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Acoustic Energy Loudspeaker Linear Subwoofer User Manual

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    							O W N E R ’ S   M A N U A L 
    							Page Section
     1 Introduction
     2 Handling
    1 3 Installation
    1 4 Positioning
    2 5 Connecting
    3 6 Controls and System Setup
    4 7 Specification
    5 8 The Linear Range
    5 9 Warranty
    5 10 Contact Acoustic Energy
    3 .   I n s t a l l a t i o n
    Welcome to the Linear Sub. Perhaps more than 
    any other hi-fi product, speakers are sensitive to 
    installation so please take a little time to read 
    this manual and to follow, as far as practical, 
    the installation guidelines it contains. Careful 
    installation will help ensure that your Linear Sub 
    performs optimally. Should you have any questions 
    not covered here we are happy to try and answer 
    them either by telephone or email. Contact 
    information can be found in Section 11.
    Following this introduction, the Manual is divided 
    into sections covering handling, installation, 
    positioning, connecting, controls and system setup, 
    specifications, matching products, warranty and 
    contact information. We recommend that you read 
    at least the first six of these sections carefully before 
    installing and using your Linear Sub. We would 
    also draw your attention to the Important Safety 
    Instructions on this page.
    Finally, please enjoy your Linear Sub, but remember 
    it is capable of generating high volume levels of 
    low frequency sound, so please also be considerate 
    of your neighbours.
    The Linear Sub is a relatively delicate precision 
    engineered product that can be damaged by 
    inappropriate handling. It is also large and heavy. 
    Please take great care therefore when unpacking 
    or moving it. Plan any handling in advance of 
    carrying it out - ideally with a second person to 
    help. Please take care when unpacking or moving 
    the subwoofer not to touch any of the drivers. 
    Damage to a driver will at best degrade the 
    Linear Sub’s performance and at worst result in its 
    complete failure.
    The enclosure surfaces should also be handled 
    sympathetically. Any cleaning should only require a 
    soft cloth, slightly dampened if necessary. Be wary 
    of using any polishes or solvent based cleaning 
    The packaging should be retained for future use.
    C o n t e n t s
    Important Safety Instructions
    Ensure that your Linear Sub is set to the appropriate mains input voltage before it is connected to a mains socket. The warranty does not cover damage caused by incorrect mains voltage.
    1. Read these instructions.
    2. Keep these instructions.
    3. Heed all warnings.
    4. Follow all instructions.
    5. Do not use this apparatus near water.
    6. Clean only with dry cloth.
    7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.
    8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including amplifiers) that produce heat.
    9. Do not defeat the safety purpose of the grounding-type plug. A grounding type plug has two blades and a third grounding prong. The third prong is provided for your safety. If the provided plug does not fit into your outlet, consult an electrician for replacement of the obsolete outlet.
    10. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and the point where they exit from the apparatus.
    11. Only use attachments/accessories specified by the manufacturer.
    12. Use only with the cart, stand, tripod, bracket, or table specified by the manufacturer, or sold with the apparatus. When a cart is used, use caution when moving the cart/apparatus combination to avoid injury from tip-over.
    13. Unplug this apparatus during lightning storms or when unused for long periods of time.
    14. Refer all servicing to qualified service personnel. Servicing is required when the apparatus has been damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate normally, or has been dropped.
    15. The apparatus shall not be exposed to dripping or splashing and that no objects filled with liquids, such as vases, shall be placed on the apparatus.
    16. The MAINS plug is used as the disconnect device, the disconnect device shall remain readily operable.
    17. To reduce the risk of fire or electric shock, do not expose this apparatus to rain or moisture.
    1 .   I n t r o d u c t i o n
    2 .   H a n d l i n g 
    							Page 1
    3 .   I n s t a l l a t i o n
    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 
    inappropriate 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 
    C o n t e n t s
    1 .   I n t r o d u c t i o n
    2 .   H a n d l i n g
    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 .   P o s i t i o n i n g
    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. 
    							Page 2
    D i a g r a m   O n e6 .   C o n t r o l s   &   S y s t e m   S e t u p
    The Linear Sub requires 
    connection both to mains power 
    and an appropriate audio signal. 
    The connection sockets are located 
    on the back panel illustrated 
    opposite. Leave the subwoofer 
    switched-off at the mains until all 
    connections are made and ensure 
    that the subwoofer level control, 
    also located on the back panel 
    is turned fully anti-clockwise. 
    Connecting your Linear Sub 
    to an audio signal is a simple 
    process, however, there are some 
    choices to be made concerning 
    connection mode.
    Signal Input Connections
    Linear Sub is fitted with both line-
    level and high level inputs.
    The RCA Phono socket line level 
    inputs are intended to accept 
    signals from either audio-visual 
    processors or stereo preamplifiers 
    (or integrated amplifiers incorporating preamplifier 
    outputs). Connect to these input sockets using an 
    appropriate RCA Phono connection cable. Ensure 
    that the cable is of good quality. If connecting from 
    a stereo amplifier, connect the left output to the 
    left input and the right output to the right input. 
