![]() ![]() For this experiment we loaded up our trusty Isuzu Trooper with a 3510g ESP in a 1.5 cubic foot enclosure with 20 square inches of port, tuned to 35 Hz (the vehicle plays a good bit lower than that), and powered it off an M2c (2400 watt amp). In all reality, the filter will probably never get set this high, but it then begs the question… how high should the filter be set?ĭD R&D solicited the help of various people around the DD Headquarters to see at what point they could hear their music be affected by a subsonic filter. This means a subsonic filter at 50 Hz would be 24 decibels down in amplifier output at 25 Hz, subwoofer box and vehicle transfer function notwithstanding. All DD M Series and DM Series Monoblocks use 24dB/octave subsonic filters. This refers to the rate at which music will be attenuated below the subsonic filter frequency. When talking about subsonic filters, readers may hear the term “slope” thrown around. DD Tech Talk readers know we like the deep down nitty gritty beats as much as the next bass enthusiast, but we’re also not afraid of using our subsonic filter to optimize our systems. This is not going to turn into an “everything below 40 Hz is wasted information” argument, nothing is wasted if one is listening to it. In fact, it’s safe to say when a filter is indeed set to 50 Hz, a frequency like 30 Hz is still quite audible, albeit quieter than it would be if the filter was not utilized at all. What few of people actually realize, if an amplifier has a subsonic filter set at 50 Hz, everything below this is not dead and gone. What does the subsonic filter do exactly? A lot of folks would say it cuts out my low bass, and they wouldn’t be wrong. DD Audio Tech Talk | WRITTEN BY AARON TRIMBLE | 02 MARCH 2017
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