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• Adjust the dBA-level trimmer (1) to its maximum by turning it fully clockwise.
• Adjust the volume on the amplifier to minimum.
• Slide NORMAL / PINK NOISE switch (4) to the PINK NOISE-position (lowest position).
• Use a sound level meter set to "dBA" and "slow or average response" to measure the sound
pressure level at an appropriate position in the room.
• Adjust the volume on the amplifier to about 10 dBA above the desired or allowed sound level.
• Adjust the dBA-level trimmer (1) slowly until the sound level meter indicates the maximum
allowed sound level. The yellow LED's in the middle of the sound level LED-bar (6) should
illuminate and the gain reduction LED-bar should give an indication that the ARGOS is
reducing the gain.
• Slide the NORMAL / PINK NOISE switch (4) back to NORMAL (upper position).
• Mount the frontpanel coverplate and seal it. The ARGOS is ready for use.
LINE (LINE-BASED OPERATION) :
When to use ?
• When more then 1 amplifier is used and if the maximum admissible sound level is < 80dBA
• In these cases where the use of a microphone is not desired.
• When the ARGOS is used in mobile installations to protect the speakers from overload.
• When the ARGOS is used as a sound leveler.
How to calibrate ?
• Connect the LINE outputs of the preamplifier or mixing desk or to the corresponding LINE-
inputs at the rearpanel of the ARGOS.
• The microphone should not be connected.
• Slide the mode selection switch (2) to the upper position so the LINE-indicator (10) is lit.
• Slide the FAST / SLOW-switch (3) to the desired position. This switch should be set to FAST if
the level shouldn't even exceed the threshold for a short time. However, the SLOW mode
is much more pleasant to listen to because of the smooth operation.
• Adjust the "dBA-level" trimmer (1) to its minimum by turning it fully counterclockwise.
• Adjust the volume of the amplifier(s) to minimum.
• Slide the NORMAL / PINK NOISE-switch (4) to the PINK NOISE position
• Adjust the volume of the amplifier(s) to maximum.
• Use a sound level meter set to "dBA" and "slow or average response" to measure the sound
pressure level at an appropriate position in the room.
• Adjust the dBA-level trimmer (1) slowly until the sound level meter indicates the maximum
allowed sound level. The yellow LED's in the middle of the sound level LED-bar (6) should
illuminate and the gain reduction LED-bar should give an indication that the ARGOS is
reducing the gain.
• Slide the NORMAL / PINK NOISE switch (4) back to NORMAL (upper position).
• Mount the frontpanel coverplate and seal it. The ARGOS is ready for use.
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ARGOS - USER MANUAL
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