SECTION FIVE
SECTION SIX
Power on/off Powers the loudspeaker on or off. When the switch is in the downward position, the switch lamp is illuminated, and the loudspeaker
is powered on. When the switch is in the upward position the switch lamp is not illuminated and the loudspeaker is powered off.
Due to the nature of the electronics in ATC active loudspeakers it is quite normal for a sound to be heard from the speaker when the power is applied or disconnected.
The noise heard will not damage the speaker and is quite normal. Although
ATC uses the highest-grade components, a different noise may be heard from each speaker
due to slight tolerance variations in the amplifier components.
Bass Boost Adjustable with a “trimming tool” and accessed through the panel, this control allows for a variable bass boost from 0dB to +3dB.
Input Sensitivity Adjustable with a “trimming tool” and accessed through the panel, this control allows for the input sensitivity to be adjusted
from 1V to 2V / 2 .2dBu to 8.2dBu (-6dB).
Front Panel Display Indicates operational state. The SCM25A Pro Mk2 has one bi-colour LED mounted in the front facing badge (see diagram 8).
The LED is lit Green when the loudspeaker is powered on.
The LED will turn Red when the amplifier is limiting, please reduce the listening level. Persistent and/or continuous illumination of the Red LED can
result in damage to the amplifier or loudspeaker drive units.
The user features/controls of the R1-234 Pro amp are identical to the SCM25A Pro Mk2 amplifier. As a result, please refer to section 5 above.
Power on/off Powers a single amp channel on or off. The 2-channel R2-234 Pro features two power switches, the 3-channel R3-234 Pro features
three. The power switches are located on the rear panel, as shown in diagram 10. When the switch lamp is illuminated, the amplifier channel is
powered on. When the switch lamp is not illuminated the amplifier channel is powered off.
Due to the nature of the electronics in ATC active loudspeakers it is quite normal for a sound to be heard from the speaker when the power is applied or disconnected.
The noise heard will not damage the speaker and is quite normal. Although
ATC uses the highest-grade components, a different noise may be heard from each speaker
due to slight tolerance variations in the amplifier components.
Bass Boost This control is internal and only accessible by removing the top or bottom cover of the amplifier. As a result, adjustment should only
be made by a qualified technician, authorised ATC dealer or distributor. This control allows for a variable bass boost from 0dB to +3dB. Adjustment
is made via a PCB mounted trimmer and an appropriate “trimming tool” should be used to avoid damage.
Input Sensitivity This control is internal and only accessible by removing the top or bottom cover of the amplifier. As a result, adjustment should
only be made by a qualified technician, authorised ATC dealer or distributor. This control allows for the input sensitivity to be adjusted from 1V to
2V / 2.2dBu to 8.2dBu (-6dB). Adjustment is made via a PCB mounted trimmer and an appropriate “trimming tool” should be used to avoid damage.
SCM25A Pro M k2 Operation
5.1
DIAGRAM 8
DIAGRAM 7
R1-234 Remote Amp Operation
R2-234 Pro & R3-234 Pro Remote Amp Operation
6.1
6.2
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