    If connecting from an audio visual processor the 
    single subwoofer output may be connected to 
    either left or right input.
    The binding-post high level inputs are intended 
    to be used in conventional stereo systems where 
    the Linear Sub is to augment the low frequency 
    performance of a pair full range speakers, and 
    where no appropriate line-level signal is available. 
    Connect using simple twin core cable from either 
    the amplifier’s speaker terminals or from the full-
    range speaker terminals themselves. Take care not 
    to reverse the polarity of any connections (connect 
    positive to positive and negative to negative) or 
    any left/right orientation (connect left to left and 
    right to right). The binding posts will accept either 
    “4mm” plugs or stripped wires. Take care if using 
    stripped wires not to “short” the amplifier by 
    unintentionally connecting stray wires.
    Note: An alternative high level input connections 
    scheme is to connect from the stereo amplifier to 
    the subwoofer high level inputs and then from the 
    subwoofer high level outputs (see the following 
    paragraph) to the full-range speakers. This scheme 
    however both demands longer lengths of high 
    quality speaker cable and introduces unnecessary 
    connections between the amplifier and full-range 
    Signal Output Connections
    Line level and high level signal output connections 
    are also fitted to the Linear Sub rear panel. Both 
    carry an output signal identical to the input signal 
    and may be used for example to transfer the 
    signal back to a power amplifier or to multiple 
    Mains Connection
    After checking that the mains voltage specified on 
    the subwoofer rear panel is set correctly, connect 
    the subwoofer via its IEC mains input to a mains 
    wall socket. Use only the mains cable supplied with 
    the subwoofer.
    Viewing/listening position
    Alternative or Extra LeftSurround
    Alternative or Extra RightSurround
    5 .   C o n n e c t i n g 
    							Page 3
    D i a g r a m   O n e6 .   C o n t r o l s   &   S y s t e m   S e t u p
    Subwoofer Controls
    Accompanying the mains and signal input sockets 
    on the subwoofer connection panel are a level 
    control, a crossover frequency control, an auto 
    power switch and a phase reversal switch. Their 
    function and use is described in the following 
    Subwoofer Level
    The level control adjusts the volume of the 
    subwoofer relative to the satellites. Begin with 
    the level control set to around 50%. Detailed 
    subwoofer adjustment guidelines can be found in 
    the following paragraphs.
    Subwoofer Crossover Frequency
    The crossover frequency control adjusts the upper 
    frequency at which the subwoofer output is filtered 
    for the full-range speakers to take over. If the Linear 
    Sub is to be used exclusively in an audio-visual 
    system the crossover frequency should be set at 
    If the Linear Sub is to augment the low frequency 
    performance of a pair full range speakers, the 
    crossover frequency should be set to match their 
    low frequency roll-off frequency. The larger the 
    speaker, the lower its low frequency roll-off will be. Finding the optimal 
    crossover frequency setting will require experiment and adjustment, but 
    reasonable initial values for different speaker types are as follows:
    Large floor stand speaker (Linear 3): 35Hz
    Medium stand mount loudspeakers: 50Hz
    Small stand mount speakers (Linear 1): 70Hz
    Subwoofer Phase
    The phase switch reverses the subwoofer acoustic polarity. With the switch 
    set to 0° the subwoofer output is in phase with the full range speakers. With 
    the switch set to 180° the subwoofer output is out of phase. Reversing the 
    subwoofer phase can help optimise the sound of subwoofer systems. Further 
    subwoofer phase advice can be found below.
    Subwoofer Auto Power
    The subwoofer mains power switch incorporates an automatic switch-on/
    off function. With the switch set to “Auto” the subwoofer will switch on 
    automatically when an audio signal is present. It will switch off again when 
    no signal has been present for around 10 minutes. With “on” selected the 
    subwoofer remains switched-on permanently.
    Note: There is necessarily a short delay between auto switch-on and audible 
    sound from the subwoofer.
    System Setup
    Before listening to your system make one final check of the cables and 
    connections. If all appears well begin listening at a relatively low volume to 
    confirm that the system is operating as expected. Only increase the volume 
    if you are happy that the sound at low volume is fundamentally as expected. 
    If you are unhappy, turn the system off and re-check all the cables and 
    The Linear Sub may take a little time to reach normal operating temperatures 
    and to “run-in”. Your ears too will take some time to adjust to the new 
    sound, so it is unwise therefore to make rapid judgements about the 
    performance of the system.
    The most important aspect of Linear Sub setup is its integration with the 
    full-range speakers. Assuming the locations chosen for these are satisfactory, 
    adjusting the subwoofer’s location in the room, its volume level and phase, 
    and, if it is used in a conventional stereo system, its the crossover frequency, 
    should enable a good end result to be achieved.
    Select a few short examples of familiar programme material - both movie and 
    music - to use while adjusting the setup. Listen also from a variety of different 
    positions in the room. Check for balance and consistency of sound - neither 
    too much nor too little bass across the range of programme material and 
    listening positions. Experimentation and careful listening is the key to finding 
    a good subwoofer setup. 
