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Studio Reference
IIIII
&
II
II
II
II
II
Professional Studio Amplifiers
I. Reset Switch
This back panel switch can be used to trip and reset the
AC mains circuit breaker (see Section 4.3.4).
J. Power Cord
For 120 VAC, 60 Hz North American units, the
Studio
Reference
I
includes a 10 AWG power cord and NEMA
TT30P plug, and the
Studio Reference
II
includes a
12 AWG cord and NEMA 5-15P plug. Other units are
shipped with an appropriate power cord and plug.
K.
P.I.P. Module
The standard P.I.P.-FX input module is provided with
your amplifier. It provides female XLR input connectors.
Each pair of XLR and phone jack connectors is wired in
parallel so the unused connector can be used as a
“daisy chain” output to connect a source to multiple am-
plifiers. Other
P.I.P.
modules can be used in place of the
P.I.P.-FX to provide additional features that customize
your amplifier for different applications (see Section 8 for
available
P.I.P.
modules).
L. Balanced XLR Inputs
A balanced three-pin female XLR connector is provided
on the P.I.P.-FX (K) for input to each channel.
Caution:
Do not use the channel 2 input in either mono mode.
M. Output Connectors
Two pairs of versatile 5-way binding posts are provided
for the output of each channel so multiple loudspeakers
can be connected easily. They accept banana plugs,
spade lugs or bare wire.
N. Stereo / Mono Switch
This switch is used to select one of three operating
modes. Stereo mode is used for normal two-channel
operation, Bridge-Mono mode is used to drive a single
channel with a load impedance of at least 4 ohms, and
Parallel-Mono mode is used to drive a single channel
with a load impedance of less than 4 ohms.
WARNING:
Turn off the amplifier before changing this switch
(see Section 3.3).
O. Balanced Phone Jack Inputs
A balanced
1
¦
4
-inch phone jack is provided for input to
each channel. They may be used with either balanced
(tip, ring and sleeve) or unbalanced (tip and sleeve) in-
put wiring (see Section 3.3). These inputs are in parallel
with the
P.I.P.
connector, so they should not be used as
inputs if the installed
P.I.P.
has active circuitry.
Caution:
Do not use the channel 2 input in either mono mode.
P. Ground Lift Switch
The input signal ground may be isolated from the AC
ground with this switch to help prevent unwanted
ground loops. It affects only the phone jacks (O). It has
no affect on the
P.I.P.
module’s XLR connectors. Activat-
ing the switch inserts an impedance between the sleeve
of each phone input jack and the circuit ground.
❑
Input Sensitivity Switch
The three-position input sensitivity switch inside the am-
plifier can be accessed by removing the
P.I.P.
module.
Settings include 0.775 volts and 1.4 volts for rated out-
put, and 26 dB voltage gain (see Section 4.4).
Fig. 2.2 Rear Facilities