Macro-Tech 3600VZ Power Amplifier
Page 15
Reference Manual
3.3.4 Input Connection
Both the balanced XLR and phone jack inputs have a
nominal impedance of 20 k ohms (10 K ohms with un-
balanced wiring) and will accept the line-level output of
most devices. Female XLR input connectors are pro-
vided on the standard P.I.P.-FX input module (other
PIP
modules are described in Section 8.1). Correct input
wiring will depend on two factors: (1) whether the input
signals are balanced or unbalanced, and (2) whether
the signal source floats or has a ground reference. Fig-
ures 3.7 and 3.8 show the recommended connection
techniques for each type of signal source.
The amplifier’s built-in ¼-inch phone jack input connec-
tors can be wired similarly for balanced or unbalanced,
floating or ground-referenced sources. They have a
standard tip-ring-sleeve (TRS) configuration: the tip is
Fig. 3.8 Balanced Input Wiring
Fig. 3.7 Unbalanced Input Wiring
Fig. 3.9 Balanced and Unbalanced Phone Plugs
positive (+), the ring is negative (–) and the sleeve is
ground (see Figure 3.9). Wiring for various sources fol-
lows the XLR wiring guidelines shown in Figures 3.7
and 3.8.
The phone jacks should not be used as inputs when a
PIP module with active circuitry is installed. The phone
jacks are in parallel with the output of the
PIP module,
so an input signal connected to the phone jacks can
feed backwards into the active circuitry of the
PIP and
cause undesirable distortion. You can use the phone
jacks for signal input with any of the following
PIP mod-
ules installed: P.I.P.-FX, P.I.P.-BB, P.I.P.-FMX, P.I.P.-FXQ
and P.I.P.-FPX. All other
PIP modules have active cir-
cuitry and should not be installed if you plan to connect
input signals to the phone jacks. The phone jacks can
always be used as “daisy chain” outputs to feed post-
processed signals from the
PIP to the inputs of other
amplifiers.
Please follow the instruction in Section 3.3.2 and 3.3.3 if
the amplifier will be used in either Bridge-Mono or Par-
allel-Mono mode. Remember, do not use the Channel 2
input in either mono mode.
