Ecler SAM312 - Manual (Page 5)

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3. INSTALLATION
This unit has been specially designed to be placed in a standard 19" rack, taking up 1 height unit.
The SAM312 is very well suited to be operated by people with a low technical knowledge. This is why its
input sensitivity and tone controls are not easily accessible. The first ones can be internally changed by
using jumpers; the second ones from the front panel, by using a trimming screwdriver (see 6.2.).
Two considerations must be taken into account when you look for the right location where to put
your SAM312: first, maximum user comfort and second, easy access to the back panel in order to plug
several different devices to and from the mixer.
Your SAM312 has a very low power consumption, so it does not need any fan cooling, but you
should avoid exposing the unit to very extreme temperatures and the atmosphere of the room where it is
located should be as dry and dust-free as possible.
Also, you should place the SAM312 away from noise sources (dimmers, motors, etc...), as well as
from the power cables.
The SAM312 operates under voltages from 90 to 264 V at 47 to 63 Hz. This device features an
over dimensioned power supply that adapts to the mains voltage in any country of the world with no
need to make any adjustments.
In order to protect the mixer from eventual overloads, the SAM312 is protected by a timered power
fuse (24) of 0.5A. If it gets blown up, you must replace it with an identical one. NEVER REPLACE THE
FUSE WITH ANOTHER ONE WITH A HIGHER VALUE.
CAUTION: Fuse substitutions have to be performed by a qualified technician.
4. INPUTS
Your SAM312 holds two kinds of inputs in each of its channels (MIC, stereo LINE). Selection
between them is done via push button located on the back panel of the device.
- Microphones: 3 mixable channels provided with a jack connector (12) for a microphone with a
nominal input level of -50dBV (3.16mV). Internally adjustable to –30dBV (31.6mV). See diagram.
There is also another microphone input, located on the front panel (1), which is connected in
parallel with the existing one of the same channel on the back panel.
These microphone inputs allow a balanced connection; for this, you must plug a stereo 1/4" jack as
follows:
Live or direct signal > Tip
Cold or inverted signal > Center ring
Ground/Earth > Back ring
Microphones must be low impedance (200 to 600
Ω) and monophonic. For NON balanced
connections, use monophonic jacks. It is also possible to make a non balanced connection with a stereo
jack connector by shorcircuiting the center ring to ground.
The SAM312 features a phantom power supply necessary for using condenser microphones,
where the tip and the ring of the connector correspond to the positive and the sleeve to the negative
voltage. A set of jumpers let you enable or disable the phantom power supply for individual microphone
inputs. See configuration diagram. The factory default setting is enabled.