LS-77Reference Class
Professional Monitor Loudspeakers
Page
WARNINGS
Precautions
Running-In
Contents
Appendix A - Adjustment of tonal balance
Figure 1.2 - Rear Panel of the LS-77
Section 1 - Unpacking
Figure 1.1 - Front Panel of the LS-77
LS-77Professional
Upon unpacking, please find in each package
Section 2 - Component Overview
Figure 2.1 - LS-77Front Fascia
Figure 2.2 - LS-77Rear Panel
ensure no speaker con- nector is in
contact with the chassis
Section 3 - Setup
3.1 Connecting the loudspeakers
Speaker R
LS-77
LS-77
Speaker L
3.1.2 Using Binding Posts
Warning ensure
Speaker Cable
Level Adjustment HF LF INOUT
Level Adjustment HF LF INOUT
Speaker Cable
3.4 Choice of loudspeaker cable
3.2. Connecting the amplifier
3.3 Multi-channelset up
4.2 Distance between the loudspeakers
Section 4 -Positioning
4.1 Symmetry and room modes
4.3 Distance to the loudspeakers
4.4 Distance to back and side walls
4.5 Levelling/Speaker Support
4.6 Loudspeaker Toe-in
4.7 Room and furniture influence
5.2 Running-inthe loudspeakers
Section 5-Care& Maintainance
5.1 Care and maintenance
5.3 Power rating
Section 6-LS- 77 Technical Features
Section 7 - Troubleshooting
Section 8.1 - Specifications
Appendix A - Adjustment of tonal balance
HF Level
Placement Suggestions
Placement Suggestions
1.5dB
+1.5dB
Placement
HF Level R1
15 R
AppendixB - Abbingdon Acoustic Setup Regime
With the person speaking and continuing to walk toward the listening position while talking at the same level, listen for the next change in the voices tonal quality. This will be the first interaction of the opposite wall and should sound like a loss of focus that seems to resonate because of the side and rear wall reflections. Again, mark the position on the floor when the artifact first appeared with tape. You now have the front and back borders of the ZOLI
~115″/290cm
~100″/254cm
~115″/290cm
Figure B.1 - AASR illustrated
Position each speaker in the center of each ZOLI, pointing directly at the listening position. This may seem like an extreme amount of toe-in,but it is in most cases the best initial point. You should just be able to see either the inside walls or outside walls of the speakers
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Appendix C - Biamplifying the LS-77
Speaker R
LS-77
LS-77
Speaker L
Speaker Cable
Speaker Cable
Speaker Cable
Speaker Cable
AppendixD - The AMR Active System
D.1 - The AM-77Control Center Edition CCE
Scenario
D.2 - Setting up the AMR Active System
Line Level Connection
AM-77CCE
AM-77CCE
Speaker Connection
AM-77CCE
ÆAM-77CCE s Left Channel Speakon socket
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LS-77 Speaker L
D.4 - AMR Active System Configuration Diagram
LS-77 Speaker R
AppendixE - LS-77in OptiArray configurations
While one can and should add acoustical treatment to large spaces, these are only effective to a certain degree and not at really low frequencies. To effectively damp the reflection of a 350Hz tone the layer of damping material applied to the wall would have to be at least 25cm thick! Instead of damping the reverbrations, using speakers that exhibit a significant increase in directivity at all frequencies over traditional systems attains an equal or greater improvement
AMR recommends the following OptiArray Setups
Omicron/Sigma
Epsilon/Zeta
Iota/Zappa
From AMP
Speaker Cable
Epsilon/Zeta System wiring
In from Amplifier
G.2 Good acoustics
Appendix G - Acoustics Background Information
G.1 Acoustics
G.3 Reverberation time
Why do we have reverberation? The speed of the propagating sound wave is very slow - at least compared to light approx. 1130ft. or 340m per sec
G.4.2 Absorbers
G.4 Diffusers
G.4.1 Absorption or Diffusion ?
G.4.2.1 Membrane absorbers
G.5 Standing Waves
G.4.2.2 Porous absorbers
G 6 Room modes
1,0,025Hz 2,0,050Hz 3,0,075Hz 4,0,0100Hz
1,0,025Hz 2,0,050Hz 3,0,075Hz 4,0,0100Hz
0,0,162Hz 6.7m Undesirable Listening Positions
0,0,162Hz 2.8m 6.7m Desirable Listening Positions
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