Abbingdon Music Research LS-77 owner manual LS- 77 Technical Features

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Section 6- LS- 77 Technical Features

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 frequency extension in a compact speaker, combined with the midrange performance only available from large dome midrange drivers while minimising distortion and thermal compression.

5” Isoplanar Ribbon High Frequency Driver - AMR’s use of a customised Isoplanar ribbon provides the smooth and clean treble associated with ribbon and electrostatic designs through a fusion of principles, yet with a design that matches and outperforms traditional dynamic high frequency drivers in terms of SPL capability and low distortion.

1” to 3/8” (25mm - 10mm) Solid Aluminum Enclosure - AMR’s use of solid aluminium as enclosure material is driven by the simple fact that aluminium is eight to ten times as stiff as the materials conventionally used. Thus an enclosure using aluminium has much lower colorations than one using conventional materials.

TransmissionLine Port Low Frequency Loading - AMR’s acoustic load combines the ability of transmissionline speakers to play very low notes loud and cleanly with the more compact dimension of traditional box designs by synthesising a new enclosure type from the best features of both.

OptiSlope® 10th Order Crossover - AMR’s unique crossover minimises any interference between low and high frequency drivers to ensures an even on- and off-axis frequency response. The crossover is hardwired using air core copperfoil inductors; highest quality custom and german made film and tinfoil/film capacitors. It is then encapsulated in a viscoelastic compound to eliminate the influence of vibration on its operation.

OptiImage® - allows exceptional stereo imaging as a result of controlled directivity that reduces the amount of unwanted reflection and acoustic reverb in the listening room.

OptiArray® - allows the LS-77 to form larger arrays with fundamentally identical performance, coherence and imaging to the single LS-77 yet with the directivity and SPL capability to fill even the largest rooms with ease.

For a more detailed explanation of these and other features, please go to: www.amr-audio.co.uk

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Contents LS-77 Reference Class Professional Monitor Loudspeakers Page Page Precautions Running-InContents Page Unpacking Front Panel of the LS-77Please check that all contents are present Component Overview LS-77 Front FasciaContact with the chassis Connecting the loudspeakers SetupUsing AMRs OptiLink Speakon Cable Speaker R Speaker L Using Binding Posts Speaker Cable Stereo Amplifier Interconnect Cable Multi-channel set up Connecting the amplifierChoice of loudspeaker cable Symmetry and room modes PositioningDistance between the loudspeakers Distance to the loudspeakers Distance to back and side wallsLevelling/Speaker Support Loudspeaker Toe-in Room and furniture influenceCare & Maintainance Care and maintenanceRunning-in the loudspeakers Power rating LS- 77 Technical Features Troubleshooting Troubleshooting GuideSpecifications Specifications TableAppendix a Adjustment of tonal balan ce HF Level Placement Suggestions HF Level R1 Placement Appendix B Abbingdon Acoustic Setup Regime Page ~100″/254cm ~115 ″/290cm Page Page Appendix C Biamplifying the LS-77 LS-77 Speaker R Speaker L Speaker Cable Appendix D The AMR Active System AM-77 Control Center Edition CCESetting up the AMR Active System Line Level ConnectionSpeaker Connection Scenario Testing and Troubleshooting the AMR Active System AMR Active System Configuration Diagram LS-77 Speaker LAppendix E LS-77 in OptiArray configurations Introducing AMRs OptiArray scalable acoustic systemPage AMR recommends the following OptiArray Setups Epsilon/Zeta Iota/Zappa Omicron/Sigma Epsilon/Zeta System wiring Good acoustics Appendix G Acoustics Background In formationAcoustics Reverberation timePage Absorbers DiffusersAbsorption or Diffusion ? Membrane absorbersStanding Waves Porous absorbersRoom modes
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