Lectrosonics HM User Manual download pdf (Page 10)

LECTROSONICS, INC.

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.

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Lectrosonics HM User Manual Page 10

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