Gebruiksaanwijzing /service van het product LS-77 van de fabrikant Abbingdon Music Research
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LS-77 Reference Class Professional Monitor Loudspeakers Owner ’ s Manual.
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3 The exclamation point within an equilateral triangle is intended to alert the user to the presence of important operating and maintenance (servicing) instructions in the literature accompanying this component. This component weighs over 30 kilograms.
4 Precautions This component has been tested and found to comply with the limits set out in the EMC Directive using a connection cable shorter than 3 metres. Running-In AMR estimates that the LS-77 may take between 300-500 operating hoursat fairly high sound pressure levels for all of the internal components to be fully-broken in.
5 W ARNINGS 3 Section 1 - Unp acking 7 Section 2 - Component Overview 9 Section 3 - Setup 1 1 3.1 Connecting the loudspeakers 1 1 3.2. Connecting the amplifier 15 3.3 Multi-channel set up 15 3.4 Choice of loudspeaker cable 15 Section 4 - Positioning 16 4.
6 Appendix A - Adjustment of tonal balance 25 Appendix B - Abbingdon Acoustic Setup Regime 28 Appendix C – Biamplifying the LS-77 3 3 Appendix D – The AMR Active System 36 Appendix E – LS-77 in OptiArray configurations 42 Appendix F - Acoustics Background Information 47 G .
7 Figure 1.1 - Front Panel of the LS-77 Figure 1.2 - Rear Panel of the LS-77 Section 1 - Unp acking L S 7 7 P R O F E S S I O N A L M O N I T O R - H F L F D e s ig n e d a n d E n g in e e r e d in G r e a t B r it a in LS 77 P rofessio nal M on itor - S e nsitivity : F requ en cy R e sp o n se : P e a k P r o g H a n d in g : .
8 Thank you for purchasing this AMR reference class component. W e hope you derive as much pleasure from using your new AMR LS-77 Reference Class Professional Monitors as we have enjoyed making them for you. This section refers to the unpacking of the LS-77 and its subsequent setup.
9 Figure 2.1 - LS-77 Front Fascia Section 2 - Component Overview F1. HIGH FREQUENCY driver: to r epoduce the high fr equencies. F2. LOW FREQUENCY driver: to r epr oduce the low fr equencies.
10 Figure 2.2 - LS-77 Rear Panel R1. TRANSMISSIONLINE PORT : to repr oduce the lowest fr equencies. R2. HIGH FREQUENCY LEVEL ADJUSTMENT cover: to cover the r eplaceable r esistors in the high fr equency level adjustment cir cuit. R3. SP ADE/BANANA high fr equency inputs: for connection of standar d termination speaker cables.
11 Section 3 - Setup AMR recommends the sonically superior Speakon connectors 3.1 Connecting the loudspeakers The LS-77 is fitted with shrouded binding posts prepared for bi-wiring that are standard in high end audio. However , we do not normally recommended their use.
12 Speaker Cable Speaker Cable Interconnect Cable Interconnect Cable Speaker L Speaker R Pre-amplifier Analog Outputs R Analog Outputs L Pre-amplifier LS 77 - LS 77 - LS 77 - LS 77 - HF LF Designed and Engineered in Great Britain LS 77 Professional Monitor - Sensitivity : Frequency Response : Peak Prog Handing : .
13 3.1.2 Using Binding Posts When not using AMR's or another manufacturer ’ s Speakon® equipped loudspeaker cables, you need to use a conventional two or four pole speaker cable. Please consult your authorised AMR retailer for recommendations.
14 Speaker Cable Speaker Cable Interconnect Cable Interconnect Cable Speaker L Speaker R Pre-amplifier Analog Outputs R Analog Outputs L Pre-amplifier LS 77 - LS 77 - LS 77 - LS 77 - HF LF Designed and Engineered in Great Britain LS 77 Professional Monitor - Sensitivity : Frequency Response : Peak Prog Handing : .
15 3.2. Connecting the amplifier Connect the other cable ends to the loudspeaker outputs of your switched-off power amplifier . When using Speakon® equipped speaker cables you only need to identify the correct channel and connect the cable.
16 Section 4 - Positioning The LS-77 Reference Class Professional Monitor is a T ransmissionline port loaded loudspeaker design with no unusual or extraordinary positioning demands, neither in stereo nor in multichannel applications.
17 If the speakers are positioned too close to each other , the stereo image will not seem realistic; if that distance is too wide, the image may leave an acoustic hole in the middle.
18 4.5 Levelling/Speaker Support The best surface for any compact speaker is a dedicated stand construction, providing a solid foundation and allowing the proper listening height (high frequency driver at ear height). Dedicated high quality stands are available at your AMR retailer .
19 4.6 Loudspeaker T oe-in Depending on your personal listening environment and room dimensions, the LS-77 Reference Class Professional Monitors may be angled in towards the listening area to help focus the sound radiation. This positioning will typically improve imaging, and is recommended by AMR.
20 Never use aggresive or abrasive cleaners! Section 5 - Care & Maint ainance 5.1 Care and maintenance T o maintain the aesthetic quality of the LS-77 Reference Class Professional Monitors for the long term, placing them into a very warm, very cold, or very humid environment should be avoided.
21 5.3 Power rating Due to the construction and the driver technology , the LS-77 Reference Class Professional Monitors can be driven with very high power levels. W ith a high quality amplifier , delivering undistorted signals, the LS-77 can achieve high volumes without any compromise in sound quality .
22 The following section provides a brief explanation of the most salient technical features of the LS-77. 10” High Performance Low Frequency Driver - a unique design provides unparalleled low frequ.
23 Section 7 - T roubleshooting Figure 7.1 Troubleshooting Guide Symptom Possible cause Solution No sound • incorrect audio cable connections • connect the cables correctly • incorrect amplifier.
24 Figure 8.1 - Specifications T able Sensitivity (2.83V/1m in room): 87dB Long T erm Power Handling (AES/RMS): 15 0W Peak Program Power Handling : 60 0W Impedance, nominal: 8Ohm Impedance, minimal: 6.
25 Appendix A - Adjustment of tonal balance If you feel that the tonal balance in the upper midrange and lower treble frequencies of the LS-77 is not correct for you, you may wish to change the resistor combination fitted under the cover labelled “High Frequency Level Adjustment”.
26 Below and overleaf are listed our recommendations for different listening distances and placements. However , there is not per se any specific value that is right or wrong. Please use your own preference, discernment and hearing as guide. It is right when it sounds right.
27 Listening Distance around 5m (farfield listening or monitoring) HF Level R 1 R 2 Placement +3 dB 15 R 22 R not recommended +1.5dB 15 R 47 R Placement of speaker on a bookshelf or very close to walls (factory fit.) 0 d B 1 5 R not fitted Placement within around 1m of rear wall - 1.
28 Appendix B - Abbingdon Acoustic Setup Regime The Abbingdon Acoustic Setup Regime (AASR) is a process of optimising the Speaker/room/listener placement interactively , repeatable and is rooted in decades worth of practice.
29 W ith the person speaking and continuing to walk toward the listening position while talking at the same level, listen for the next change in the voice's tonal quality . This will be the first interaction of the opposite wall and should sound like a loss of focus that seems to resonate because of the side and rear wall reflections.
30 ~″ / 100 254cm ~″ / 100 254cm ~″ / 1 15 290cm ~″ / 1 15 290cm ~″ / 1 15 290cm ~″ / 1 15 290cm 0 1 1 2 2 0 1 1 2 2 0 1 2 3 4 Figure B.1 - AASR illustrated.
31 If your floor is not carpeted (which is a bad idea acoustically) you may want to put something between the speaker stand and floor that will allow you to slide the speakers more easily , like a cloth or mat with a smooth underside.
32 W ith the most important of the rough adjustment being the front-to-back distance, mark the speakers' positions on the floor where the front edge of the speaker would be with tape, so you can always return to this position.
33 Appendix C – Biamplifying the LS-77 AMR’ s LS-77 speakers are designed from the inception with the option to be bi-ampliffied. This means that dedicated amplifiers are used to drive the low frequency driver and high frequency driver separately .
34 Speaker Cable Interconnect Cable Interconnect Cable Speaker Cable Analog Outputs Pre-amplifier Analog Outputs R L Pre-amplifier Speake rR Speake rR LS 77 - LS 77 - Speaker L Speaker L LS 77 - LS 77 - HF LF Designed and Engineered in Great Britain LS 77 Professional Monitor - Sensitivity : Frequency Response : Peak Prog Handing : .
