3SERIES
308
Congratulations on choosing the Acoustic Energy 308 Sub, a powerful active subwoofer
which is capable of outstanding Hi-Fi and Home Cinema performance. Please take a few
moments to read this guide, the advice it contains will enable you to get the very best
performance out of your Acoustic Energy subwoofer.
Unpacking
Please take care when removing the 308 from it’s packaging as the drive unit at the bottom
of the cabinet is not covered by a protective grille for performance reasons and can incur
damage from improper handling. Rubber feet covers are attached for use on hard ooring,
when using on carpeted ooring simply pull these o to expose spikes for improved
ground coupling.
SAFETY
Before applying power
The 308 Sub has switchable power ratings to enable it to be used globally, one to operate
from 220-240V AC line mains power and one from 110-120V AC line mains power. Please
ensure the switch (bottom right corner of rear amp panel) is in the correct position that
relates to your country’s mains power before use.
NOTE: Our warranty does not cover damage caused by using the incorrect switch position
relative to local mains supply.
Power sources
The 308 should only be connected to a power supply of the type described
on its rear panel. If you are not sure consult your dealer or a qualied electrician.
cont...
4 1
4. Power switch
Switches the power ON and OFF.
How to use the volume, crossover and phase controls
The volume control, frequency knob and phase switch can be adjusted to match the
condition of the listening room and/or the characteristics of the left and right front speakers.
Due to the positioning of the subwoofer in the room and the associated room boundaries,
the available bass response from the existing speakers and whether or not the ltered
connection (nominally 100Hz) is used, the actual settings used on the subwoofer control
panel will vary considerably.
The Sub volume control and the crossover frequency knobs should be used together while
setting the correct bass response required. For example, raising the volume level will also
raise the eective system crossover point, while reducing the volume has the converse eect
of lowering the frequency range of the subwoofer. This is caused by the way the various
responses and outputs blend together in the listening environment.
Initially set the crossover frequency fairly low, e.g. 50-60Hz, and use the volume control knob
on the Sub to set the low bass level required. When the correct balance is almost achieved,
the crossover level, volume level and phase setting may be adjusted together to ne tune the
sound and achieve the cleanest, most extended and suitably powerful bass.
NOTE: An excessive input level to the subwoofer may impair the sound quality or damage
the unit. Do not increase the output of the amplier to a high level while the low-frequency
level is enhanced by the amplier’s tone or loudness controls. If the subwoofer displays signs
of distress (e.g. an obvious “clapping” noise from an over-exerted drive unit) turn it down.
Acoustic Energy Ltd
16 Bridge Road, Cirencester
Gloucestershire GL7 1NJ
Tel +44 (0)1285 654432
Fax +44 (0)1285 654430
www.acoustic-energy.co.uk
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