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March 2019 Weve now covered the purpose of a subsonic filter and how it works. August 2015 Its tuned at 20hz. Necessary cookies are absolutely essential for the website to function properly. Receive exclusive offers and promotions. The best thing to do is have the sub have a range of frequency response curves to choose from, like SVS's Ultra subs or Hsu's subs. Or is there at least a subsonic limit to the LFE channel bandwidth? It is adjustable from 6dB/Oct to 24dB/Oct with 6dB increments. Technical & Advanced Car Audio Discussion. His other interests include astronomy, hiking, and fishing. May 2016 They're right- the answer is No. Message User. So if im tuned to 33hz, I set my SF to 25hz? Great info by the way!! Michael MiguestJames LuongJohn WheelerJean NantaisKevin Barrett, March 2023 The number chosen here means the frequencies above will be filtered away to avoid high tones coming from your subwoofer nobody wants to hear Diana Kralls voice through the subwoofer anyways. That means the safest setting for its subsonic filter is half an octave below whatever frequency the port is tuned to. JavaScript is disabled. I have no clue what I would like the best.. Good point the sealed could tame peaks better and room gain could get me to where I want to be.. It will unload under tuning and xmax. Then adjust it back up until the bass notes tighten up again. For the crossover. If On is selected, then the Low Pass Filter will be disabled. Were right there with you. WebBasically, with the subsonic off, play a 27 Hz test tone, measure the AC output voltage, multiply that number by .707, and then turn the knob up until the voltage hits that target. (frequency always indicated by corresponding LEDs). I don't have it turned up loud enough to ruin my sub even at 10hz so I am not worried about that just wondering what the lower bass notes will be like tuned at 20hz. In other words, its what we know as a high-pass filter: a filter that lets through signals above a certain Hz threshold and attenuates any signal below that threshold. For music setups the phase needs to be adjusted so the subwoofer blends with the front speakers. April 2016 Especially on some ported subs. The next step is knowing how to make your high-pass filter work for you. Selectable subsonic filter settings, that will filter away the deepest frequencies. Too many subsonic notes can still damage your subwoofer. I setup my sub one time and have not touched it once since then (EQ'ed though). It is recommended to set up a very subsonic filter with a very steep slope (attention factor) to combat this issue., You can set the subsonic filter on your 1723 Series Subwoofers in the Crossover Menu and for the 1961 Subwoofers in the Setup Menu. OK, so if the port tuning frequency is 40Hz then your subsonic should be set to 40Hz which is pretty high. It has very extensive dsp options and probably cheaper than selling your qsc amp and buying an inuke. So I decided to search the Internet and found your write-up confirming my experience. The subsonic filter is actually an active Tschebyscheff high pass filter of the fifth order. If youre a true bass-head, you might be incensed at the idea that youd want to cut out subsonic frequencies. But if you understand how to adjust your subsonic filter and practice doing it right, you might reap some big rewards. This feature inverts the signal, which means the same as 180 degrees phase, however, this is true 180 degrees at all frequencies. when using subs in a vented box, you do want a subsonic filter, otherwise the subs will try to reproduce frequencies below the ports' tuned frequency, which is often 35-45Hz, and well above the lowest frequency the subs can hit (particularly since boxes are usually tuned If you dont like to crank your volume up that far, you might never notice any difference in subsonic sounds. Where this gets to be a bit more murky is in finding the best combinations of 1)number of ports plugged 2)room size setting 3)subsonic filter setting and 4)SPL for a given room. To be effective, a subsonic filter has to be very steep - this allows all wanted frequencies to get through, and rejects those that will only cause problems. I wasn't able to find frequency response specs for these, but starting your low pass filter at 80hz is a good place to start. Most subs have a filter built into the plate amp to protect the driver from damage from super low frequencies that it can't produce. Verify the level equidistant for each sub. In your case your filter goes to 35 so that's what you use. Put on your favorite song and turn the volume up to your normal listening level. