6
3.2. Mains connection
The MPA amplifiers are fed with alternate currents, depending on the country, of
110-120, 220-240V 50/60Hz (see characteristics in the back of the unit). The power
consumption at maximum performance is 370 VA for the MPA4-80 and 520 VA for the
MPA6-80. It's important that your mains installation is adequately scaled to these power
demands.
You should provide the device with a suitable earth connection, Rg= 30
Ω
or less
The environment should be dry and completely dust-free
When connecting / disconnecting cables or doing other manipulation always pull out
the mains supply cable
You should avoid that the supply cable twists with the shielded signal cables, as this
could lead to unwanted hum.
In order to protect the units from an eventual electrical overload or momentary power
peaks from the internal circuits they carry a T4 A or T6.3 A fuse (34) (MPA4-80 and
MPA6-80 respectively). Should it ever blow up, unplug the unit from mains and
replace it with an identical one. If the new fuse blows again contact immediately with our
Authorized Technical Service. YOU MUST NEVER USE A HIGHER VALUE FUSE.
3.3 Ground Link switch
The “GND LINK” switch (35) purpose is to avoid ground loops caused when several
devices in the same amplification chain are connected to earth simultaneously. This switch
disconnects the electrical ground from the mechanical ground on the housing. In case of a
ground loop (humming noise) operate this switch or alternatively the corresponding switches on
the other devices connected to the chain.
3.4 Multi-function
Depending on the input switches on the MPA4-80 (39, 40, 41, 42, 43, 44), located on the rear
panel, four different amplification configurations can be achieved:
- Four mono amplifiers with following possibilities:
Four different mono inputs
One common mono input for all
One common stereo input for all
- Two stereo amplifiers with following possibilities:
Two different stereo inputs
One single stereo input for both
- Two bridged amplifiers with following possibilities:
Two different mono inputs
One common mono input
One common stereo input
- Combinations between mono, stereo and bridged amplifiers
Summary of Contents for MPA4-80
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