Macro-Tech
®
602/1202/2402 Power Amplifiers
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 three-pin XLR input connectors
and
1
/4-inch jacks are provided on the standard
PIP2-FXQ input module (other PIP modules are de-
scribed in Section 8.1). Correct input wiring will depend
on two factors: (1) whether the input signals are bal-
anced or unbalanced, and (2) whether the signal source
Fig. 3.7 Unbalanced Input Wiring
Fig. 3.9 Balanced and Unbalanced Phone Plugs
Fig. 3.8 Balanced Input Wiring
floats or has a ground reference. Figures 3.7 and 3.8
show the recommended connection techniques for
each type of signal source.
The amplifier’s built-in
1
/4-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
positive (+), the ring is negative (–) and the sleeve is
chassis (see Figure 3.9). Wiring for various sources fol-
lows the XLR wiring guidelines shown in Figures 3.7
and 3.8.
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