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. A collision, Turbidity is considered a good measure of the quality of water as it is a measurement of how. Especially on some ported subs. We recommend this setting for smaller rooms and/or to get a faster, more musical and punchy sounding bass. November 2015 Others have adjusted theirs at multiple volumes and havent noticed any difference. Pioneer 880PRS~boston comps/alpine coax on Kappa 4 Z~back to Alpine mrd-m500 v12 on pyle 15s IB. Selectable from 12 Hz to 31 Hz. I flipped it on and off multiple times just to confirm my observations. Ultimately, I agree with you that that is a very good approach. March 2017 make the port 6% longer should tune it a little lower. What vehicle is this? The Subsonic is now correctly set. I usually just try to play the lowest hitting song i can find or some sine waves and turn it up as loud as i would have it then adjust it so it doesn't bottom out. when I run a movie I have to find the right setting because every movie sounds different. (To learn more about frequencies and how they work, check out our Beginners Guide to Frequency Ranges.). And what's your buddy's vehicle? Since its tuned at 20hz will that act as a subsonic filter for 10 to 15hz or not at all? So, if you already set the LPF frequency to 100Hz, then setting the LPF Slope to 12dB/Oct will ensure that the signal has 12dB lower output at one octave above 100Hz (one octave above 100Hz is 200Hz). August 2020 Play some of your favorite bass-heavy tracks and adjust the filter threshold until the low notes start reverberating. September 2013 Resolution was greatly improved with excellent transparency. If you're looking for extreme protection of the sub, then the higher slope (24) is better. 20-30Hz high pass. Most amplifiers have a 12 dB crossover slope on the LPF, so if you set the LPF higher, you will get punchy bass and it will hit very hard, but if you keep it at 60-80 Hz you will get smoother lower more pleasant bass. I tend to spend more time up front getting it where I think it is good, by testing like you do, with a variety of music and movies and adjust for probably a few weeks until I get something that suits my needs. December 2017 The typical Tschebyscheff resonance of 0.1 dB does not cause any distortion. Within that band, itll vary depending on your chosen music and the rest of your setup. Bass boost source: boobland.club Bass boost increases the volume at a certain frequency, usually at 40-45 Hz. JavaScript is disabled. I don't have it turned up loud enough to ruin my sub even at 10hz so I am not worried about that just wondering what the lower bass notes will be like tuned at 20hz. Subsonic its the same high-pass filter (HPF) on the sub amplifiers (often on monoblocks) cuts off infrasound. EQ2 Half an octave above the EQ1 setting, so for example if on EQ1 the subwoofer has a +-3dB point of 16Hz, the EQ2 setting will have a +-3dB point of 24Hz. So you want to delay the signal to the closest subwoofer by 1 meter (1 / 343 * 1000 = 2,915 ms). Now, it gets a little more complicated. This eliminates the bizarre subsonic sine wave almost all LPs have. You're not going to blow up your car playing below tuning. Just don't be reckless with it. SSF @ 25hz is fine. April 2015 Great advice with the test tone. A round port is 3" x 3". My port is 16" wide x 3" high and 39" long. # Low friction, completely stable dual pivot bearing design for vertical movement. Setting the Subsonic Filter and Bass Boots. WebComplete with multiple DSP functions including 7-band PEQ, LPF, phase, subsonic filter, limiter, delay, and HPF the SPA250DSP gives you the ultimate control to fine tune your audio system. October 2020 The subsonic filter is actually an active Tschebyscheff high pass filter of the fifth order. June 2016 These cookies do not store any personal information. Plenty of genres never get anywhere near the 50 Hz range. Right, or play tones lower and lower and when it unloads The Fora platform includes forum software by XenForo. (anthem arc) But I think I can only set the high pass as low as 20hz thus loosing anything below that.. Hi. How to set a subsonic filter on a subwoofer? Now Available: Tech Talk Podcast with Scott Wilkinson, Episode 19. Thanks for your advise on this topic. The subsonic filter is actually an active Tschebyscheff high pass filter of the fifth order. Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. You'll find everything you want to know about car audio and get installation help, tips and great deals on your car stereo projects. Thanks for the responses, I guess I'll continue doing it by ear then. Each octave up is twice as many Hz as the previous one, and dividing any frequency by 2 takes it one octave lower. MY TURNTABLE is a thorens td 125 fully modded pretty quiet but I still believe not 100% sure that the subsonic filter degrades my sound a little. A sub sonic is for when your playing loud below tuning it helps keep the sub under control and not over extend or hit the back plate. Subsonic Filter & Balance This preamp has a subsonic filter which can help make older records with more noise sound better. First the subsonic filter. Subsonic notes sound