TEMA TELECOMUNICAZIONI SRL
Audio Amplifier AD301R
MAS-AD301R-REV01EN
Page 8 of 12
6. DESCRIPTION OF THE CONNECTION TERMINALS
TERMINAL
DESCRIPTION
4
SPK-
Negative speaker line
Usually the black wire of the cable to connect the speakers. *
5
SPK+
Positive speaker line
Usually the red wire of the cable to connect the speakers. *
10
+ 8..18 V
DC
Positive power supply
Positive supply voltage, values between
8 V
DC
and 18 V
DC
. **
11
GND
Negative power supply / ground
Negative supply voltage.
12
IN1
Audio1 input (L)
Input of the channel 1.
It is possible to connect a stereo source by connecting the L channel
here. ***
13
IN2
Audio2 input (R)
Input of the channel 2.
It is possible to connect a stereo source by connecting the R channel
here. ***
14
GND
Audio signal Ground
* Note. When using several speakers on the same line, it is essential to connect them all with the same po-
larity to avoid phase inversions that attenuate the reproduction of medium-low tones.
** Note. It is advisable to use the
AA-39D3
power supply. It is possible to use the
AA-39D1
power supply,
obtaining however half the nominal power, which can be compensated by using horn loudspeakers that
have greater efficiency and sound output. Both power supplies are stabilized ensuring absolutely no ripple
voltage that otherwise negatively affect quality sound reproduction.
*** Note. The playback will take place on the only SPK output in mono mode because
AD301R
will add the
channel L (IN1) and the R channel (IN2) input, ensuring the exact reproduction of the content of the stereo
source.