Ground Lift; Power On/Off - KRK S8.4 User Manual

The KRK S8.4/S10.4/S12.4 studio subwoofers come equipped with both balanced stereo pairs of TRS and XLR outputs.
These outputs are for connecting your subwoofer to a pair of nearfield studio monitors. NOTE: The signal from this
output is automatically high passed above the CROSSOVER frequency setting.
[4] SUB & HPF BYPASS (FOOTSWITCH) [Footswitch not included]
There may be times where an engineer or producer will want to hear a mix only through their studio monitors without
the studio subwoofer engaged. The KRK S8.4/S10.4/S12.4 studio subwoofer comes with an input for connecting an
optional momentary footswitch (not included) to control this function. When the switch is activated, the subwoofer will
mute, and a full-range signal will be sent through the outputs to the connected studio monitors. When the switch is
deactivated, the subwoofer and crossover function will become active.
[5] POWER/STAND-BY LIGHT
This light is green when the subwoofer is on and will turn orange when it falls into STANDBY mode.
[6] VOLUME
The VOLUME knob controls the overall volume of the subwoofer. KRK recommends setting the VOLUME to the MIN
position when first connecting the subwoofer to your studio monitors. Next gradually raise the VOLUME to a reasonable
level to prevent damage to your hearing. You will also need to adjust the level of your studio monitors to make sure the
levels match properly.
[7] CROSSOVER
The KRK S8.4/S10.4/S12.4 studio subwoofers each have a built-in CROSSOVER with four crossover frequency settings to
choose from. Since studio subwoofers are designed to be used with a variety of nearfield monitors, you will need to
determine which setting is right for your room and application. For use with smaller monitors, KRK recommends starting
with the highest frequency setting and adjusting to a lower setting as needed. For larger monitors, you may need to use
the third or fourth position to find the ideal setting.
[8] INPUT SENSITIVITY
The INPUT SENSITIVITY control on your KRK S8.4/S10.4/S12.4 studio subwoofer has two options: NOMINAL and HIGH.
These settings are designed to compensate for the differences in audio sources that can be connected to an
S8.4/S10.4/S12.4 studio subwoofer. The NOMINAL setting works well with most studio recording applications while the
HIGH setting is useful for connecting to consumer electronics like a stereo receiver.
[9] POLARITY
Subwoofers are omnidirectional and phase issues may develop related to the position of other speakers in your room.
Because of this, the KRK S8.4/S10.4/S12.4 studio subwoofers come equipped with a polarity switch that can be set to
either 0 or 180 degrees in case a phase situation occurs.
[10] STAND-BY
The KRK S8.4/S10.4/S12.4 studio subwoofers come with a power-saving feature called STANDBY which can be left ON or
turned OFF. If the studio subwoofer does not receive sufficient signal after 30 minutes the subwoofer will mute and go
into STANDBY mode. To bring the subwoofer out of STANDBY mode just provide enough audio signal to the subwoofer
again but make sure to monitor the volume to keep it from being too loud on return. When the STANDBY mode is in the
OFF position, the STANDBY function is defeated.

[11] GROUND LIFT

Even the best studio environment can be subject to noise due to ground loops that can occur from the variety of
equipment that must be interconnected. Engaging the GROUND LIFT switch helps to reduce or eliminate this noise.

[12] POWER ON/OFF

The switch for turning ON a KRK S8.4/S10.4/S12.4 studio subwoofer is located on the back panel below the audio inputs,
audio outputs, and power/standby control.