June 2015 - Ed.2.1
Audio over IP decoders E411, E413, E415 & E417 technical manual
Page 11
3.7.3.
Amplified audio output
The E415 and E417 models have an internal amplifier to drive speakers directly. The amplified output is in
the rear plate of the device (
). It can be used in stereo or mono mode. Also, it can be disabled, if not
used, to reduce the device consumption.
The speakers must be connected as shown in the figure:
SPKL+
SPKL-
SPKR+
SPKR-
8
Ω
+
-
8
Ω
+
-
SPKL+
SPKL-
SPKR+
SPKR-
4
Ω
+
-
Stereo mode
Mono mode
Figure 6: Amplified output connections
Remember that besides choosing the appropriate connection, the device must be configured in
accordance. (See point 4.2.2)
The maximum output power obtained depends on the power supply chosen, as shown in point 3.2 .
There are two internal potentiometers in the device to limit the maximum output power sent to the
speakers:
Figure 7: Internal volume potentiometers
Devices are shipped with this potentiometers set to maximum value.
If the used speakers’ power is smaller than the maximum output of the device, the potentiometers must
be adjusted accordingly in order to prevent the speakers destruction.
In this case, care must be taken to adjust both potentiometers to approximately the same value.
The adjustment must be done experimentally, configuring the device to play a channel at maximum level
and adjusting the potentiometers to obtain a good sound without distortion in the speakers.
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