Emm-labs Switchman MK II User Manual download pdf (Page 9)

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3. Special Features

3.1 Volume Control Profiles

The SwitchMan system uses a unique, fully electronic, precision volume control

circuitry. The Remote displays volume information as a step number ranging from

zero to 110. A step number translates to a predefined attenuation level applied in

the signal path. The translation curve is called a Volume Control Profile.

Current firmware release (v1.3) contains two Volume Control Profiles.

The profile selection is made through a DIP switch (OPTIONS) on the Main Unit’s

back panel. The actuators on positions 1 and 2 determine the profile number;

therefore, four profiles can be defined.

Important: SwitchMan Main Unit reads OPTIONS switch only at start-up time. Set

the desired configuration before powering up your system.

Channel Level Trim always applies 0.25 dB of gain change per step.

3.1.1 Profile 0 (factory setting, DIP pos. 1: OFF, DIP pos. 2: OFF)

The step mapping is 0.5 dB. Starting from the top step no. 110, down to step 10, a

channel gain is gradually reduced by 50 dB. Last 9 steps, down to step 1, use

coarser gain changes. At step 0 the channel is at full attenuation.

3.1.2 Profile 1 (DIP pos. 1: ON, DIP pos. 2: OFF)

The step mapping is 0.25 dB. Starting from the top step no. 110 down to step 30, a

channel gain is gradually reduced by 20 dB. Last 29 steps, down to step 1, use

coarser gain changes. At step 0 the channel is at full attenuation.

The Profile 0 and Profile 1 are both shown in Figure 1 below.

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Emm-labs Switchman MK II User Manual Page 9