Abbingdon Music Research Reference Class Proffessional Monitor LS-77 User Manual

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Section 7 - Troubleshooting

Figure 7.1 Troubleshooting Guide

Symptom

Possible cause

Solution

No sound

• incorrect audio cable connections

• connect the cables correctly

• incorrect amplifier operation

• make sure that the input selector on the amplifier is set to
the desired source

Sound with no bass

• check speaker connectors are not

• check polarity using the AMR test CD and correct if

and generally strange

connected with wrong polarity

required

Sound is too bright or

• Incorrect placement of speaker

• Place speaker with high frequency driver upright and at /

dull

ear hight, pointing at the listening position

• Incorrect adjustment of HF Level

• Adjust HF level as per Appendix A

Bass is too full or lean

• Incorrect placement of speaker

• Place speaker correctly as per Section 2

• Incorrect use of port inserts

• Add (if too full bass) or remove (if too lean bass) port
inserts as required