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Acoustic Energy Loudspeaker Linear Centre User Manual

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    							O W N E R ’ S   M A N U A L
    Linear 7 Rev B9/5/05, 7:44 am1 
    							Page Section
    1 1 Introduction
    1 2 Handling
    1 3 Installation
    2 4 Positioning
    3 5 Connecting
    4 6 Amplifiers
    4 7 Listening
    4 8 Specification
    5 9 The Linear Range
    5 10 Warranty
    5 11 Contact Acoustic Energy
    1 .   I n t r o d u c t i o nC o n t e n t s
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    1 .   I n t r o d u c t i o n
    2 .   H a n d l i n g
    Welcome to the Linear Centre. 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 Centre 
    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, amplifier compatibility, connection, 
    listening, matching products, specifications, 
    warranty and contact information. We recommend 
    that you read at least the first five of these sections 
    carefully before installing and using your Linear 
    The Linear Centre is a relatively delicate precision engineered product that 
    can be damaged by inappropriate handling. Please take care when unpacking 
    or moving the speaker not to touch any of the drivers. Damage to a driver 
    will at best degrade a Linear Centre’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 agents.
    The packaging should be retained for future use.
    3 .   I n s t a l l a t i o n
    The Linear Centre is intended to be used in a home theatre system located 
    either directly above or below the screen. It can be stood either directly on 
    a furniture unit, integrated within a screen stand, mounted on a dedicated 
    speaker stand or on a wall using appropriate bracket hardware. 
    Best results are likely to be gained if the Linear Centre is directly coupled 
    to the floor via a dedicated, spiked stand. If the screen stand is to carry the 
    Linear Centre it is advisable to de-couple it from the screen with the supplied 
    adhesive rubber feet so that its does not disturb the picture. If a wall bracket 
    is to be used it should be as rigid as possible and firmly attached to a brick-
    built wall.
    The Linear Centre is magnetically shielded. However, the extreme sensitivity 
    of some CRT tubes to low levels of magnetic flux may mean that, in rare 
    cases, the shielding may not be sufficient. Should your screen suffer picture 
    distortion caused by the proximity of a centre speaker contact your dealer 
    installer or Acoustic Energy for advice.
    The following section provides further general advice on Home Theatre 
    speaker positioning and room layout.
    C o n t e n t s
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    4 .   P o s i t i o n i n g5 .   C o n n e c t 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 illustrates an idealised general home 
    theatre speaker layout.
    If you are already familiar with the characteristics of your home theatre room, 
    and the way speakers perform in it, you may already have a good feel for 
    where to position your Linear Centre. However, installing any new speaker 
    component provides a good opportunity to review an existing set-up and 
    perhaps make improvements.
    The position requirements for a Linear Centre are as follows:
    •    Between 0.05 and 0.5 metres from the rear wall.
    •    Generally in-line with the display screen. 
    •    Directly above or below the display screen.
    D i a g r a m   O n e
    Don’t worry if, thanks to the architecture or layout 
    of your room, it is not practical to follow each 
    requirement or the layout diagram exactly. The 
    most important thing is to experiment with the 
    different options that are practical and find the one 
    that works best.
    Once your Linear Centre is connected (see Section 
    5) 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, reducing the distance between the 
    speaker and the rear wall will increase the level of 
    bass and low midrange making the speaker sound 
    warmer. The warmth however is likely to be gained 
    at the expense of some mid-range clarity.
    Viewing/listening position
    Alternative or Extra LeftSurround
    Alternative or Extra RightSurround
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    4 .   P o s i t i o n i n g5 .   C o n n e c t i n g
    Connecting your Linear Centre to an amplifier is 
    fundamentally a simple process, however, there are 
    some choices to be made and issues to consider 
    concerning connection mode, connectors and 
    cable type.
    Linear Centre is fitted with two pairs of binding-
    post terminals - one pair each for the low 
    frequency and high frequency drivers. Two 
    pairs of terminals enables Linear Centre to be 
    connected conventionally (single wire), bi-
    wired or bi-amplified. As supplied, the high and 
    low frequency terminals are connected together 
    by metal shorting links ready for conventional 
    The terminals can accept either stripped wires, 
    spade connectors, or 4mm plugs. Each of these 
    termination methods is potentially equally effective 
    and the choice is likely to be influenced by type of 
    speaker cable used. Your dealer, distributor or cable 
    manufacturer will be able to offer advice.
    Conventional [single wire] connection
    Conventional connection requires that the shorting links remain in place 
    between the high and low frequency terminals. Simply connect the speaker 
    cable to either pair of terminals ensuring correct connection polarity as 
    described below.
    Bi-Wire Connection
    Bi-wiring separates the low and high frequency connections and can provide 
    enhanced sound quality. A second set of cables (or alternatively, a multi-way 
    bi-wire cable) is required. The shorting links should be removed and stored for 
    any subsequent single wire use.
