Lanzar OPTIX9 - Manual (Page 8)

TROUBLE SHOOTING GUIDE
If the Unit does not turn-on, and /or the power indicator LED is NOT
illuminated, do this :
If you experience high audible distortion or low output volume :
If you experience whining or engine noises :
1) Check and make sure that B+ and GND are not reversed
2) Check that all power wires are properly connected and has
the appropriate potential (11-16 volts)
3) Check that the fuse is intact.
4) Check that the input and output levels are set correctly. Input should
match the source and output should match the sensitivity of the host.
5) Check the crossover settings
；make sure they are correct；for high "Q"
systems, set the crossover half an octave above the desired point and for
low "Q" systems, set it 1 octave or more above.
6) Verify that the GND connection is secure, the conductor (wire) is not too
thin and unnecessarily long.
7) Check that the B+ wire is not too thin and unnecessarily long.
8) Change the power source
；try taking power from a different point.
INSTALLATION