Abbingdon Music Research LS-77 owner manual Levelling/Speaker Support

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Always place the speakers on a rigid and level surface!

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.

As an alternative, the LS-77 may also be placed on shelves, bases or furniture.

This will often restrict the sound quality, though with careful use of some basic techniques and due to the wide ranging adjustability of AMR's speakers it is possible to materially minimise any negative influence.

a)Set the speaker on a solid, rigid level surface using compliant supports (available from your AMR retailer). The surface should be free from resonances. There must me no protrusions or other obstructions in front of the speakers.

b)Place the speakers so that the high frequency drivers are at ear-height and oriented vertically.

c)If necessary the speakers can be placed with the woofer above the tweeter to make this easier to achieve.

d)If necessary the high frequency drivers can be rotated by 90 Degrees. This will be carried by your authorised AMR retailer as it requires disassembly of your speakers.

e)If the speakers cannot be placed with the high frequency drivers at ear-height use placement that elevates the high frequency drivers as close as possible to ear-height. Then use suitable means to elevate either the rear or front edge of the speaker to aim the high frequency drivers main axis at approximately ear height at the listening position.

f)If necessary, adjust both the high frequency and low frequency balance of the speakers (see Appendix A - Adjustment of tonal balance).

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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 Setup Connecting the loudspeakersUsing AMRs OptiLink Speakon Cable Speaker R Speaker L Using Binding Posts Speaker Cable Stereo Amplifier Interconnect Cable Connecting the amplifier Multi-channel set upChoice of loudspeaker cable Positioning Symmetry and room modesDistance between the loudspeakers Distance to the loudspeakers Distance to back and side wallsLevelling/Speaker Support Loudspeaker Toe-in Room and furniture influenceCare and maintenance Care & MaintainanceRunning-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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