EMM Labs Switchman MK II - Manual (Page 9)

Page 9 of 13
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.