Abbingdon Music Research LS-77 owner manual Power rating

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5.3 Power rating

Due to the construction and the driver technology, the LS-77 Reference Class Professional Monitors can be driven with very high power levels. With a high quality amplifier, delivering undistorted signals, the LS-77 can achieve high volumes without any compromise in sound quality. Also, as the LS-77 Reference Class Professional Monitors have a reasonably high sensitivity, even high quality amps with a medium power rating can drive the speaker to yield excellent results.

Attention must be given to amplifiers with very low power and adjustable tone controls or switches and when using equalizers or room-correction devices. These situations may result in the system trying soon to overreach the amplifier’s performance limits and may send distorted output signals to the speakers. Any damage caused under such circumstances is not covered by the AMR warranty and is easily avoided in the first place by consulting your authorised AMR retailer for advice regarding the choice of amplifier.

If you find that your system continuously lacks the necessary sound pressure level for your liking, despite using a high quality, high powered amplifier (> 120W RMS into 8 Ohm) please consider upgrading to one of AMR’s OptiArray® configurations (see Appendix E – LS-77 in OptiArray configurations) and/or the use of AMR’s own amplifiers using active crossover bi-amplification (see Appendix C – Biamplifying the LS-77). Be sure to consult your authorised AMR retailer for advise and a demonstration.

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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 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 back and side walls Distance to the loudspeakersLevelling/Speaker Support Room and furniture influence Loudspeaker Toe-inCare and maintenance Care & MaintainanceRunning-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 Acoustics Appendix G Acoustics Background In formationGood acoustics Reverberation timePage Absorption or Diffusion ? DiffusersAbsorbers Membrane absorbersPorous absorbers Standing WavesRoom modes
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