120928_ABI-MM1001S40_QSG_ML
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N.V.
abitana
S.A.
ENGLISH
Turn on the power supply and check the functionality of the system.
Amplifier
Master 1
Amplifier
Zone 2
Amplifier
Zone 3
Amplifier
Zone 4
Amplifier
Zone 5
ABI-MM1002S05
Srn: MM1002K1001
6.4
Volume Control
The amplifier is set to maximum amplification. The output power is
controlled by setting the level of the supplied input signal in the audio
source (i.e. the volume control of the MP3 player or RCM).
It is possible to control the output power by connecting a potentiometer
or external control voltage to the 3.5mm jack on top of the unit
(
CTRL
)
6.5
Preamplifier gain setting
The main amplifier stage is preceded by a preamplifier, which has two
preamplifier gain settings: x1 (0dB) or x4 (+12dB). The choice between
the two is done by a piano switch on the front panel of the amplifier.
The x1 setting is chosen when the audio source is a high-output level
device like CD player, Tuner, Blueray player, Digital Decoder, TV set,...
(most of the non-portable mains-powered devices).
The x4 setting is chosen when the audio device is a low-output level
device like MP3 player, iPod, mobile phone, tablet,... (most of the
battery-powered portable devices).
6.5.1
Volume control using an external potentiometer
(ABI-MM1005Sxx)
It is possible to connect a potentiometer to the amplifier to control the
volume.
The volume control (potentiometer) is connected to a connector in the
wiring cabinet using the abitana cabling.
This potentiometer is supplied with a RJ45 to 3.5mm patch cord. Use
this cable to connect the potentiometer connection to the 3.5mm
volume control jack on top of the amplifier.
When another then the ABI-MM1005Sxx potentiometer is used, it must
be linear and have a value of 100K. This potentiometer can be
connected using 2 or 3 wires.
3-wires 2-wires
6.5.2
Volume control using an active control voltage or Home
Control system.
It is possible to control the output power of the amplifier by applying a
0 to 10V control voltage to the 3.5mm stereo jack on top of the
amplifier.
The amplifier will be muted when a voltage between 0V and 1V is
applied.
The volume will be controlled in 64 (logarithmic) steps by changing the
control voltage from 1V to 10V. The maximum gain will be reached at
10V.
The following drawing shows the different signals on the control
connector:
Preamplifier gain x4
Preamplifier gain x1
[OUT] REFERENCE CURRENT 100µA
SHIELDING
RING
TIP
GROUND
[IN] CONTROL VOLTAGE 0-10V
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