K-array KMT18 - Manual (Page 11)

REV. A
KMT12/KMT18
11
8. AMPLIFIER
8.1 AC POWER CONNECTOR
8.2 VOLTAGE REQUIREMENT
8.3 CURRENT REQUIREMENT
The amplifier module and any audio equipment connected to it (mixing consoles, processors, etc.) must be
properly connected to the AC power distribution, preserving AC line polarity. All grounding points should be
connected to a single node or common point, using the same cable gauge as the neutral and line cables. Bad
grounding connections within an audio system can produce noise, hum and/or serious damage to the input/
output stages in the system’s electronic equipment.
Before applying AC to any K-array self-powered speaker, be sure that the voltage
potential difference between neutral and earth ground is less than 5 VAC.
The KMT12 and KMT18’s switching power supply accommodates AC mains operating at either
115V or 230V. The KMT amplifiers will continue to operate safely, without interruption, provided the
AC voltage remains within 90 - 135V or 190 - 250V (230V), at 50 or 60 Hz. Please verify that your
AC mains connection is capable of satisfying the power ratings for the device.
CAUTION
Do not connect the system to AC power mains exceeding 250V. Doing so will
cause significant damage to the device and create serious risk for users!
The KMT12 and KMT18 present a dynamic load to the AC mains, drawing additional current as operating
levels increase. Different cables and circuit breakers heat up at varying rates, so it is essential to understand
current ratings and how they correspond to circuit breaker and cable specifications. Maximum continuous
RMS current - measured over a period of at least ten seconds - is used to calculate the temperature increase
in cables, which drives the proper size and gauge cable and rating for slow-reacting thermal breakers. Maxi-
mum burst RMS current - measured over a period of approximately one second - is used to select the rating
for fast reacting magnetic breakers.