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

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Below and overleaf are listed our recommendations for different listening distances and placements. However, there is not per se any specific value that is right or wrong. Please use your own preference, discernment and hearing as guide. It is right when it sounds right.

To increase the upper midrange and lower treble frequencies compared to whatever you have currently installed use a combination marked with a greater dB value; to decrease the upper midrange and lower treble frequencies use a combination marked with a lower dB value. Should you, for any reason find the existing adjustment range insufficient please contact us for further options.

Listening Distance around 1m (nearfield listening and nearfield monitoring)

HF Level

R1

R2

Placement Suggestions

+1.5dB

15 R

10 R

Placement of speaker on a bookshelf or very close to walls

0 dB

15 R

22 R

Placement within around 1m of rear wall

- 1.5dB

15 R

47 R

Placement of speaker 2m or more from rear wall (factory fitted)

- 3 dB

15 R

not fitted

not recommended

Listening Distance around 3m (normal listening room placement and midfield monitoring)

HF Level

R1

R2

Placement Suggestions

+3 dB

15 R

10 R

not recommended

+1.5dB

15 R

22 R

Placement of speaker on a bookshelf or very close to walls

0 dB

15 R

47 R

Placement within around 1m of rear wall (factory fitted)

- 1.5dB

15 R

not fitted

Placement of speaker 2m or more from rear wall

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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 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 the loudspeakers Distance to back and side wallsLevelling/Speaker Support Loudspeaker Toe-in Room and furniture influenceRunning-in the loudspeakers Care and maintenanceCare & Maintainance 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 Good acoustics Appendix G Acoustics Background In formationAcoustics Reverberation timePage Absorbers DiffusersAbsorption or Diffusion ? Membrane absorbersStanding Waves Porous absorbersRoom modes