Abbingdon-music-research LS-77 Reference Class Manuel d'utilisateur

LS-77 Reference ClassProfessional MonitorOwner’s ManualVer 2.5.1

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11Never use aggresiveor abrasive cleaners!Section 3 - Care & Maintainance3.1 Care and maintenanceThe cabinet and other plain parts should be cl

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13TroubleshootingSymptom Possible cause Solution No sound • incorrect audio cable connections • connect the cables correctly• incorrect amplifier o

14Sensitivity (2.83V/1m in room): 87dBLong Term Power Handling (AES/RMS): 150WPeak Program Power Handling : 600WImpedance, nominal: 8OhmImpedance, min

15Appendix A - Tonal Balance AdjustmentIf you feel that the tonal balance in the upper midrange and lower treble frequencies of the LS-77 is notcorrec

16Listed below are AMR recommendations for different listening distances and placements. However,there is not per se, any specific value that is right

17Listening Distance around 5m (farfield listening or monitoring)HF Level R1 R2 Placement+3 dB 15 R 22 R not recommended+1.5dB 15 R 47 R Placement

18Appendix B - LS-77 OptiArray®B.1 Introducing AMR's OptiArray® scalable acoustic systemAbove and beyond the role of an exceptional quality midfi

19Ideally we wish to keep the unavoidable contribution of the room sound over the direct sound below thethreshold where the room influenced sound over

2The exclamation point within an equilateral triangle is intended toalert the user to the presence of important operating and mainte-nance (servicing)

20Epsilon/Zeta Iota/Kappa Omicron/SigmaThe following pages show the wiring diagrams and setup options for some of the recommend speakerarrangements

3ContentsWARNINGS 2Section 1 - Unpacking and Setup 5Section 2 - Component Overview2.1 Front Baffle 72.2 Rear Baffle 82.3 System Connection 9Section 3

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5Thank you for purchasing this AMR reference class component.We hope you derive as much pleasure from using your new AMR LS-77 Reference Class Profess

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7 2.1 - Front BaffleSection 2 - Component OverviewF1. HIGH FREQUENCY driver: to repoduce thehigh frequencies.F2. LOW FREQUENCY driver: to reproduce th

8 2.2 - Rear BaffleR1. TRANSMISSION LINE PORT: to reproduce thelowest frequencies.R2. HIGH FREQUENCY LEVEL ADJUSTMENT: to cover the replaceable resis

9i. Connect the respective bi-wire jumper cables as shown.ii. Connect the respectivespade/banana connector orbare wire of the speakercables to the LS-