ATC SCM20 - Page 9

ACTIVE
This adjustment provides -2dB to +3dB of cut and boost, in 1dB steps, in the form of a shelving lter. This subtracts/adds more warmth and energy
in the low frequency region. The electrical response of the lter in the six dierent positions is shown in Diagram 6 below.
When used to boost it is at the expense of:
• Accurate transient reproduction
• Reduced Headroom
• Increased distortion
Note: This adjustment should be used for ne tuning. Please try to achieve the best possible in-room bass response by rst adjusting loudspeaker
and listening position and room acoustic treatment if possible.
SCM20ASL/ASLT SECTION FOUR
Bass Shelf
4.7
DIAGRAM 6
Indicates a temporary or permanent amplier fault. The Fault LED will illuminate if amplier panel temperature exceeds 60 degrees C or if there
is a DC fault on the amplier.
In the rare case that the Fault LED illuminates:
1. Switch the loudspeaker power o.
2. Ensure the amplier heatsink has adequate ventilation and allow to cool for 45 minutes.
3. Switch it back on.
If the Fault LED remains illuminated the amplier is registering a DC oset fault within the power amplier which should be investigated by an
approved technician. Please contact your ATC dealer or distributor, details can be found at www.atc.audio. If the Fault LED is no longer illuminated,
the amplier shut down due to exceeding its safe operating temperature. Please reduce the system listening level and/or improve amplier ventilation
and continue to use the loudspeaker.
Fault
4.8