What Is A Subsonic Filter
DD Audio Tech Talk | WRITTEN BY AARON TRIMBLE | 02 MARCH 2017
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. What few of people actually realize, if an amplifier has a subsonic filter set at 50 Hz, everything below this is non expressionless and gone. In fact, it's safe to say when a filter is indeed set to 50 Hz, a frequency like 30 Hz is withal quite audible, albeit quieter than it would exist if the filter was not utilized at all.
This is not going to turn into an "everything below twoscore Hz is wasted data" statement, nothing is wasted if ane is listening to it. 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. When talking about subsonic filters, readers may hear the term "slope" thrown around. This refers to the rate at which music will be attenuated below the subsonic filter frequency. All DD M Series and DM Series Monoblocks employ 24dB/octave subsonic filters. This means a subsonic filter at l Hz would exist 24 decibels down in amplifier output at 25 Hz, subwoofer box and vehicle transfer role notwithstanding. In all reality, the filter will probably never get set this high, only it and then begs the question… how loftier should the filter be ready?
DD R&D solicited the assistance of various people around the DD Headquarters to see at what point they could hear their music be afflicted by a subsonic filter. For this experiment we loaded upwards our trusty Isuzu Trooper with a 3510g ESP in a 1.5 cubic foot enclosure with 20 foursquare 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). A complement of DD door speakers and a lx watt per channel speaker amp were included to allow for a full range listening experience.
Each listener sat in the driver's seat and listened to music stored on their cell phones to insure that each person was familiar with their music. As they listened, a second person would plough the subsonic filter on the M2c up until the listener signaled that they could hear the divergence. Here are some of the tracks that they listened to.
| Track | Position on Knob | SS Frequency |
| Set Me On Fire – Pendulum | iii:00 | 42 Hz |
| Purple Lamborghini – Rick Ross & Skrillex | 3:00 | 42 Hz |
| The Wretched – Nine Inch Nails | 2:00 | 38 Hz |
| Correct Where I Need To Exist – Gary Allen | 1:30 | 36 Hz |
| Give It All We Got This night – George Strait | 1:xxx | 36 Hz |
| Blood – In This Moment | iii:30 | 44 Hz |
| Don't End Believing – Journey | 12:30 | 32 Hz |
| Accept A Little Ride – Jason Aldean | 3:00 | 42 Hz |
| Nosotros Will Rise – Arch Enemy | 3:thirty | 44 Hz |
| Skyhunter – Dethklok | three:00 | 42 Hz |
There'due south pretty wide range of music that was played. Styles range from country music to Drawing metal bands, all the way back to British pulsate and bass, and dubstep. Consistently, most listeners were incapable of discerning the difference betwixt a subsonic filter set at 20 Hz and i set near 30 Hz. Most folks had a difficult time perceiving output losses beneath well-nigh 36 Hz.
For the mainstream listener, setting a subsonic filter around 35 Hz will allow them to hear all their music content, missing null on whatever operation, while protecting their system. Our next manufactures will besides show ways to optimize amp power and cone circuit for the listeners bandwidth.
Some of you might take read that list and said, "Yeah but I thought you guys liked bass, where is the low stuff?" Some of our listeners were large bass heads. They know who Decaf is and they roll to DJSNT, Rusticals, and all the rest on the daily. These listeners are a special breed. Bass music does non come from an instrument with strings, brass horn or 808 samples. 25 Hz doesn't come up from anything but a pipe organ, and near of united states of america have never been to a car audio competition and demo'd someone's ride while listening to a Wurlitzer Theatre Piping Organ collection. Bass music is primarily digitally modified sine-waves being injected into other music, and information technology should be treated in it's own special style. Cheque out some of our listening testing with slowed and modified tracks.
| Track | Position on Knob | SS Frequency |
| Delusional – Tech N9ne (DJSNT) | 10:xxx | 24 Hz |
| How You Exercise That – Master P ft Young Blood (29-42 Hz) | xi:30 | 28 Hz |
| Lil One – Dirty Sprite 2 (35 Hz) | 11:00 | 26 Hz |
| Pop The Trunk – Yelawolf | 11:30 | 28 Hz |
| My Hooptie – Sir Mix-A-Lot (27, 34, 41 Hz) | 11:00 | 26 Hz |
Here, users listening to slowed music noticed the subsonic filter kicking in much sooner. Tracks with heavy doses of modified sine wave frequencies volition exist affected before, much as it would if using the DD app frequency generator, as the corner frequency of the SS filter enters the meridian of the sine wave frequency.
The purpose of this experiment was to encounter how loftier the filter could exist ready before a listener became aware that their music'due south bass was being reduced. From here we can co-operative out and look at the electrical and mechanical side of the equation. How much subsonic filter is needed to keep a woofer in control and how much is needed to maximize output while minimizing clipped betoken. Be sure to cheque in with the Tech Talk next time when we delve into the how the subsonic filter saves your amp, your sub and makes your arrangement play louder.
What Is A Subsonic Filter,
Source: https://ddaudio.com/subsonic-addiction-much-really-hear/
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