

- #SUBSONIC FILTER ON AMP DRIVERS#
- #SUBSONIC FILTER ON AMP DRIVER#
- #SUBSONIC FILTER ON AMP UPGRADE#
- #SUBSONIC FILTER ON AMP PRO#
#SUBSONIC FILTER ON AMP UPGRADE#
When you’re working with the local specialty mobile enhancement retailer designing the next upgrade for your car audio system, be sure they model the subwoofers you have chosen in the enclosure they will be constructing. Pick the Right Subwoofer Amplifier for Your Car Audio System The 1,000-watt ML Power 1 from Hertz includes an -24 db/octave infrasonic filter that can be adjusted between 18 and 40 Hz. The Audison Voce AV uno is a 1,700-watt amplifier with an infrasonic filter that’s adjustable from 20 to 50 Hz and has a slope of -24 dB/octave.
#SUBSONIC FILTER ON AMP PRO#
Unfortunately, the BassBox Pro software doesn’t easily model cone excursion with a high-pass filter applied.

If we implement a high-pass filter at 25 Hz, we reduce the output at that frequency by 50% (-3 dB) and attenuate frequencies below that point even more.

So at frequencies below 25 Hz, when driven with 1,000 watts of power, the subwoofer may be damaged. The woofer doesn’t move significantly around the tuning frequency of 31 Hz (which reduces distortion) but goes crazy below that. The predicted cone excursion (in violet) of our 12-inch subwoofer in a 2-cubic-foot vented enclosure. What if we want to increase the efficiency of the subwoofer system and decide that a vented enclosure is better suited to our application? Here’s the cone excursion graph of the same woofer in a 2-cubic-foot enclosure with a vent tuned to 31 Hz.
#SUBSONIC FILTER ON AMP DRIVER#
The predicted cone excursion of a 12-inch subwoofer in a sealed enclosure powered with a 1,000-watt amplifier.Īs you can see, the driver never exceeds the maximum excursion rating, so the system doesn’t need an infrasonic filter. The graph below shows the cone excursion of a high-performance subwoofer with an Xmax specification of 17.6 mm in a sealed enclosure and driven with 1,000 watts of power. For all speakers, cone excursion increases by a factor of four for every octave lower a speaker plays. The question remains, why would we need to apply a high-pass filter to our subwoofer system? Isn’t the point of a subwoofer to reproduce as much low-frequency information as possible? The answer lies in the power handling capabilities of the subwoofer system. 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.
#SUBSONIC FILTER ON AMP DRIVERS#
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.
