LEM AMP SERIES - Connector Cables Guide; Cable Types and Usage Rules; Cable Care and Maintenance

12
AMP SERIE
S
Connector cables
The following diagrams illustrate the wiring of the various types of sockets that can be used with the AMP
SERIES power amplifiers.
To connect the amplifier to the mixer, always make certain to use
only signal cables (screened cables
made up of two wires plus a braid screen),
not power cables (speaker cables, normally made up of two
wires, usually with a greater cross-section): the use of unscreened cables could in fact cause annoying buzzes
and background noise. The P SERIES amplifiers inputs are in fact balanced and therefore designed in
such a way that any interference on the line is eliminated or at least greatly reduced. We therefore always
suggest the use of balanced cables for microphones and line units whenever possible.
To connect the amplifier to the loudspeaker enclosures, always use
only power cables, not signal cables,
as in the latter case in fact, the power from the amplifiers would be partially dispersed because of the
cables smaller cross-section.
Take care of the connector cables. Always hold them by the connectors, avoiding pulling the wire and
avoid knots and twists when coiling them: this gives the advantage of increasing their life and reliability.
Check your cables periodically, making certain that they are in good condition, that the connectors are
correctly wired and contacts perfectly efficient: in fact, many problems and setbacks (faulty contacts, ground
hum, disturbance, etc.) are due to the use of unsuitable of faulty cables.
Connector cables

/ NEGATIVE
+
/ POSITIVE
TIP
SLEEVE
+
POSITIVE

NEGATIVE
JACK
power connector
3
GROUND
HOT
(
+
)
COLD
()
1
2
Balanced
XLR-M connector
TIP
RING
GROUND
HOT
(
+
)
SLEEVE
COLD
()
Balanced
JACK connector
SPEAKON
power
connector