Acoustic Energy 308 User Manual
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3SERIES308Congratulations on choosing the Acoustic Energy 308 Sub, a powerful active subwooferwhich is capable of outstanding Hi-Fi and Home Cinema performance. Please take a fewmoments to read this guide, the advice it contains will enable you to get the very bestperformance out of your Acoustic Energy subwoofer.UnpackingPlease take care when removing the 308 from it’s packaging as the drive unit at the bottomof the cabinet is not covered by a protective grille for performance reasons and can incurdamage from improper handling. Rubber feet covers are attached for use on hard flooring,when using on carpeted flooring simply pull these off to expose spikes for improvedground coupling.SAFETYBefore applying powerThe 308 Sub has switchable power ratings to enable it to be used globally, one to operatefrom 220-240V AC line mains power and one from 110-120V AC line mains power. Pleaseensure the switch (bottom right corner of rear amp panel) is in the correct position thatrelates to your country’s mains power before use.NOTE: Our warranty does not cover damage caused by using the incorrect switch positionrelative to local mains supply.Power sourcesThe 308 should only be connected to a power supply of the type describedon its rear panel. If you are not sure consult your dealer or a qualified electrician.cont...4 14. Power switchSwitches the power ON and OFF.How to use the volume, crossover and phase controlsThe volume control, frequency knob and phase switch can be adjusted to match thecondition 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 filteredconnection (nominally 100Hz) is used, the actual settings used on the subwoofer controlpanel will vary considerably.The Sub volume control and the crossover frequency knobs should be used together whilesetting the correct bass response required. For example, raising the volume level will alsoraise the effective system crossover point, while reducing the volume has the converse effectof lowering the frequency range of the subwoofer. This is caused by the way the variousresponses and outputs blend together in the listening environment.Initially set the crossover frequency fairly low, e.g. 50-60Hz, and use the volume control knobon 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 fine tune thesound and achieve the cleanest, most extended and suitably powerful bass.NOTE: An excessive input level to the subwoofer may impair the sound quality or damagethe unit. Do not increase the output of the amplifier to a high level while the low-frequencylevel is enhanced by the amplifier’s tone or loudness controls. If the subwoofer displays signsof distress (e.g. an obvious “clapping” noise from an over-exerted drive unit) turn it down.Acoustic Energy Ltd16 Bridge Road, CirencesterGloucestershire GL7 1NJTel +44 (0)1285 654432Fax +44 (0)1285 654430www.acoustic-energy.co.uk |
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