LightSpeed Technologies CAT 860 - Manual (Page 14)

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1. Overview
2. Setup & Use
3. Optional Accessories
4. T
roubleshooting
5. W
arranty
, Safety
& Specifications
1. Overview
2. Setup & Use
3. Optional Accessories
4. T
roubleshooting
5. W
arranty
, Safety
& Specifications
10. OUTPUT TO PERSONAL ASSISTIVE
LISTENING DEVICE (ALD)
1. Turn the ALD (Assistive Listening
Device) volume control on the
back panel all the way down (fully
counterclockwise).
2. Determine the size and type of
audio input jack on the device as
many manufacturers’ products
differ in connector size and shape.
The Lightspeed LES-370 Personal
FM System requires a 3.5 mm to
3.5 mm patch cable (part# CA-
MMC3535, not included).
3. Connect a patch cable from the
ALD’s microphone jack or AUX
input to one of the following
3.5mm audio jack on the CAT 860:
• “ALD OUT” on the front panel
• “AUX OUT” on the back panel
4. Adjust the volume control on
the ALD’s receiver to maximum
output. NOTE! This is to set the
maximum allowable signal from
the CAT 860.
5. With the CAT 860 and ALD turned
on, speak into the REDMIKE and
slowly adjust the corresponding
volume control on the CAT 860
until the appropriate audio level is
obtained in the ALD.
RS-232 IN
Front Panel RS-232
Control Select 1 2 + + - -
RS-232 IN
Front Panel RS-232
Control Select 1 2 + + - -
9. AUDIO EQUALIZATION OF THE CAT 860
• The voice should be natural,
very clear and without any audio
feedback (ringing)
• Walk the room listening for the
overall quality and any feedback
that is present
• If there is a lot of audio feedback,
it is likely the volume is too high.
Ensure the volume is at the
appropriate level, a second person
is helpful to determine this.
• If feedback is still present with the
audio set at the right level, make
the following EQ adjustments:
– High pitched ring: lower the 2K
and/or 4K adjustment by _ turn
– Lower pitched ring: lower the
500 and/or 1K adjustment by _
turn
• If you notice the sound is “muddy”
or has too much bass:
– Lower the 500 adjustment by _
turn and/or
– Raise the 2K or 4K adjustment by
1/8 turn
• Note: the EQ adjustments should
be preset at “12:00.” This is the
nominal level and any adjustments
(up or down) should be made from
this level.
The CAT 860 uses a 4-band audio equalizer designed to optimize and fine-tune
the microphone sound quality for the classroom. Below are some tips on proper
system equalization: