User guide

8
I
n Phase
Balanced Line Using 1/4' Connector
Unbalanced Line Using 1/4" Connector
4.7 K
4
.7 K
S
ource A
Source B
Connecting to a Multi-Channel or
Stereo Source
I
n Phase
From Microphone
1
2
3
3 Pin Connector
Low Impedance Microphone
I
n Phase
3
Pin Connector
12
3
Balanced Line Using 3–Pin Connector
3
Pin Connector
1
2
3
Unbalanced Line Using
3–Pin Connector
FIG. 6: AUDIO SOURCE CONNECTORS
SELECTING AN AUDIO SOURCE APPROPRIATE FOR HEARING IMPAIRED LISTENERS
If the T35 is going to be used specifically for the accommodation of hearing impaired listeners, we rec-
ommend following these general guidelines:
The PPAT35 transmits audio with excellent fidelity. Therefore, the audio source signal should be of the
highest audio quality and not subject to a compressor, limiter, reverberation, or other signal processing
equipment. The T35 has an effective audio processor. If compression is desired in the audio, refer to
page 16-17 for features and controls. Excessive compression is not helpful to the hearing impaired and
can contribute to excessive noise in the receiver outputs.
The
T35 audio source signal is usually connected to a mixer
’
s “line output” signal which is behind the
mixer’s parametric equalizers but ahead of any equalization used for house loudspeakers.
If audio delay is available for use in large auditoriums, it’s usually best to use it. Because radio signals
travel faster than sound, delaying the transmitted audio so that an average listener (in the middle of the
listening area) hears the transmitted audio a few milliseconds after audio from the main sound reinforce
-
ment system speaker is helpful. This will also help audience members who lip read.
MULTI–CHANNEL SOURCES
By constructing a simple resistive mixer, stereo (or 3 channel) sources can be connected to the T35.
Additional channels can be accommodated by adding a resistor for each source. Necessary resistors can
be obtained from Williams Sound (Part Number RFC 472) or from any local electronics parts supplier.
See Figure 6.