Abbingdon Music Research owner manual Appendix C Biamplifying the LS-77

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Appendix C – Biamplifying the LS-77

AMR’s LS-77 speakers are designed from the inception with the option to be bi-ampliffied. This means that dedicated amplifiers are used to drive the low frequency driver and high frequency driver separately. This provides improved clarity and resolution, as the amplifier driving the high frequency driver does not have to deliver the large currents drawn by the woofer and hence will produce less distortion.

You must use two IDENTICAL stereo amplifiers to biamplify the LS-77 (AMR’sAM-77 has a build-in mode designed for optimum operation to biamplify any speakers, including the LS-77). You must also use two IDENTICAL pairs of conventional speaker cables or a special pair of “dual headed” Speakon connector cables available from yourAMR retailer.

Please refer to section 3.1 Setup - Connecting the loudspeakers for detailed information and tips on the different available connectors.

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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