Power Amp Section - Samson S4000 Owner's Manual

Controls and Functions

Power Amp Section

The S4000's power amplifier section includes the PEAK limiter and Phantom Power switch, as well
as LED indicators for the Protection Circuit. The PHANTOM POWER switch engages the power sup-
ply to allow you to connect condenser microphones. The PEAK LIMITER helps you keep the sound
clean by using an active circuit to automatically control the system dynamics. And the Protection
Circuit will help your S4000 run trouble free for years.
55. PROTECT Indicators -The S4000 mixer has a protection circuit to help
prevent damage to the power amplifiers when it is presented with a
clipped signal for an unsafe duration. The PROTECT indicators will illu-
minate when the protection circuit is active to help avoid serious dam-
age to the amplifier section. There are individual PROTECT indicators
for the left and right power amplifiers. If either of the PROTECT indica-
tors illuminate, turn the main volume down and wait for the LED to go
off. In order to keep the amplifier from going into PROTECT mode, be
sure to keep the PEAK LEDS in the MAIN meter section from lighting.
56. PEAK LIMITER Switch and Indicator - In order to keep the sound loud and clean, there is an on-
board Limiter which is a dynamic processor that helps keep the signal from clipping the power
amplifier. When you press the PEAK LIMITER switch in, the red LED will illuminate indicating
that the dynamics processing is engaged.
IMPORTANT NOTE: Unless you are using an external limiter, it is highly recommended that the
LIMITER switch be engaged at all times. This will ensure the cleanest possible output, and
will protect your speaker system when it accidentally receives a clipped signal from your mixer.
57. Phantom Power Switch and Indicator - The mixer features an onboard, 48-Volt Phantom power
supply to operate condenser microphones. When the switch is engaged, the LED will illumi-
nate indicating that phantom power is now available at the microphone preamps.
IMPORTANT NOTE: To avoid a loud pop, be sure to turn down the master level controls before
plugging and unplugging the mic cables when the phantom power is active. Be sure the MAIN
level fader is turned all the way down before activating the Phantom Power to prevent pops
from entering any external device connected to the mixer. Also, be sure the Phantom Power is
OFF when connecting or disconnecting microphones.
S4000 • Powered Mixer
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