3
(5)
Output Level Switch
Headphone Amplifier
The headphone amplifier can be operated with two different output
levels. In ear earphones or headphones with an impedance > 40 ohms
require a lower output voltage, therefore the switch should be pressed
“Low” (low output level).
Headphones with a higher impedance than 40 ohms require a higher
voltage (switch not pressed “High“ = high output level).
Please note that in ear earphones with low impedance can be damaged
when operating them in position “high output level“, and that in this
position the hearing will be impaired when using a low impedance
earphone.
When using in ear earphones, always work in position “Low“
(output level switch pressed)!
(6)
Volume Control
Adjusts the total volume at the earphones outputs.
Earphones Output
This volume control is switched after the limiter unit. When the Mini
Body Pack with passive volume control is connected, the maximum
volume required should be adjusted at the volume control (6), as the
volume can be set to the optimum hearing level at the Body Pack.
(7/8)
Change-Over switch Stereo / Mono-Mix (8)
PAN Control (7)
Stereo-Mode:
The device outputs the signal fed into the left input (channel 1) at the
left earphone and the signal from the right (channel 2) at the right
earphone.
Mono Mix Mode:
Channel 1 and channel 2 are mixed and output to both earphones. By
means of the pan (balance) control the ratio between both channels can
be adjusted.
If a stereo signal is connected at the Aux-Input, a Mono Mix signal is
generated automatically from this stereo signal when the switch is in
position Mono Mix.
(9)
Gain Control
Adjusts the correct working level of inputs 1 and 2, the level can
Channel 1/2
be raised up to 15dB or can be attenuated to –15dB. The optimum
working level is shown when the yellow LEDs 0dB illuminate with signal
input, and when the red limiter LEDs flicker slightly with signal peaks.
This ensures proper working of the limiter, which limits the sound level
when it escalates, e. g. due to feedbacks.
(10)
LED Status Display
Shows the internal working level before the earphone power amp with
Pan control and Stereo/Mono Mix changeover switch. The levels for
channels 1/2 and Aux Input at the gain control are set in such a way
that the yellow 0dB LEDs light when there is a signal, and the red LEDs
flicker slightly when there are signal peaks. The red LEDs light from an
internal working level of +3dB on, at +4dB the internal working level is
limited. This ensures correct working of the limiter, which limits the
sound level when it escalates, e. g. due to feedbacks.
(11)
Volume Control Aux-Input
Adjusts the correct working level of the Stereo Aux input. This control
allows to raise very low levels so that the internal working level can be
adjusted correctly. (max. +18 dB)