awesome, but they damage your hardware when they get out of control. Mhycoal 3 yr. ago You should stick to sealed without a subsonic unless you have a DSP that can apply a Hpf to the signal Any difference could cause noticeable phase shift in the output signal. December 2021 # New armtube incorporating bi-metalic technology to reduce resonance and increase rigidity. There are many DIY sub builders on the forum and they sometimes install a subsonic filter before the amplifier if they want to cut out certain low frequencies from the driver. Your favorite music genres will push the limits of the low end. First the subsonic filter. basically, if you tune the box higher, and/or you will gain some spl, but excursion increases below the roll-off. June 2014 Keep an eye on the subs to make sure they aren't bottoming out a d just keep playing with it until you find a setting you like best. If you want a little less rolloff, go with an 18 or 12db. February 2017 As far as LPF, it's almost the opposite of a subsonic. The Low Pass Frequency is adjustable from 30 Hz to 160 Hz in 1 Hz increments. Think of the filter as a slope, not an on-off switch., Subsonic Filters are particularly important if you spin vinyl records as they can have possible warping that causes a phenomenon known as woofer pumping. In other words, its what we know as a high-pass filter: a filter that lets through signals above a certain Hz threshold and attenuates any signal below that threshold. All of HPF settings will very on how good your subs suspension is, some can play a mean free air and some will bump the backplate, lol. Selectable from 12 Hz to 31 Hz. November 2012 The only thing you do need to know before we move on is that attenuation doesnt completely dampen sounds of a certain frequency. For Home Cinema use, where an AVR is used we recommend LPF Bypass On. When using bass-boost chance to burn subwoofer rises as clipping occurs much earlier. Cheers! its about time someone does a write up on this. thanks op.. sticky it, still waiting on sticky. now plz o wait, doign a noob thing here and e As a result power handling decreases dramatically and excursion is uncontrolled which could result in damage to the driver, specifically physical damage as a result of over excursion at even modest power levels. If not, its ported. An electric arc lighter uses high voltage, I recently picked up a couple of microwave motion sensor radar modules. You can still turn on your subsonic even on a sealed box. EQ1 Gives a flat ground plane response to under 20 Hz, which will give great emphasis on the deepest bass in-room. March 2014 If you have an amplifier, preamplifier, subwoofer, or any other unit with a subsonic filter, and you want to use it in a way that wont destroy it prematurely, you need to know what your subsonic filter is and how to adjust it. a power requirement! For a better experience, please enable JavaScript in your browser before proceeding. 0 comments 100% Upvoted Log in or sign up to leave a comment Log In Sign Up Sort by: best no comments yet Be the first to share what you think! A forum community dedicated to home theater owners and enthusiasts. A forum for all things Trailblazer SS including mileage, horsepower, transmissions, interior mods, tires and more! I learn something new everyday, I'm glad I asked this question because otherwise I would have never know how to actually set the ssf and whether to use it or not. For movies this can be especially appealing. If I set it to flat, (fine for sealed) then it will not apply a filter and the sub could over drive when lower than tuning frequency. Technical specifications Pro-Ject Tube Box S2 Thats where all the bone-shaking, window-rattling fun is! September 2014 I keep them off if in a sealed "On a long enough timeline, the survival rate of everyone drops to zero.". The low pass can start anywhere above the low pass frequency of the I have since added some more absorption to help counter a 60Hz suckout, (fiberglass batts under some end-tables) but nothing else. A ported sub can safely play about half an octave below its tuned frequency before theres a risk of damage. Subsonic . January 2015 it will attempt to quieten the notes that are below that frequency. It is easy to set all you need are test tones and a multi-meter. If there was such a receiver with this subsonic filter built in they would be using it. Owner Stereo Integrity Co-owner Obsidian Car Audio Associate Sundown Audio Possible settings are 40, 43, 50, 53, 60 and 63dB. Subsonic covers the low end and will be set according to the subs enclosure. Think of the filter as a slope, not an on-off switch. December 2018 The maximum useful frequency is 3 MHz. January 2016 Edit. Therefore, to get your subsonic filter setting, take your subwoofers tuned frequency and multiply it by 0.75. (Optional) Get an app for your phone. Not even close! so if the bass is up too high it drowns out everything else. I