    The two cables for each speaker should be connected in parallel to the 
    amplifier terminals. At the speaker, one cable should connect to the high 
    frequency terminals and one to the low frequency terminals. Ensure correct 
    connection polarity as described below.
    Bi-Amplifier Connection
    Bi-amplifier connection adds a second power amplifier to the system so that 
    high and low frequency sections have dedicated amplifiers. Significantly 
    enhanced sound quality is possible. One stereo amplifier should be connected 
    to the high frequency terminals of each speaker and a second stereo amplifier 
    connected to the low frequency terminals. The shorting links should be 
    removed and stored for any subsequent single wire use. Ensure correct 
    connection polarity as described below. Follow the amplifier manufacturer’s 
    guidance on connecting the amplifier input signals.
    The shorting links must be removed for bi-amplifier connection. Failure 
    to do so will likely result in damage to the amplifiers.
    Connection Polarity
    It is important when connecting speakers to ensure that each terminal is 
    connected with the correct polarity. Positive speaker terminals should always 
    be connected back to amplifier positive terminals, and negative speaker 
    terminals connected back to amplifier negative terminals. Performance will be 
    seriously degraded if connections are made with incorrect polarity.
    Take care when connecting cables not to touch the negative and positive 
    terminals together and “short-circuit” the amplifier. Make connections with 
    the amplifier switched off.
    Choice of cable type will be influenced by the characteristics of other 
    components in your hi-fi system and your dealer or distributor will be able to 
    advise. Even so, there are some simple guidelines to consider:
    •  Cable runs to should be kept as short as possible. 
    •  Short cable runs are especially important if the cable is of relatively small 
    •  If the cable is advertised as “directional” care should be taken to ensure 
    that its orientation is as recommended.
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    6 .   A m p l i f i e r s9 .   T h e   L i n e a r   R a n g e
    It is wise before listening to your Linear Centre to make one final check of 
    the cables and connections. If all appears well begin listening at a relatively 
    low level to confirm that the system is operating as expected. Only increase 
    the volume if you are happy that the sound at low levels is fundamentally as 
    expected. If you are unhappy, turn the system off and re-check all the cables 
    and connections.
    Linear Centre may take a little time to “run-in”, and similarly the system will 
    also perhaps take some time to reach normal operating temperatures. It is 
    unwise therefore to make rapid judgements about the performance of the 
    speaker. Your ears too will take some time to adjust to the new sound, so 
    revisiting the system set-up, speaker positioning especially, is best left for a 
    few days.
    7 .   L i s t e n i n g8 .   S p e c i f i c a t i o n
    Type: Two and a half-way, reflex loaded, time 
    aligned speaker.
    Bass/Mid Drivers: 2 x 130mm pressed alloy cone 
    with 32mm thermally bonded voice coil. Shielded 
    high-power long-throw magnet system.
    HF Driver: Pre-coated textile dome with ferro-fluid 
    cooled neodymium magnet system and rear heat 
    Filter Network: 3rd order at 3.1kHz, 2nd order at 
    Cabinet: 15mm MDF carcass with composite layer 
    front panel and driver de-coupling.
    Frequency Response: 60Hz to 28kHz ±3dB 
    Frequency Range: 50Hz to 28kHz @ -6dB 
    Power Handling: 175W peak programme
    Amplifier Compatibility: 25 - 175 Watts into 8 
    Nominal Impedance: 8 Ohms 
    Sensitivity: 91dB for 1 Watt at 1 metre
    Terminals: Gold plated bi-wire binding posts
    Dimensions (H x W x D): 180 x 620 x 200mm 
    Weight: 10.5kg (single, unpacked)
    Acoustic Energy reserves the right to modify 
    product specifications.
    The Linear Centre is a relatively high sensitivity speaker that does not require 
    a generously rated power amplifier for adequate volume levels to be achieved 
    in an average listening room. A minimum of 25 and maximum of 175 
    Watts into 8 Ohms per channel is recommended. Linear Centre also offers 
    a relatively easy load to the amplifier and does not make unusually heavy 
    demands on its power delivery. 
    No overload protection systems are fitted to the Linear Centre so it is possible 
    to cause damage through over-driving. Such damage can occur whatever 
    the power rating of the amplifier and is not covered by any warranty. If ever 
    the sound at high volumes becomes distorted your Linear Centre is at risk of 
    damage. In such circumstances the volume must be reduced.
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    6 .   A m p l i f i e r s9 .   T h e   L i n e a r   R a n g e
    8 .   S p e c i f i c a t i o n
    1 0 .   W a r r a n t y
    1 1 .   C o n t a c t
    The Linear Centre is part of a range that includes 
    Linear One stand-mount speaker, the Linear Three 
    floor-stand speaker and the Linear Sub active 
    sub-woofer. 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 Sub
    Linear Sub is an active sub-woofer perfect for 
    enhancing Linear One bass performance or 
    handling the low frequency effects channel in 
    Linear 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
    Linear 7 Rev B9/5/05, 7:44 am5 
    							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. MA1107
    Linear 7 Rev B9/5/05, 7:44 am6 
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