-phase signal
PIN 3 Link to ground (pin1)
Jack connector wiring
Balanced
Operation
Unbalanced
operation
3 pole/TRS/stereo ¼ " jack
2 pole/TS/mono ¼ " jack
TIP +Ve/in-phase signal
TIP +Ve/in-phase signal
RING -Ve/out-phase signal
SLEEVE Ground
SLEEVE Ground
2. Input
GND LIFT
(ground lift) switch removes the ground connection to all input
connectors. This can solve hum loop problems when connecting equipment
with
different
A.C.
supplies.
Under no circumstances should the electrical safety ground (earth) from the
A.C. supply be disconnected.
3.
PARALLEL INPUTS
links Channel A input to Channel B. A single input signal
will now supply both channels. The volume levels of each channel can still be
adjusted
individually.
4.
35Hz high pass filter
reduces the level of very low frequency signals
reaching the speakers, improving bass clarity and power handling. It is
recommended that this filter is always used for live P.A/Sound re-inforcement.
Ported / Vented / 'bass reflex' speaker cabinets can be damaged if driven with
high power low frequency. For Studio monitoring where a totally flat response
is required, deselect the High Pass Filter. The filter has an 18dB / octave cut-
off
slope.
Rear panel controls and features
STUDIOMASTER AX Amplifier Series
STUDIOMASTER AX Amplifier Series
3
1
2
3
4
230V
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION
A
IR
V
E
N
T
S
F
R
O
N
T
A
N
D
R
E
A
R
M
U
S
T
N
O
T
B
E
O
B
S
T
R
U
C
T
E
D
C
A
U
T
IO
N
CIRCUIT
BREAKER
GND
LIFT
PARALLEL
INPUTS
INPUT B
LINK
B
CH
BRIDGE
CH. A
PIN 1+ =
PIN 2+ =
+
-
PIN 1+ =
PIN 1- =
+
-
ASSEMBLED IN CHINA
35Hz
LIMITER
OFF
HI
LO
INPUT A
LINK
A
CH
HI
LO
35Hz
LIMITER
OFF
HI
LO
XOVER
TO CH A - AMP
XOVER OUTPUT
OFF
ON
HI
LO
XOVER
TO CH B - AMP
OFF
ON
PIN 1+ =
PIN 1- =
+
-
XOVER OUTPUT
100Hz
150Hz
