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23. ZONE LOOP OUT/IN
A send/return patch point for external effects or EQ. The loop out terminals are line level
preamp outputs following the master level stages of each zone. The Loop In terminals are
line level power amplifier input points for each zone power amp. Both the Loop Out and
Loop In are unbalanced signals requiring only a single conductor shielded cable for patching
to the external device. Wire the cables as follows:
Cable shield- ground
Cable conductor-out (or in)
SEE DRAWINGS page 11.
Note: Both cables share the same ground terminal. The Loop Out has a low source imped-
ance to drive any reasonable device, and the in Loop In is a relatively high impedance input
to not load down any reasonable device. It is recommended that all such external effects or
EQ devices be in the same rack as the PZS.
24. LINK SWITCH
When the link switch is in the ÒinÓ position, the mixer preamp signal is routed directly to the
zone power amps. When the link switch is in the ÒoutÓ position the signal is routed to the Loop
Out. This signal can then be sent to an external processor or power amp. If it is sent to an
external processor, it can be returned to the Loop In connection to be amplified by the internal
zone amplifier.
25. 600 OHM BALANCED OUTPUTS
A balanced output to drive additional power amplifiers. The PZS 140 has four 35 W RMS
power amplifiers built in. For small installations, this is an adequate power distribution system,
but for larger systems, external power amplifiers may be added to supply the extra power
required. In this case, the external power amplifiers can be driven from this 600 ohm
balanced line level output without causing unwanted ground loops or hum problems. A two-
conductor shielded cable should be wired as follows:
Cable shield- ground
Conductor 1- 600-ohm positive
Conductor 2- 600 ohm negative
In this case, conductor one should be wired to be the positive input feed for the external
power amp, and such amp connections can be wired either balanced or unbalanced.
SEE DRAWINGS page 12.
26. POWER AMP OUTPUTS
Outputs for speaker connections. Each power amplifier has a 4-ohm direct output, and a tran-
former isolated 8-ohm, 25- and 70-volt outputs.
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