Alesis M1Active MKII User Manual - Page 37

Troubleshooting CHAPTER 4 TROUBLESHOOTING TROUBLESHOOTING INDEX If you experience problems while using the M1 Active/Surround systems, please use the following table to locate possible causes and solutions before contacting Alesis Technical Support for assistance. Symptom Hum or buzz No sound Unfocused sound, bass frequencies muddy or missing Cause Solution Ground loop between source and speaker Use balanced cables. Put M1 Actives on the same AC power circuit as the mixer. Speaker disconnected Check input cable connections INPUT LEVEL down Turn up input control on back panel AC power not on Blue LED on front should be on. Check switch and power input cable. Inputs out of phase Check + and connections from mixer to input. Verify "pin 2 is hot". Distorted output Subwoofer being used improperly Poor mix Power amp overloading speakers Damaged speaker components Install port plugs when using a subwoofer Compare to commercial CD of similar style: time to remix your track.... Turn down level Swap channel s to see if the problem follows the speaker; if so contact Technical Support M1 Active Mk2 Reference Manual 39