Abbingdon Music Research LS-77 owner manual HF Level R1 Placement

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Listening Distance around 5m (farfield listening or monitoring)

HF Level R1

R2

Placement

+3 dB	15 R	22 R
+1.5dB	15 R	47 R
0 dB	15 R	not fitted
- 1.5dB	not Fitted	22 R

not recommended

Placement of speaker on a bookshelf or very close to walls (factory fit.)

Placement within around 1m of rear wall

Placement of speaker 2m or more from rear wall

If you feel that the tonal balance in the low frequencies of the LS-77 is not correct for you or your room, you may need to change the positioning of the LS-77. Some of the required adjustment may be due to the differences in placement or the room’s low frequency behaviour, while others may be a result of differences in taste and furnishings.

If the low frequencies are percieved as too prominent you may wish to fit the large cell foam inserts to either reduce the output of the port or you can completely seal the port using the insert made from dense foam. Typically, the closer you place your speaker to the wall, the more the port output needs to be attenuated.

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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 Reverberation time Appendix G Acoustics Background In formationAcoustics Good acousticsPage Membrane absorbers DiffusersAbsorption or Diffusion ? AbsorbersPorous absorbers Standing WavesRoom modes