DR-4000 Series Owner’s Manual
18
CAUTION AND
TROUBLESHOOTING
Feedback
Take care in selecting PA volume, transmitter location,
and speaker placement so that acoustic feedback
(howling and screeching) is avoided. Please also note
the pickup pattern characteristics of the microphone
selected. Unidirectional mics are more resistant to
feedback. However, they are better at picking up sound
sources that are directly in front of the mic. Also, mics that
are farther from a sound source require more acoustic
gain, and thus are more prone to feedback than close-
source mics (i.e. handheld).
The following examples demonstrate proper and
improper microphone placement:
1. Good Mic Placement. The microphone is not in
the direct path of the loudspeaker, and the stage
monitor is pointed at the null point of the cardioid
microphone pattern.
2. Poor Mic Placement. The microphone is positioned
in front of the loudspeaker, and prone to feedback.
3. Poor Mic Placement. The microphone is pointed
directly at the monitor speaker, and prone
to feedback.
No or Low Audio
If you are not getting audio through the system, carefully
check all setups.
• Note that the receiver and transmitter must be set to
operate on the same RF CHANNEL.
• For DR-T45 Body Pack transmitters, confirm that
the POWER OFF/MUTE/ON switch is not in the
MUTE position.
• If using the UNBALANCED LINE LEVEL OUT of the
receiver, make sure the Volume setting in the Receiver
LCD panel is set high enough.
1.
✔
2.
✖
3.
✖
8868 Digital Ref 4600 Manual.indd 18
10/27/09 10:37:18 AM
