The system range is decreased when
power is reduced, but usually still covers
the entire seating area.
Step 7: Use a receiver to test the system and set
the input level control.
Audio Processor Options
The audio processor in the T20 is capable of four
modes of operation. The effects of these modes are
charted in figure 5.
Compressor Mode
Compressor mode is used for hearing assistance to
limit the dynamic range of the audio signals.
Hearing impaired people generally have a reduced
tolerance for wide dynamic range. The T20 is
shipped in Compressor Mode.
Noise Reduction Mode
The T20 can also be configured for for 2:1
compression. This is for use only with a receiver that
has a 2:1 expansion circuit for noise reduction.
Noise reduction is typically used in narrow-band
operation for high quality audio.
Soft Limit Mode
The T20 can also operate in a soft limit mode, which
allows full dynamic range of audio signals. This
mode may be preferred for musical programs, but
may provide too much dynamic range for hearing
impaired listeners.
Hard Limit Mode
Hard Limit Mode is useful if the T20 has been
installed with external signal processing.
For assistance in selecting an alternate audio
processing mode, contact Williams Sound technical
assistance at 1-800-328-6190.
Receiver Instructions:
Receiver Models R7, R7-4, R7-6, R16
Receiver Model PPA R7 has a single, wheel-type
volume control and an earphone output jack.
Step 1: To install the batteries, open the battery
compartment using a coin in the slot in the
bottom of the receiver. Press the batteries
into place, observing proper battery
polarity.
Step 2: Plug the earphone or headphone into the
earphone jack.
Step 3: Turn the receiver on by rotating the
volume control in the direction of the
arrow on top of the case. Turning the
knob in the direction of the arrow will
increase the volume. Turning the knob
against the arrow will decrease the
volume. To avoid draining the battery,
make sure the receiver is turned off when
not in use.
Step 4: If you are using the T20 with an existing
sound system, make sure the sound system
is turned on. Have someone speak into a
microphone while you listen with the
receiver and earphone. You should be able
to hear their voice through the receiver.
If you are using the T20 with a
microphone, have someone speak into the
microphone while you listen with the
receiver and earphone. You should be able
to hear their voice through the receiver.
Step 5: The T20 Transmitter has a screwdriver-
adjusted input level control located on the
front panel to compensate for different
input signal levels. Adjust the control so
the “OK” audio light flashes with the
signal. It’s alright if the “HI” light comes
on occasionally. Reduce the signal level by
turning the control counter-clockwise if
the “HI” light is on all the time.
If the “OK” light does not come on at all,
turn the T20 input level control clockwise
to increase the signal. If the input level
control is fully clockwise and the “OK”
