Asus XONAR ESSENCE - Sound Card - 192 kHz User Manual page 37

4 LFE Crossover
Frequency
32
Adjusts the cut-off frequency (20~250Hz) for LFE (low-
frequency effects) signals. Xonar Essence STX will filter out
the bass signals below the crossover frequency from small
speaker channels and forward them to the subwoofer. The
higher the crossover frequency, the more bass signals will be
subtracted.
ASUS Xonar Essence STX