have a few test LPS and when I put it on the silent groove test I can see that my 15 inch (JBL L300 Moniters) sub moves a little with my amp which is a little weird cause my amp is supposed to cut at 20hz. bad contacts- main source of miracles in electricity. My remaining question is should I leave this setting on while either listening to CD's or watching TV/movies? The subsonic filter should be set slightly below the tuning frequency of the port in your box. For a better experience, please enable JavaScript in your browser before proceeding. There was a lot of drone in that 60-80 Hz range. Seriously considering the mindsp but I have a concern. Feet / Speed of sound (1125 f/s in room temperature) * 1000 = time in ms. The push button turns on and off subsonic filter . EQ3 One octave above the EQ1 setting, so for example if on EQ1 the subwoofer has a +-3dB point of 16Hz, the EQ3 setting will have a +-3dB point of 32Hz. Sign up to newsletter and stay in touch with us, Copyright 2015-2023 Arendal Sound - All rights reserved. If the circuit is applied to a stereo unit, build an exact duplicate for the other channel. The best way is to do exactly what you are doing. October 2014 Don't install suckage! PFM Subsonic Filter: The Epicenter Concert Series utilizes a PFM (Programmable Frequency Match) filter which will help with speaker control and amplifier power management. 100-120Hz high pass. Thanks for the replys. The hertz scale is logarithmic. October 2012 Copyright 2023 House Grail. Set the subsonic filter at about Fs or about 15% below the port tuning frequency (FO) whichever is higher. Typically, EQ2 setting will sound faster than EQ1 as it has a lack of output in the deepest bass which will give the bass a heavier sound to it. February 2014 It When you buy via links on our site, we may earn an affiliate commission at no cost to you. Selected value is indicated by LED. April 2017 First, you will need to There are many DIY sub builders on the forum and they sometimes install a subsonic filter before the amplifier if they want to cut out certain low frequencies from the driver. and a low pass for the other 7 speakers at 80hz. Frequencies blow 10 Hz are attenuated by more than 35 dB. These cookies will be stored in your browser only with your consent. The best thing to do is listen. 2-way speaker systems. We recommend this setting for larger rooms. Setting your subsonic filter correctly eliminates the excursion demands on the subwoofer (s) below tuning and could provide you with years more service from your system. Very common crossover frequency. Setting the record level . For stereo users you may leave this setting Off, so you can adjust the Low Pass Filter under the next step. Thanks! My sub with my port had 111db at 15Hz and 116 at 20Hz. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. Ideal power. Come join the discussion about home audio/video, TVs, projectors, screens, receivers, speakers, projects, DIYs, product reviews, accessories, classifieds, and more! I restore older LPs with Audacity, ClickRepair, and my Mitsubishi LT-22 with an AudioTechnica cartridge. Thank you for this Charles! geolemon. I do not have mine set at the moment, and I am afraid that if I do set it I will lose my lowest notes, as my understanding of the filter is that it rolls off everything below where it is set so as not to damage the drivers in a ported box. If you are only running like 200 watts to a sub with 16+ mm of Xmax, you can probably get by with setting it a little lower - just be careful. The value you filter against needs to be the Property Name, not the database column name. I have ported speakers; Ascend Acoustics Sierra 2 EX. It has a cutoff frequency of 18 Hz. Since the Hz setting on the subsonic filter is the start of a slope, not a cutoff, we want to set it higher than 20 Hz. But on low to midrange stuff like the Yamaha RX-V667, is there a subsonic filter on the sub output? But now have a new car, this will take a while to figure out. By clicking Accept All, you consent to the use of ALL the cookies. The phase shift is neglegible. This helps avoid bad distortion since they cant handle deep bass. and I have a light on my amp that turns red when clipping and if that happens I turn the gain down. Meters / Speed of sound (343 m/s in room temperature) * 1000 = time in ms. The proper way to level match your subs is to use the internal pink noise generator of your processor and an SPL meter set for slow response "C-weighted". Usually you want the high pass filter of your components set to the same frequency as you low pass filter of your subwoofer to eliminate phasing caused by the multiple drivers attempting to recreate the same frequencies Ok so 30hz on the subsonic and then on the LP filter start at 80. JavaScript is disabled. Low subsonic frequencies, especially 20 Hz and below, damage the structure, so we want to attenuate them as much as we can. That is exactly what buyers looking at the Vitamix. And tuned @ 20Hz. It is very important that the capacitors C1, C2, C4, C5 and C7 are of exactly the same values in both channels. The blue LED above the button is illuminated when its on. Set it to about 20 Hz. It may not display this or other websites correctly. 