Abbingdon Music Research LS-77 owner manual Loudspeaker Toe-in, Room and furniture influence

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Toe-in of the speakers often i m p r o v e s imaging!

Furniture and general room design strongly influence the sonic result!

4.6 Loudspeaker Toe-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. The ultimate positioning, however, is also a matter of personal taste and room acoustics.

4.7 Room and furniture influence

The furniture, wall materials and other objects found in the listening room may influence the sound quality of any loudspeaker. Therefore it may be necessary to adjust both the high frequency and low frequency balance of the speakers (see Appendix A - Adjustment of tonal balance) to suit your listening environment.

For example, a large room without much furniture that has many clean, hard wall surfaces may yield a bright and diffuse sound with diverse reverberating frequencies. In such a case, due to the "Controlled Dispersion" design of the LS-77, a placement with as much toe-in as is practical can reduce the reverb significantly. By adjusting the high frequency tonal balance to produce less high frequency output the bright tonal balance may be ameliorated. Nevertheless, it may also be desirable to fit some acoustic treatment or at least some carpets and maybe some heavy wall-hanging rugs or whatever means are suitable to domestic harmony.

A room with thick carpet, curtains and many soft furniture surfaces might yield a slightly warmer, darker and less lively sound. In such a case using very little toe-in and adjusting the high frequency tonal balance to produce more high frequency output can produce a more lively and open sound.

Please consult your authorised AMR retailer for recommendations and help. In order to maximise the sonic quality of the reproduction from your LS-77 speakers you may also wish to employ the Abbingdon Acoustic Setup Regime (AASR) described in the Appendix B.

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Contents LS-77 Reference Class Professional Monitor Loudspeakers Page Page Running-In PrecautionsContents Page Front Panel of the LS-77 UnpackingPlease check that all contents are present LS-77 Front Fascia Component OverviewContact 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 back and side walls Distance to the loudspeakersLevelling/Speaker Support Room and furniture influence Loudspeaker Toe-inCare & Maintainance Care and maintenanceRunning-in the loudspeakers Power rating LS- 77 Technical Features Troubleshooting Guide TroubleshootingSpecifications Table SpecificationsAppendix 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 AM-77 Control Center Edition CCE Appendix D The AMR Active SystemLine Level Connection Setting up the AMR Active SystemSpeaker Connection Scenario Testing and Troubleshooting the AMR Active System LS-77 Speaker L AMR Active System Configuration DiagramIntroducing AMRs OptiArray scalable acoustic system Appendix E LS-77 in OptiArray configurationsPage AMR recommends the following OptiArray Setups Epsilon/Zeta Iota/Zappa Omicron/Sigma Epsilon/Zeta System wiring Reverberation time Appendix G Acoustics Background In formationAcoustics Good acousticsPage Membrane absorbers DiffusersAbsorption or Diffusion ? AbsorbersPorous absorbers Standing WavesRoom modes
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