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OPERATION NOTE: 48 volt phantom power is always available on the + and - pins with
reference to ground.
19. CHANNEL 1 and 2 HI-Z INPUT
Normal high-Z line input for cables without connectors. This high-Z input can be used for
normal high impedance unbalanced microphones or other line level feeds. For a balanced
application, two conductor shielded cables should be wired as follows:
Cable shield- ground
Conductor 1- Hi-Z positive
Conductor 2- Hi-Z negative.
Notice the ground terminal is shared by the low-Z input as well. Normally, conductor 1 should
be the positive output feed from the associated equipment. For unbalanced applications such
as microphones with single conductor shielded cables and other such single ended equip-
ment feeds, jumper the Hi-Z negative input to ground, and wire the cable as follows:
Cable shield Ñ ground
Conductor Ñ Hi-Z positive.
20. CHANNEL 3 THRU 5 RCA INPUTS
Normal high-Z line inputs for use with cables fitted with RCA male connectors. These inputs
are designed to accept normal line level unbalanced signals such as those from a tuner or
any other suitable background music source. The dual RCA inputs are mixed together inter-
nally to create a mono signal from a stereo feed. If only a mono signal is supplied, then either
RCA jack can be used. To create the correct gain structure for the RCA jacks, a new PZS 140
unit has jumpers from the Hi-Z negative input to ground on channels 3-5. If your unit does not
have such jumpers in place, and you intend to use the RCA jacks as inputs, it is suggested
that you add the jumper to that particular channel.
21. CHANNEL 3 THRU 5 HI-Z INPUTS
Normal high-Z line input for cables without connectors. This high-Z input can be used for any
line level signal feed, balanced or unbalanced. A new unit has jumpers from the Hi-Z negative
input to ground on channels 3- 5. For unbalanced applications such as music sources with
single conductor shielded cables, the jumper should be left in place or added. Wire the cable
as follows:
Cable shield Ñ ground
Cable conductor Ñ Hi-Z positive.
For balanced signal feeds such as a transformer balanced telephone music feed, the ground
jumper should be removed and the two conductor shielded cable should be wired as follows:
Cable shield- ground
Conductor 1- Hi Ñ Z positive
Conductor 2- Hi Ñ Z negative.
22. CHANNEL 3 THRU 5 LOW-Z INPUTS
Normal low-Z mic inputs for additional paging microphones as applications warrant. The
PZS 140 was primarily designed for two paging microphones and three music sources. If
desired, channels 3- 5 can be used for additional mic inputs, although these channels will
not duck the music levels as channels 1 and 2 do.
OPERATION NOTE: 48 volt phantom power is always available on the + and - pins with
reference to ground.
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