KRK 10S manual System Controls, Volume, L o w-Pas s Fr equ ency Adjustment, Phase Switch

System Controls

ON

OFF

Volume

The input sensitivity is adjusted (counte rc loc kwis e red uce s 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 as s Fr equ ency

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.

5