●2?2,1/3 octave, standard 2U case design ● Apply constant Q value to control filter , the plus/ attenuation can be ed ranging +/-12db and +/-6db ● Set low frequency filtering switch , and the frequency is adjustable, eliminate low frequency noise ,and project the bass speaker over-load ● imported quality chip , the whole unit has low distortion , low noise and stable performance ● Conduction through switch , convenient to match the whole system ● Standard TRS and XLR terminals , server balances input and output ● Time delay for turning on the unit for preventing impact to the amplifier when turning on ● Imported 20-travel slide potentiometer , favorable handle, and accurate frequency point control