1,773 posts. You have seen (and perhaps tried), Robotic collision sensors are crash protection devices that detect a crash before or during a collision. #4. you don't need to run a subsonic filter, if you tune your box correctly. This filter has a very sharp cutoff character. I never do anything close to that with my sub because I don't want to blow it. The sub moves just a little at times and that when I put the system at MAX. Because of the 50db gain high output MC setting, the dial on the front for variable resistance loading is disabled and it defaults to 47Kohm, which is fine for the Denon. February 2016 Somewhere from 50hz to 65hz is likely where you are going to want your crossover set. Building a ported sub using an alpine type R 15inch driver. How do you adjust a subsonic filter? Not a 3" round port. I have a TC Sounds LMS- Ultra 5400 18" subwoofer in a 7.3ft 3 ported enclosure after all displacements. Doing this will enable you to June 2017 Let the user decide what sounds best to them. The tuning frequency acts as a second high-pass barrier, but it does not replace the function of a subsonic filter. This happens independent of the applied recording medium. WebSecondly, a 30Hz tune would put a rule-of-thumb subsonic setting of 22.5Hz. July 2014 You can do all of this from your deck too. But not subsonic filter option. When you purchase through links on our site, we may earn an affiliate commission, which supports our community. A 20Hz high-pass filter (subsonic filter) can be switched in from the front panel to eliminate unwanted subsonics. WebTurn your Subsonic Filter down to 10Hz then slowly turn up the filter frequency until you hear it take effect on your sub bass. For example, If your subsonic filter is set to 40 Hz, 30 Hz notes will still get through but will be much quieter. We also use third-party cookies that help us analyze and understand how you use this website. Adjustable from 0-180 degrees. June 2013 With my IB subs I run 15Hz SS, it hits 20 just fine but I do have to EQ it up with these subs. The proper way to level match your subs is to use the internal pink noise generator of your processor and an SPL meter set for slow response "C-weighted". Electrodynamic "On a long enough timeline, the survival rate of everyone drops to zero." A subsonic filter is a component on your subwoofer that reduces the intensity of notes which come through at lower frequencies. AN ELITE CAFEMEDIA LIFESTYLE PUBLISHER. Pete has been working in the trades since high school, where he first developed a passion for woodworking. Ok. I adjust it because each movie has a different amount of bass so you have to set it up just right. to match the cutoff frequency and damping of any acoustic-suspension speaker and to set the bass boost and net damping. This filter has a very sharp cutoff character. WebInstall the Subsonic server app where you keep your media. You must log in or register to reply here. Bowers & Wilkins LCR 60 S3 Speaker with Kevlar woofers. Use a browser on any computer to play music and movies. If it's a ported box, set the subsonic about 5hZ below the tuning frequency. April 2014 # Highest grade materials used throughout. Combine that with the purely basic frequency response of the amplifier itself and you're starting to get so low that a subsonic is almost unnecessary. This filter has a very sharp cutoff character. JavaScript is disabled. Great information! Would be great to get this added as a sticky or added to a sticky for those who do not search and to have the information more r (anthem arc) But I think I can only set the high pass as low as 20hz thus loosing anything below that.. So in this case the closest setting will be 3ms. It was set to Off so I flipped it to On and the woofer, while slightly moving, was moving dramatically less than when the setting is Off. Well, with the box being not quite the right size for the driver, that's most likely why it never sounds quite right. March 2022 Most subs have a filter built into the plate amp to protect the driver from damage from super low frequencies that it can't produce. The subsonic filter is a High Pass crossover. 