Troubleshooting
M1 Active Mk2 Reference Manual 39
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 Cause Solution
Hum or buzz Ground loop
between source and
speaker
Use balanced cables.
Put M1 Actives on the
same AC power circuit
as the mixer.
No sound 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.
Unfocused sound,
bass frequencies
muddy or missing
Inputs out of phase Check + and -
connections from mixe
r
to input. Verify “pin 2
is hot”.
Subwoofer being
used improperly Install
p
ort
p
lu
g
s when
using a subwoofer
Poor mix Compare to
commercial CD of
similar style: time to
remix your track....
Distorted output Power amp
overloading
speakers
Tu rn d own l ev e l
Damaged speaker
components Swa
p
ch an n e l s t o see i
f
t h e
p
r ob le m f ol lo ws t h
e
spe ak er ; i f so c on t act
Te ch n i cal Supp or t