Line Conditioners And Protectors - Alesis CLX440 Reference Manual

KEEP AUDIO WIRING AS FAR AWAY FROM AC WIRING
AS POSSIBLE.
Many hums come from audio cabling being too near AC wiring.
If a hum occurs, try moving the audio wiring around to see if the
hum ceases or diminishes. If it's not possible to separate the
audio and AC wiring in some instances, make sure that the
audio wires don't run parallel to any AC wire (they should only
cross at right angles, if possible).
TO ELIMINATE HUM IF THE ABOVE HAS FAILED:
A) Disconnect the power from all outboard devices and tape
machines except for the CLX-440, the mixer and control
room monitor power amp.
B) Plug in each tape machine and outboard effects device one at
a time. If possible, flip the polarity of the plug of each device
(turn it around in the socket) until the quietest position is
found.
C) Make sure that all of the audio cables are in good working
order. Cables with a detached ground wire will cause a very
loud hum!!
D) Keep all cables as short as possible, especially in unbalanced
circuits.
If the basic experiments don't uncover the source of the problem,
consult your dealer or technician trained in proper studio
grounding techniques. In some cases, a "star grounding" scheme
must be used, with the mixer at the center of the star providing
the shield ground on telescoping shields, which do NOT connect
to the chassis ground of other equipment in the system.

Line Conditioners and Protectors

Although the CLX-440 is designed to tolerate typical voltage
variations, in today's world the voltage coming from the AC line
may contain spikes or transients.
noises, and they can stress your gear and, over time, possibly
cause a failure. There are three main ways to protect against
this, listed in ascending order of cost and complexity:
• Line spike/surge protectors. Relatively inexpensive, these
are designed to protect against strong surges and spikes,
CLX-440 Reference Manual
chapter 6 • troubleshooting
These can cause audible
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