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User’s Guide
6200 Digital
Voice Processor
To download the latest version of 6200 Designer, a Windows GUI
application interface for the 6200, go to: www.airtoolsaudio.com
SETTING MIC PREAMP GAIN:
To set the coarse preamp gain:
1. Press the HOME button to ensure that we are starting from the top.
2. Press the NEXT button once.
3. Turn the ADJUST knob clockwise until the display reads “Section to Edit, - Setup Menu -”.
4. Press the NEXT button once.
5. Turn the ADJUST knob clockwise until the display reads “- Setup Menu -, -- Channel 1 Input --”.
6. Press the NEXT button once and the display should read “Channel 1 Gain, Hot Mic -36 dBu”, if it does not turn the ADJUST
knob clockwise or counter-clockwise until it does. This provides 40 dB of gain which assumes a nominal input level of -36
dBu. This setting should be sufficient for most microphones however, certain dynamic microphones may require more.
7. Press the HOME button when finished.
Provided that your monitoring path is turned on and set up properly, you should now be able to speak into the microphone and
get a basic signal through the 6200. Talk into the microphone as loudly as you think you will ever talk into it. If the audio distorts,
you may need to turn the gain down (try the -10 dBV setting). If the audio level is too weak, turn the gain up (try the -56 dBu
setting). If you adjust the gain, repeat the process of speaking loudly into the mic and checking for distortion or weak level.
We’re looking for a ballpark level adjustment here. When you find the most suitable coarse gain adjustment, move on to the fine
gain adjustment.
To set the fine preamp gain (for Channel 1):
1. Press the HOME button to ensure that we are starting from the top.
2. Press the NEXT button once, the display should read “Section to Edit, - Channel 1 Menu -“.
3. Press the NEXT button once, the display should read “- Channel 1 Menu -, -- Input --“.
4. Press the NEXT button once, the display should read “Input Gain Trim, 0.0 dB“.
You can now use the ADJUST knob to dial in your fine gain setting. Talk into the microphone as loudly as you think you will ever
talk into it while turning the ADJUST knob clockwise (increasing gain). Note when the audio distorts and then turn the gain back
down somewhat (maybe 6 dB or so). You should now be able to talk in a normal voice with adequate level while still having
enough headroom for loud passages. If you find that the audio never distorts when turning the gain up, and you reach the
maximum gain of 31.5 dB provided here, you should return this gain setting to 0.0 dB and then go back to reset the coarse gain
to a higher setting.
INPUT METERING:
You can monitor the input meters by viewing the “In LVL” menu accessed by pressing the HOME button once then turning the
ADJUST knob clockwise once. A meter for channel 1 is displayed on the top line, channel 2 on the bottom line. Unity gain is
represented as an “open square” symbol and corresponds to an input level of -20 dBFS = +4 dBu = 0 VU.
MOVING ON:
Now that we have a basic signal through the unit, we can move on to exploring the specific signal processing functions of the
6200 (EQ, Dynamics, etc.).
DSP Modules
The following are the available DSP modules available in the 6200. Each of these modules may be individually enabled or
disabled. The order of the modules is fully configurable. The modules are listed in their default order.
SYMMETRY:
For broadcast applications, a switchable voice symmetry circuit helps make speech waveforms more symmetrical, which makes
better use of the transmitter’s output power.
Human speech, particularly male human speech, contains a great deal of asymmetry. In broadcast (especially AM broadcast),
this wastes transmitter power because asymmetrical waveforms do not utilize the full power of the modulator.
Controls:
Bypassed/Enabled - When bypassed, the input is sent unmodified to the output. When enabled, the module processes the signal.
Basic Setup... continued, DSP Modules
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