Abbingdon Music Research LS-77 owner manual Testing and Troubleshooting the AMR Active System

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D.3 - Testing and Troubleshooting the AMR Active System

Please use the AMR Test & Burn In CD's channel identification track to verify that your system’s channel assignment is correct.

If the low frequency channels have been mixed up the channel identification sequence will have the high frequencies coming from one channel with the low frequencies from the other. In this case please switch around the interconnects or speaker cables (one OR the other, not both) for the power amplifier. Please power down the all amplifier(s) before breaking and re-making connections.

If the sound lacks severely in high or low frequencies and either high or low frequency driver remain silent, please check all connections between speaker, amplifiers and CCE again and compare to these notes and the included drawings.

Play some music with a large amount of high frequency and low frequency content. If the high and low frequencies appear rolled off, please check that the speaker cable connectors labeled CCE are attached to the AM-77 CCE and that the speaker cable connectors labeled AM-77 are attached to the AM-77(s) configured as power amplifier(s).

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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 Appendix G Acoustics Background In formation AcousticsGood acoustics Reverberation timePage Diffusers Absorption or Diffusion ?Absorbers Membrane absorbersStanding Waves Porous absorbersRoom modes