User guide
KMT21
REV. A10
8. AMPLIFIER
8.1 AC POWER CONNECTOR
8.2 VOLTAGE REQUIREMENT
8.3 CURRENT REQUIREMENT
The amplier 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 KMT21 will operate safely, without interruption, provided the AC voltage remains within 85V- 268V, 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 270V. Doing so will
cause signicant damage to the device and create serious risk for users!
The KMT21 presents a dynamic load to the AC mains, drawing additional current as operating levels incre-
ase. 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 specications. 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.
For best performance, voltage drops should not exceed 10% at 115V or 5% at 230V.