Abbingdon Music Research LS-77 owner manual Troubleshooting Guide

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Section 7 - Troubleshooting

Figure 7.1 Troubleshooting Guide
Symptom	Possible cause	Solution
No sound	• incorrect audio cable connections	• connect the cables correctly
	• incorrect amplifier operation	• make sure that the input selector on the amplifier is set to
		the desired source
Sound with no bass	• check speaker connectors are not	• check polarity using the AMR test CD and correct if
and generally strange	connected with wrong polarity	required
Sound is too bright or	• Incorrect placement of speaker	• Place speaker with high frequency driver upright and at /
dull		ear hight, pointing at the listening position
	• Incorrect adjustment of HF Level	• Adjust HF level as per Appendix A
Bass is too full or lean	• Incorrect placement of speaker	• Place speaker correctly as per Section 2
	• Incorrect use of port inserts	• Add (if too full bass) or remove (if too lean bass) port
		inserts as required
Other problems		• go to the Contents section and re-trace the procedure
		or contact your nearest AMR distributor/dealer

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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 Using AMRs OptiLink Speakon Cable SetupConnecting the loudspeakers Speaker R Speaker L Using Binding Posts Speaker Cable Stereo Amplifier Interconnect Cable Choice of loudspeaker cable Connecting the amplifierMulti-channel set up Distance between the loudspeakers PositioningSymmetry and room modes Distance to back and side walls Distance to the loudspeakersLevelling/Speaker Support Room and furniture influence Loudspeaker Toe-inRunning-in the loudspeakers Care and maintenanceCare & Maintainance 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