Installation; Ground Loops; Audio Connections - Ecler ALMA26 Notice D'utilisation

3. INSTALLATION

The ALMA26 can be mounted in a standard 19" rack (482.6 mm) taking up one height unit
(44 mm).
For professional use it is recommended to place the processor in the same rack as the power
amplifiers.
Given the small power consumption of the unit, no ventilation is required. Nevertheless, it is
advisable not to expose the unit to extreme temperatures as well as ensure a dry and dust-free operating
environment.
It is important not to place the processor next to electrical noise sources such as transformers,
voltage dimmers, motors, etc. or their mains supply cables. The metal cover of the device should never
be removed under any circumstance for that same reason.
The ALMA26 operates with alternate current (AC) between 90 and 264V at 47 to 63Hz. This
device features an oversized power supply which adapts itself to any mains voltage around the world,
without the need of manual adjustment.
Even though the noise produced by powering up is minimum, it is always advisable to follow this
power up sequence: signal sources, mixing unit, processor and, finally, power amplifiers. The power
down sequence must follow exactly a reverse order. By closely following this sequences, all peaks or
transients produced by switching on and off devices do not affect the next devices in the chain and, of
course, never reach the loudspeakers, which are extremely sensitive about this.

Ground Loops

Care should be taken, so that the different mechanical and electrical grounds, as well as the
chassis and ground connections arriving to the device, to be independent from each other.
Ground loops can be easily detected through a low frequency hum noise (50Hz). Depending
on the level of this noise, it can interfere on the music quality.

Audio connections

Usually, many people do not care enough about the quality of cables. Many times, because of a
bad connection or bad quality cables, there can be important problems during the music reproduction.
6