Power-Up
Make sure any local power supplies are plugged in, then turn on the power switches
of any phantom power supplies (PS2000L, SPS2000A etc.).
☞
If you are using a large number of locally powered intercom stations, you should
activate their local power supplies before activating any phantom power supply.
Otherwise, you may get an overload indication on the phantom supply. In this
case, either reset the phantom supply, or momentarily turn it off, then on.
Sidetone Adjustment
The SS1000 and SS2000 use full-duplex audio (the same as conventional telephone
lines) in which the talk and listen audio are sent and received on the same wires. Thus,
when you talk, you also here your own voice back as with a telephone. If you are using
the built-in speaker for listening and a panel microphone or handheld microphone for
talkback, you could experience unwanted feedback, since the microphone may pick up
your returned voice audio from the speaker and re-amplify it. This could also happen if
you are using a headset or headphones with open-ear style earmuffs. On the other hand,
if you are using earmuffs that completely enclose the ears, the microphone is not likely
to pick up the returned audio. And, a certain amount of your own voice level is desir-
able to overcome the muffled sensation when talking. The sidetone adjustment is dif-
ferent for these different operating conditions:
If you are using the speaker with a panel microphone, or if you are using an
open-ear style headset or headphones, adjust sidetone as follows:
1.
SS2000 only: activate channel 1 as described in the operating instructions, page
22
.
2.
Activate talk and listen as described in the operating instructions.
3.
Slowly increase the volume to maximum while talking into the microphone.
4.
Using a small flat-bladed screwdriver, adjust the channel 1 sidetone trimmer (Fig-
ure
2
, page
6
, item 12) to minimize your voice level in the headphones.
2 0
Au d i o c o m ®
