r frequency response limit is 500 Hz, due to its subwoofer-specific design. 8 1 1L Audio - X0600/I Owner's Manual EFTA_R1_02095282 EFTA02705333 INFRASONIC FILTER The "Infrasonic Filter" is a 24 dB/octave high- pass filter, with a fixed cutoff frequency of 30 Hz. This filter is designed to conserve amp