User`s manual

3.4 Input or Output Highpass Filter

The Highpass Filter controls are shown in Figure 3-3. The 200 Hz Highpass Filter is used to remove

any low frequency noises that may need to be removed before processing (“Input HPF”) or after

processing (“Output HPF”). Selecting “No HPF” will disable this feature. This filter is separate from the

Highpass Filter described in Appendix A, and has no adjustable parameters.

Figure 3-3 Highpass Filter

3.5 Output Lowpass Filter

The output Lowpass Filter controls are shown in Figure 3-4. This adjustable filter is used to remove high

frequency hiss. The selectable cutoff frequencies are:

• 2500 Hz

• 3200 Hz

• 3500 Hz

• 3900 Hz

• 4500 Hz

• 5000 Hz

This filter is applied after Stage 1 and 2, and is separate from the Lowpass Filter described in Appendix A.

Figure 3-4 Lowpass Filter

3.6 Output Automatic Gain Control

The output AGC (Automatic Gain Control) radio buttons are shown below. Each filter setup can have the

AGC turned off via the “No AGC” option, or have “10dB”, “20dB”, or “30dB” of AGC applied to the output

signal. When the AGC is active, it will boost a low level output signal by up to the maximum amount

specified.

Figure 3-5 Automatic Gain Control

3.7 Panel Locking Controls