Operation; Powering On And Off; Front Panel; Gain Setting - boXem Arthur 4215/E2 User Manual

Operation

Powering on and off

The mains power switch (2) shall be used for powering the amplifier and completely switching it off.
Using the mains power switch to switch off the amplifier after listening to music is not mandatory
since the audiosense function will take care of it.
The audiosense function powers the main supply and the amplification stages as soon as a signal in
the audio range frequencies is detected on input A (6). When no such signal is detected during 10
minutes, the main supply and amplification stages are disconnected, allowing the amplifier to go in
standby with ultra-low power consumption.

Front panel

The indicator LED (8) has three modes:
- Off: the amplifier is unpowered of in standby
- Blinking: the amplification stage is in initialization phase
- On: the amplifier is ready to play music

Gain setting

The purpose of the gain setting is to adapt the sensitivity of the amplifier to the preamp or DAC
connected.
The theoretical way of setting the gain of the amplifier is to choose the highest sensitivity below the
maximum output of the preamp or DAC.
We propose another method, more pragmatic and providing good results:
1. Set the gain switch to low
2. Play not too compressed music
3. Raise the volume of the preamp/DAC until you reach -3 dB or the volume is too loud for your
taste
4. If the loudness made you stop increasing the volume, you are done
5. Otherwise, lower the volume and set the gain switch to medium
6. Repeat operations 2 and 3
7. If the loudness made you stop increasing the volume, you are done
8. Otherwise, lower the volume and set the gain switch to high
Another advantage of this method is that the gain of the amplifier will be the lowest possible,
ensuring a better protection for your speakers in case of false manipulation.
Arthur 4215/E2 User Manual
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