Williams Sound T45 Manuel D’Utilisation
6
Personal PA
®
DSP FM Wideband Transmitter
BALANCED LINE USING 1/4" CONNECTOR
IN PHASE
A106
UNBALANCED LINE USING 1/4" CONNECTOR
A107
4.7 K
4.7 K
SOURCE A
SOURCE B
CONNECTING TO A MULTI-CHANNEL OR STEREO SOURCE
A109
BALANCED LINE USING 3–PIN CONNECTOR
IN PHASE
1
2
3
3 PIN CONNECTOR
A108
IN PHASE
FROM MICROPHONE
1
2
3
3 PIN CONNECTOR
LOW IMPEDANCE MICROPHONE
A104
UNBALANCED LINE USING 3–PIN CONNECTOR
1
2
3
3 PIN CONNECTOR
A105
Figure 3: Audio Source Connectors
Multi–Channel Sources
By constructing a simple resistive mixer, stereo (or 3 channel) sources can be connected to the T45. 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 3.
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 3.
Selecting an Audio source Appropriate for Hearing Impaired Listeners
If the T45 is going to be used specifically for the accommodation of hearing impaired listeners, we recommend following these
general guidelines:
general guidelines:
The PPA T45 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 T45 has a very effective DSP audio
processor. If compression is desired in the audio, refer to page 17-18 for features and controls. Excessive compression is not
helpful to the hearing impaired and can contribute to excessive noise in the receiver outputs.
not subject to a compressor, limiter, reverberation, or other signal processing equipment. The T45 has a very effective DSP audio
processor. If compression is desired in the audio, refer to page 17-18 for features and controls. Excessive compression is not
helpful to the hearing impaired and can contribute to excessive noise in the receiver outputs.
The T45 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.
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 reinforcement system speaker is helpful. This will also help audience members who
lip read.
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 reinforcement system speaker is helpful. This will also help audience members who
lip read.