Genelec 8381A - Installation and Placement; Assembling and Location Setup

ampliers is about 6 kW, the mains power
connection must be able to provide 2.2
kW of continuous power. The difference
between the mains input power and peak
output power is supplied by the amplier
power storage capacity.
When the 8381A is idle, the power
consumption is about 140 W. This is also
usually the thermal load of the 8381A as
the thermal load is caused by the amplier
unit idle power consumption while extended
playback at very high output level will
increase the thermal load.
The RAM-81 ampliers have a temperature
controlled forced air cooling, and the fan
rotation speed is normally very low and does
not cause audible noise. However, if thermal
load increases, the fan will run faster and
cause some noise. For critical application
and for maximum performance, Genelec
recommends that the RAM-81 amplier units
are remoted into a separate space, in an air-
conditioned equipment rack.
Operating and Storage Environment
The monitor enclosures and RAM-81
ampliers are designed for indoor use only.
The operating ambient temperature of the
monitoring system is 15-35 °C (50-95 °F)
and permissible non-condensing relative
humidity between 20-80 %.
If the product has been stored or
transported in cold and is then taken into
a warm room, the product must warm up
to ambient temperature inside unopened
packing for at least three hours before
opening the packing and connecting to the
mains power.
As the enclosures are made of MDF
medium fibre board, they should be
protected from water or other liquids
accumulating on the top of the enclosure
or other surfaces. Prolonged exposure to
liquids will aect the board.
Clearances Amplifier
A forced-air cooling system circulates air
into the amplier from behind, and air exits
through openings on the right side. Free
space around the amplier must be sucient
to ventilate accumulating heat.
Place the amplier so that at least 100
mm (4 in) free space is available behind the
amplier to allow for cable connections and
air circulation and the perforated side of the
amplier should be open in the rack to allow
air to ow – the rack sides must not block
the openings in the amplier.
If the amplier overheats, it shuts down
until a safe temperature is reached. When
the amplifier is placed in a constrained
environment, such as an equipment rack,
there should be sucient air conditioning
inside the constrained space to maintain the
ambient temperature below the maximum
value.
Clearances Enclosure
Space of at least 50 mm (2 in) should be left
behind and around the monitor enclosure
because the bass reex port in the lower
enclosure opens to the back and clearance
to the wall is needed to avoid reduction of
bass output or increase of distortion.
Ensure that the speaker cables can reach
the rear of the enclosure.
Mechanical Vibrations
If the flooring construction is light, the
monitor can be mounted on vibration
isolators to reduce mechanical resonances
and vibrations in the floor and other
structures. The mechanical resonant
frequency of the monitor on the vibration
mount should not be higher than 2–8 Hz for
eective vibration isolation.
Installation
See Quick Setup Guide on pages 2-4.
Delivery on Pallet
The Genelec 8381A Smart Active Monitor
is shipped in a plywood-covered pallet
containing two enclosures, two individually
calibrated RAM-81 amplier units, and an
accessory kit.
The monitor pallet is heavy; almost 200 kg
(440 lb). It should be moved carefully using
proper methods and a pallet truck.
The free opening in the door frame has
to be more than 1 m (39 3/8 in) to allow the
pallet to be taken into the room.
Before installing the system, check all
items for damage and omissions. If damage
is found, directly contact the dealer and
insurance agent. If there are any missing
components, contact your local dealer.
Opening and Accessing the
Components
The packing crate is closed with screws.
Place the create on the oor and remove the
screws at the bottom of the crate using the
correct screwdriver. Do not open at the top.
Once all screws at the bottom are
removed, lift the complete covering box (top
and sides) up and away as one unit. At least
two persons are needed for this because of
the size of the top.
Removing the complete covering box
gives easy access to all the parts.
Remove the inclining wedges and the
accessory box. Remove the ampliers.
Assembling at Installation Location
If the coaxial unit of the 8381A must be
higher than 1.2 m, place the necessary
height extension pedestal on the oor. The
necessary height extension must be supplied
separately. An optional 300 mm (12 in) height
extension block is available from Genelec.
The pedestal must be able to support the
full weight of the two enclosures, about 160
kg (350 lb). We recommend a mechanically
robust pedestal material and construction
to avoid any acoustic resonances in the
pedestal and to be able to support the full
weight of the monitor system.
Genelec recommends at least two
persons for lifting and moving the individual
loudspeaker enclosures. Please pay
attention to the weight of each enclosure
and note that hitting any objects while lifting
and moving the enclosure can cause visible
marks or even dents onto the enclosure
surface and painting nish.
First lift the bottom enclosure out and place
it to the nal installation location. At least two
persons are needed for this. To lift the unit,
hands must go under the unit. The cushioning
has openings to allows this. Note that the unit
is heavy, more than 70 kg (155 lb).
If necessary, place the inclining wedge
on the bottom unit at this time. When the
designed coaxial driver height is more than
1.2 m or if the listening position is much lower
than 1.2 m from the oor, install the correct
incliner wedge to direct the acoustic axis
towards the listening position (see Figure 5) .
Attach the wedge to the bottom enclosure
with four M4x10 Torx bolts provided in the
accessories package.
Lift the top enclosure out and place it
on top of the bottom enclosure (or incliner
wedge, if used). At least two persons are
needed for this. To lift the unit, hands must
go under the unit. The cushioning has
openings to allows this. Note that the unit is