3-way speaker systems. Since its tuned at 20hz will that act as a subsonic filter for 10 to 15hz or not at all? What can you say? If it is set to 30 Hz. Intelligent Induction Lamp Review & Teardown. Its the opposite of a low-pass filter, which only attenuates signals above a certain line. December 2019 SEE ALSO: Read our reviews of the best car amplifiers for bass this year, MTX Audio THUNDER1000.1 Thunder Series Car Amplifier, Skar Audio Single 8" 300W Dual 2 Ohm Loaded Sealed Subwoofer Enclosure | IX-1X8D2, 6 DIY Garden Arbor Plans You Can Make Today (With Pictures), How to Install a Pendant Light 12 Easy Tips, 6 Companion Plants for Fruit Trees (With Pictures), Ix Series 8-Inch Dual 2-ohm loaded Subwoofer Enclosure, Peak Power: 300 watts | RMS Power: 150 watts, Subwoofer comes pre-wired and loaded in enclosure. March 2012 . Check the level of each sub independently by turning off all of the other subs not under test. I had my 6-channel amp's opamp and power supply upgraded to better quality parts / grades. But opting out of some of these cookies may affect your browsing experience. December 2012 You using an avr? Learn more OK, I'm convinced Show me the demo first Agree, I see it as over kill,beyond overkill.. and then there is the ON or OFF filter that many amps have..say, set at 28hz(Non adju Just make sure to set the xover on the deck before you turn the xover on the amp to the highest Hz. If it's sealed it can be opened up, low. You can select the subsonic filter frequency (frequency at which you want to begin filtering) and subsonic filter slope (the rate at which you want to attenuate the frequencies)., Receive exclusive offers and promotions. Hi I first like to say great article you wrote! WebEasy way is to leave everything hooked up, subsonic OFF, volume low, play deep bass like 28hz sine wave, turn volume up, as woofers start moving too much turn the subsonic Check out the MTX Audio THUNDER1000.1 Thunder Series Car Amplifier for a great amp with a subsonic filter. The Fora platform includes forum software by XenForo. This category only includes cookies that ensures basic functionalities and security features of the website. For a better experience, please enable JavaScript in your browser before proceeding. My friend always says never use equilisers or add something in the chain of audio. Join the community today and get started. Can you name them? you can build the box so that it does not happen. Where I would part company from you is considering budget constraints. 3.5kHz high pass (tweeter) & 250-500Hz high pass (midrange) Subwoofer subsonic filter. Then I normalize the entire album and export the tracks as AAC. Is using the subsonic filter a must? WebSetting subsonic filter Tech Support I have a 12-in ported subwoofer box, the box is tuned to 31.7. September 2012 Phase adjusting above will shift somewhat with frequency. Yet its not a topic amp owners can blow off. I notice when I play a certain easy-listening RCA Living Stereo album that my woofers are doing a huge dance, moving in and out like crazy, where there is no real bass in the song being played. 07-25-2005 at 10:34am. It can help your amp save power when the bass gets real low. Fascinated by all sort of tools, Pete loves reading and writing about all the latest gadgets and accessories that hit the market. December 2016 Tis sub has a 7.3ft3 box made of 1" MDF tuned @ 20Hz with a slot port that is 16" wide 3" tall x 39". JavaScript is disabled. If it's ported you set it 1/2 octave below the boxes tuning. That could help explain the disparity. You can also buy, sell, or trade your car audio gear with other forum members in our popular classifieds. While filtering is important, this isnt necessarily a dealbreaker; it all depends on what kind of music you listen to. The subsonic filter dampens all frequencies below where you set it so as not to unload your subs if you play a frequency below the port tuning. I wasn't able to find frequency response specs for these, but Subsonic The button on the right side of a front panel turns on and off subsonic filter. I got a couple of anticollision car door warning lights! Anything above 80hz makes the subwoofer easy to locate in the soundstage and you don't want that. The difference in distance in this example is 1 meter. I will definitely take a look at the Nyquist shelf filter. Even among seasoned audiophiles, subsonic filters are a topic guaranteed to sow confusion. VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. With all the detail weve gone into, its easy to forget that most of these changes arent audible to the human ear. You might try this: lCol = objNavigation.Where What Is a Subsonic Filter & Why Should You Care? | House Grail My avr has very advanced room correction. November 2018 Massive output to 18hz ported vs output down to 10hz sealed but not as much output at 18hz and above. Slowly turn the bass boost until a distortion appears then dial it back to a clear sound. However, you may visit "Cookie Settings" to provide a controlled consent. 2. My Sansui integrated had a "subsonic filter" which was labeled 14Hz, so I am used to calling it subsonic (and the OP called it a subsonic filter in the title). Anything below that setting is attenuated (made quieter). All rights reserved. January 2019 A subsonic filter is a component on your subwoofer that reduces the intensity of notes which come through at lower frequencies. It's at 20hz.