35 Figure C.2 - System connection using banana plug/spade connector equipped speaker cables i. Connect the r espective spade/banana connector or bare wir e of the speaker cables to the LS-77, use one cable pair for the pair of binding posts labelled “HF” and the other for the binding posts labelled “LF”.
36 Appendix D – The AMR Active System For maximum performance AMR's active system allows AMR's LS-77 speakers to be driven in active mode by AMR's amplifiers.
37 D.2 - Setting up the AMR Active System Loosely place the speakers and connect the bi-amplification speaker cable supplied to each speaker , using the connector marked "LS-77". Speakon connectors are first inserted and then rotated clockwise until they lock in place.
38 Scenario 2: AM-77 CCE x 1 AM-77 x 2 (each AM-77 must be in Monoblock Power Amplifier Mode) (see page 46 of AM-77 Manual). Option cable Left channel RCA (Blue) Æ Left AM-77 Input 1 Left Channel Opt.
39 Scenario 2: AM-77 CCE x 2 (each AM-77 CCE must be in Monoblock mode) AM-77 x 2 (each AM-77 must be in Monoblock Mode) Left speaker cable connector marked "CCE" Æ AM-77 CCE 's Left C.
40 D.3 - T esting and T roubleshooting the AMR Active System Please use the AMR T est & Burn In CD's channel identification track to verify that your system’ s channel assignment is correct.
41 D.4 - AMR Active System Configuration Diagram Figure D.1 - System connection using Speakon connector equipped speaker cables i. Connect the respective Speakon connectors of the speaker cables to the LS-77 (left & right).
42 Appendix E – LS-77 in OptiArray configurations E.1 Introducing AMR's OptiArray® scalable acoustic system Above and beyond the role of an exceptional quality midfield monitor , the AMR LS-77 is designed to form the main element of the AMR OptiArray® scalable, modular loudspeaker system.
43 While one can (and should) add acoustical treatment to large spaces, these are only effective to a certain degree and not at really low frequencies.
44 AMR recommends the following OptiArray Setups: Room Size ≤ ≤ ≤ ≤ ≤ 35m 2 25m 2 –70m 2 50m 2 -140m 2 100m 2 -280m 2 200m 2 -480m 2 System Alpha Epsilon Iota Omicron Upsilon (passive) (pa.
45 AMR offers preconfigured wiring harnesses and where neccesary mounting and safety hardware for all larger OptiArray® systems. However , due to the complexity of setting up the larger OptiArray® systems we recommend to arrange the installation with your AMR retailer .
46 LS 77 PROFESSIONAL MONITOR - LS 77 PROFESSIONAL MONITOR - Speaker Cable HF LF D e sig ne d an dE n g in eered in G rea tB rita in LS 77 Professional Monitor - Sensitivity : Frequency Response : Peak Prog Handing : .
47 Appendix G - Acoustics Background Information G .1 Acoustics When we talk about making a room "sound right", we are probably dealing with room acoustics. As a science acoustics has been around for about a hundred years. Until then good acoustics happened by experiment, by experience, or simply by accident.
48 Why do we have reverberation? The speed of the propagating sound wave is very slow - at least compared to light: approx. 1 130ft. or 340m per sec. If there are no reflecting surfaces between the sound source and our ears, only the direct sound is heard and there is no reverberation.
49 G .4 Diffusers A diffuser provides diffuse reflection of the sound radiated against it. It can be a very useful solution in cases where reflections are disturbing the sound image and it is not advisory to add further absorption. So in order to reduce flutter echoes, comb filtering etc.
50 G .4.2.2 Porous absorbers These absorbers include mineral wool, foam, carpets, curtains, and so on. They can be very effective, but the thickness of the material has to be taken into account.
51 wave. Or one whole wavelength - or 1½, 2, 2½ and so on. This phenomenon is called standing waves. Actually the sound wave is not standing. But it is experienced like that because the sound pressure maxima and minima are positioned in fixed places in the room.
52 How does the standing waves influence the sound field? - The curve expresses the area of the room where the actual frequency is audible. At the minima the frequency is represented at a much lower level (sometimes -40 dB compared to the maximum).
53 Abbingdon Music Research is a subsidiary of the Abbingdon Global Group 22 Notting Hill Gate; London; W11 3JE; United Kingdom; T el: +44 (0) 870 420 5505; Fax: +44 (0) 700 596 1065.
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