Lectrosonics HM - Manual (Page 10)

HM
LECTROSONICS, INC. 10
Audio Screen
The Audio Screen is used to ad-
just input gain and low frequency
roll-off, and to turn phantom
power on and off. Repeatedly
pressing the AUDIO button se-
lects the setting. Press and hold
the AUDIO button and use the
UP and DOWN arrows to adjust
the value.
Adjusting the Input Gain
The control panel Modulation LEDs indicate the modu-
lation level and limiter activity. This gain adjustment
matches the transmitter gain with the microphone’s
output level, the user’s voice level and the position of
the microphone. Once set, the transmitter’s audio level
setting should not be used to control the volume of
your sound system or recorder levels. The audio input
level can be set with the unit in Standby Mode or while
powered up in normal operation.
Signal Level -20 LED -10 LED
Less than -20 dB Off Off
-20 dB to -10 dB Green Off
-10 dB to +0 dB Green Green
+0 dB to +10 dB Red Green
Greater than +10 dB Red Red
Note: Different voices will usually require
different settings of the AUDIO control, so check
this adjustment as each new person uses the
system. If several different people will be using
the transmitter and there is not time to make the
adjustment for each individual, adjust it for the
loudest voice.
1) With the HM powered off, insert the microphone
plug into the XLR Input Jack, aligning the pins and
ensuring that the connector locks.
2) Place the transmitter in Standby Mode, or if the unit
is to be powered up and adjusted, mute the main
sound system prior to powering up the transmitter.
3) Position the microphone in the location where it will
be used in actual operation.
4) Observe the audio level LEDs while speaking or
singing into the microphone at the same voice
level that will be used during use. While holding the
AUDIO button, press the UP or DOWN arrows until
the both the -20 and -10 LEDs glow green, with the
-20 LED flickering red on louder peaks. This will
optimize the signal to noise ratio of the system with
full modulation and adequate headroom to prevent
overload and audible compression of signal peaks.
Note: Setting the audio level too high reduces
the dynamic range of the audio signal. Setting the
audio level too low may cause hiss and noise in
the audio.
5) If the unit was set up in Standby Mode, it will be
necessary to turn the transmitter off, then power it
up again in normal operation so the RF output will
be on. Then the other components in the sound or
recording system can be adjusted.
Adjusting the Low Frequency Roll-off
Repeatedly press the AUDIO button until the LF roll-
off adjustment screen appears. Then press and hold
the AUDIO button while selecting the desired roll-off
frequency with the UP and DOWN arrows.
The roll-off frequency can be set to 35, 50 or 70 Hz.
Selecting the Phantom Power Supply
With the HM transmitter powered on and in the RF on
or RF off mode, press and hold the audio button and
observe the LCD. Release the button and press and
hold it again. Repeat this process until the display indi-
cates the “Phantom Mode”.
Once you get to the PH setting, keep the AUDIO button
pressed, then use the UP and DOWN arrow keys to
cycle through the settings (off, 5, 15, 48) until you get
the desired setting.
When you release the AUDIO button and your Phantom
Power is now set.