Acoustic Energy MA1108 - Manual (Page 3)

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3. Installation
The Linear Sub is intended to be used in either
stereo audio music systems or multi-channel
audio-visual (home theatre) systems. Although it is
intended primarily to partner other products in the
Linear range it may also be used successfully with
alternative loudspeakers.
Linear Sub must be fitted with either floor spikes or
rubber feet. Floor spikes offer the highest potential
performance and should be fitted if the subwoofer
is to be placed on a carpeted floor. If spikes
are inappropiate for your floor covering,metal
protection pads,coins for example,maybe used
between the spike and the floor.
Note: Damage to the drive unit may result if Linear
Sub is placed upright on the floor without floor
spikes or feet fitted.
The rubber feet or M8 floor spikes and lock-nuts
should be fitted to the underside of the subwoofer
once it has been moved near its final location.
Carefully lay the subwoofer on its side to gain
access to the tapped holes in the underside. If
the rubber feet are to be used simply screw them
into the tapped holes and return the subwoofer to
upright. If floor spikes are to be used screw a spike
and lock-nut into each hole leaving a length of
Contents
1. Introduction
2. Handling
spike extending beyond the lock-nut such that once the subwoofer is upright
the lock-nuts will “float” just above the floor covering.
Tighten three of the lock-nuts with a 13mm spanner leaving one lock-nut
finger-tight to aid adjustment once the subwoofer is upright in its final
position. Once the final position has been established adjust the length of the
loose spike such that the subwoofer is vertical and does not rock. If the floor is
particularly uneven it may be necessary to loosen one of the tightened spikes
to ensure that the subwoofer can be levelled.
Finally, tighten all loose lock-nuts. It may be necessary to re-adjust to minimise
rock once the subwoofer has settled on the floor. Take care when installing
floor spikes. They are sharp and can cause injury or pierce electrical cables.
Linear Sub is not magnetically shielded and may cause picture distortion if
located too close to a CRT screen. Contact your dealer installer or Acoustic
Energy for advice.
4. Positioning
The position of the speakers in a home theatre installation will have great
influence over its performance. It is worth spending some time experimenting
both with the finer points of speaker positioning, as well as the larger scale
issues of room layout. Diagram One over the page illustrates an idealised
general home theatre speaker layout.
If you are already familiar with the characteristics of your room, and the way
speakers perform in it, you may already have a good feel for where to position
your Linear Sub. However, installing any new component provides a good
opportunity to review an existing set-up and perhaps make improvements.
In principle there is great freedom of position of a sub-woofer in a listening
room. In practice, however, the performance will be fundamentally influenced
by the room and position. Small changes of location, or of the acoustic
character of items in the immediate vicinity of the subwoofer, can significantly
influence its performance
.
Initially choose a site for the Linear Sub along one of the walls of the listening
room well away, but not equi-distant, from the corners. It is not necessary that
the Linear Sub be positioned along the same wall as the main loudspeakers.
Chose a solid wall (rather than a partition) and keep the subwoofer clear of
any large resonant objects - furniture panels, heating radiators, etc.
Don’t worry if, thanks to the architecture or layout of your room, it is not
practical to follow these guidelines exactly. The most important thing is to
experiment with the different options that are practical and find the best one.
Once your Linear Sub is connected and working, and you begin to become
familiar with its performance, it is likely to be worthwhile experimenting a
little more with its positioning. For example, moving the Linear Sub towards a
room corner will increase the level of low bass. This gain may however be at
the expense of bass definition and consistency over the listening area.
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