The 1,100-watt ARC Audio X2 1100.1 amplifier has an infrasonic filter that’s adjustable from 10 to 80 Hz. The Rockford Fosgate P1000X1bd amplifier has a selectable infrasonic filter fixed at 28 Hz with a slope of -12 dB/octave. ![]() We have applied a 25 Hz infrasonic filter in the PS8 Pro software. Many subwoofer amplifiers have an analog control set at frequencies between 10 and 40 Hz or a switch that enables the filter at a specific frequency. The ARC Audio PS8-Pro software showing the predicted response of a 60 Hz low-pass filter.Īn infrasonic filter is nothing more than a high-pass filter set at a very low frequency. In the case of a subwoofer, we’d typically set this at 60 or 65 Hz so that the output blends nicely with the midbass drivers in the car. This type of filter passes audio frequencies below the crossover point. The subwoofer amplifier you choose to have installed in your vehicle will almost always include a low-pass filter. If you have seen an amplifier or processor with the label subsonic, it’s incorrect. We typically associate this limit as being around 20 Hz. The word infrasonic refers to sound waves that are at or below the lower threshold of human hearing. The term subsonic refers specifically to aircraft or projectiles traveling at less than the speed of sound, or 767.27 miles per hour. Proper Filter Terminologyįirst and foremost, the proper term for this feature is an infrasonic filter. If you have subwoofers or speakers that may not play the lowest of audio frequencies at high levels, your installer can adjust this control to provide protection. ![]() ![]() If you’ve looked at any top-quality car audio amplifiers or signal processors, you may have seen an adjustment labeled as a subsonic filter.
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