KRK 10S - Manual (Page 8)

Volume
The input sensitivity is adjusted
(counterclockwise reduces
sensitivity) with the rear panel
mounted Volume control.
Adjustment range is from -30dB
to +6dB. Factory preset gain is +6dB. You may
need to adjust this to match the level of your
monitors.
L o w - P a s s F r e q u e n c y
Adjustment
Low-Pass Frequency adjustment is
performed through a coninuously
variable adjustment. The range is
from 50Hz to 130Hz. If you are
using the Subwoofer Line Outs for the monitors,
you will want to place this at the 80Hz position
(see additional information in the
Installing Your Monitors section).
Phase Switch
Functionally, the Phase switch is a polarity inversion mechanism whose
position affects the phase relation of the subwoofer output to the other
speakers in your room. The proper switch position of 0 or 180 degrees
depends on a number of variables. These variables include, the distance of
the subwoofer from the listening position and monitors, as well as the
system's absolute polarity and the bass response of the room (refer to the Subwoofer
Setup and Placement section in order to determine the correct switch position for your
monitoring system and room).
Using the Ground Lift
Engaging the ground lift switch can sometimes reduce ground loop noise in
your system. By providing an AC mains ground on the KRK10s and proper
installation in a 'quiet studio' environment, the system is happily quiet.
However, noise will be induced if the monitor is installed in less than
desirable settings (i.e. audio cables run alongside power cables, behind
refrigerators, near florescent lighting, older buildings with bad wiring), or with certain
equipment with lots of RFI (lap-top supplies, PCs, generator supplied AC lines). This is
because there is a ground loop through the sub panel, mains wiring, source, and back to
the subwoofer on Pin-1 of the Audio inputs. Ground currents traveling through this loop
impose different voltages along the path at different gain stages within the circuitry, thus
creating noises.
The Ground lift switch does not affect the AC mains/panel safety ground. It does not 'open'
the connection thru Pin-1 to the panel, but increases the resistance (from zero ohms to one
thousand ohms) to reduce the ground current and induced noises. Safety is not
affected.
System Controls
ON
OFF
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