    							Page 4Page 4
    6 .   C o n t r o l s   &   S y s t e m   S e t u p8 .   T h e   L i n e a r   R a n g e
    7 .   S p e c i f i c a t i o n
    Type: Closed box, active subwoofer.
    Drivers: Downward facing 220mm pulp cone with 
    48mm thermally bonded voice coil. High-power 
    long-throw magnet system.
    Low Frequency Cut-off: - 6dB @ 30Hz
    Amplifier: 200 Watts into 8 Ohms
    Low Pass Filter: 2nd order, 35Hz to 80Hz
    Input Sensitivity: 300mv for rated output
    Dimensions (H x W x D): 497 x 430 x 390mm 
    Weight: 26.0kg (single, unpacked)
    Acoustic Energy reserves the right to modify 
    product specifications.
    Subwoofer Crossover Frequency
    As you adjust other parameters you may find that moving the crossover 
    frequency a little from the suggested starting value is beneficial. Adjust 
    other aspects of the setup, particularly subwoofer location and phase, before 
    adjusting the crossover frequency significantly.
    Sub-woofer Volume
    Setting the subwoofer volume is important in terms of both overall system 
    balance and the demands of different types of programme material. You 
    may find that material with an emphasis on music works better with a lower 
    subwoofer volume than movie material with an emphasis on “effects”. 
    Finding a compromise between the two is a matter of subwoofer volume 
    adjustment in parallel with adjusting its position in the room.
    Sub-woofer Location
    Broadly speaking, the closer a subwoofer is to the corner of the room 
    (assuming the walls are solid) the more bass it will generate in the room (and 
    the lower its volume need be set). Moving the subwoofer closer to a corner 
    however will also tend to reduce the consistency subwoofer volume over the 
    listening room (a corner location being the worst in this respect). Positions 
    closer to the corner will also tend to change the character of the bass 
    produced by the subwoofer - it will emphasise the very lowest signals more. 
    This change in bass character with location is the variable that enables a good 
    compromise position for the subwoofer to be found.
    Sub-woofer Phase
    Switching the subwoofer phase should be left to last. If a good subwoofer 
    position is proving difficult to find, try again with the phase reversed. 
    							Page 5
    6 .   C o n t r o l s   &   S y s t e m   S e t u p8 .   T h e   L i n e a r   R a n g e
    7 .   S p e c i f i c a t i o n
    9 .   W a r r a n t y
    1 0 .   C o n t a c t
    The Linear Sub is part of a range that includes the 
    Linear One stand-mount speaker, the Linear Three 
    floor-stand speaker and the Linear Centre centre 
    channel speaker. Linear One, Linear Three and 
    Linear Centre incorporate time-aligned drivers to 
    improve image quality, depth and focus.
    Linear One
    Linear One is a compact two-way stand-mount 
    speaker that adds high resolution accuracy to the 
    imaging benefits of time alignment.
    Linear Three
    Linear Three is a true three-way floor stand speaker 
    that builds on the performance of the Linear One 
    with wider bandwidth, higher power handling and 
    enhanced detail resolution.
    Linear Centre
    Linear Centre is a centre channel speaker designed 
    to combine with the Linear One or Three for 
    perfectly matched audio-visual systems.
    Your Acoustic Energy speakers are guaranteed against original defects in 
    materials, manufacture and workmanship for 3 years from the date of 
    Under this warranty Acoustic Energy agrees to repair any defect or, at the 
    company’s discretion, replace the faulty component(s) without charge for 
    parts or labour. This warranty does not imply any acceptance by Acoustic 
    Energy or its agents for consequential loss or damage and specifically 
    excludes fair wear and tear, accident, misuse or unauthorised modification.
    This warranty is applicable in the United Kingdom only and does not in any 
    way limit the customer’s legal rights. Claims and enquiries under the warranty 
    for Acoustic Energy products purchased outside the UK should be addressed 
    to the local importers or distributors. If you have reason to claim under the 
    warranty please contact your dealer in the first instance.
    Please retain all original packaging materials for possible future use. We 
    suggest that you complete details of purchase now and keep this information 
    in a safe place for future reference.
    Purchase Date:
    Serial Numbers:
    Acoustic Energy Limited
    16 Bridge Road
    Gloucestershire GL7 1NJ
    Tel:  +44 (0)1285 654432 (Sales)
     +44 (0)1285 656890 (Technical)
    Fax:  +44 (0)1285 654430
    Email: [email protected]
    Web:  www.acoustic-energy.co.uk 
    							Acoustic Energy Limited, 16 Bridge Road, Cirencester, Gloucestershire GL7 1NJ.
    Tel: +44 (0)1285 654432 (Sales), +44 (0)1285 656890 (Technical). Fax: +44 (0)1285 654430
    Email: [email protected]
    Web: www.acoustic-energy.co.uk
    Manual Part No. MA1108 
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