7
4. 1 Input selection: balanced / unbalanced
The MONO II I
–
MK 2 has balanced XLR input sockets
5.1 and unbalanced RCA input sockets
5.2
.
To connect a
preamplifier, please use one of them.
Fig. 2: INPUT SELECTION
Please press the button
INPUT SELECTION
to use the balanced XLR input
AUDIO INPUT BALANCED
or release the button to use the unbalanced
RCA input
AUDIO INPUT UNBAL.
You can use either the balanced input or the unbalanced input but not
at the same time.
In order to connect this amplifier with a separate preamplifier, e.g. the TUBE PREAMP II from ACCUSTIC ARTS
®
,
please use interconnect cables with best possible shielding and high quality connectors. This is the only way to
ensure that the sound quality of the power amplifier is fully exploited.
Fig. 3:
Pin declaration of the balanced input (XLR)
Pin 1:
Ground (shield)
Pin 2:
Non-inverting (hot; 0°)
Pin 3:
Inverting (cold; 180°)
These pin assignments comply with the standard adopted by the Audio Engineering Society. Refer to the operating
manual of your other units to verify that the pin assignments of their connectors correspond to your ACCUSTIC
ARTS
®
unit.
4. 2 Damping factor linearization
Fig. 4: DAMPING CONTROL
ON/OFF
The damping factor linearization can improve the performance of your speaker. By pushing
this button the function is activated (=
ON
).
4. 2. 1 General information
The damping factor
D
of a power amplifier is determined from the load resistance
R
L
(connected loudspeaker, but
for the measurement assessment 8 Ω resistance) divided by the internal resistance of the amplifier
R
i
.
Physical equation: D = R
L
/ R
i
D :
damping factor
(calculated number)
R
L
:
load resistance (connected loudspeaker, for the measurement assessment 8 Ω resistance) *
R
i
:
internal resistance of the amplifier (usually measured at 1 kHz) **
