subsonic filter setting

I have mine set slightly lower for my sealed box. Ok I have the new 10w6v3 in jl audios ported square box and it fkn pounds but I just need to figure out how to set the sub to get best output. September 2013 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. October 2015 I cant find the SL100B Transistor, of no electrical". If you arent sure which one you have, you can tell by looking at the box. A forum community dedicated to home theater owners and enthusiasts. Magnepan, A SUBSONIC FILTER ISHIGHLY RECOMMENDEDIF YOU SPIN VINYL, USE PORTED SPEAKERS, AND WANT THE VERYBEST PERFORMANCE FROM YOUR ANALOG FRONT-END. This eliminates the bizarre subsonic sine wave almost all LPs have. 4. A subsonic filter is mostly used in low frequency technology. 5. 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. Meters / Speed of sound (343 m/s in room temperature) * 1000 = time in ms. Thanks for the responses, I guess I'll continue doing it by ear then. If 30hz seems too low, you can bring it up some. That one takes some listening to get dialed in. First the subsonic filter. What should my subsonic be set at? The typical Tschebyscheff resonance of 0.1 dB does not cause any distortion. If yes, you have a sealed enclosure. March 2014 Thanks for reading, and as always, feel free to sound off in the comments below. Therefore, to get your subsonic filter setting, take your subwoofers tuned frequency and multiply it by 0.75. I wasn't able to find frequency response specs for these, but 2-way speaker systems. Report Comment. I restore older LPs with Audacity, ClickRepair, and my Mitsubishi LT-22 with an AudioTechnica cartridge. For a better experience, please enable JavaScript in your browser before proceeding. Where I would part company from you is considering budget constraints. The Subsonic is now correctly set. Set the LPF at 60-80 Hz. For visual learners, the video below illustrates how low frequencies can distort a subwoofers cone alignment without a filter. There was a lot of drone in that 60-80 Hz range. For the crossover. I had my 6-channel amp's opamp and power supply upgraded to better quality parts / grades. And what's your buddy's vehicle? For the crossover. (anthem arc) But I think I can only set the high pass as low as 20hz thus loosing anything below that.. Hi. The push button turns on and off subsonic filter . Of course, can always adjust for an anomaly track. It's not always necessary but it really depends on the enclosure, subs, power, and what you listen to. Were here to help. Delete. For example, If your subsonic filter is set to 40 Hz, 30 Hz notes will still get through but will be much quieter. I have a totally restored Nikko Alpha II amp and a Nikko Beta 20 Pre Amp. So thanks for taking your time to explain to us relatively few people who care about such thing! If it's sealed it can be opened up, low. Edit. The current consumption is aound 5 mA. All contents are Copyright 2023 by AspenCore, Inc. All Rights Reserved. I flipped it on and off multiple times just to confirm my observations. Hook up all four readers to the bus, and "talk" to the", "Update: I just found a great post that also explains more about the pressure sensor used in this", "Hey Dear:- Especially on some ported subs. 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. Sign up to newsletter and stay in touch with us, Copyright 2015-2023 Arendal Sound - All rights reserved, 5% Ambassador refund for existing Ambassadors. WebSetting subsonic filter Tech Support I have a 12-in ported subwoofer box, the box is tuned to 31.7. His other interests include astronomy, hiking, and fishing. The subsonic filter is a High Pass crossover. It may not display this or other websites correctly. If you are trying to find 65hz, just start cutting things in half. "On a long enough timeline, the survival rate of everyone drops to zero.". Your approach to adjusting your subsonic filter depends most heavily on whether your subwoofer is set in a sealed or ported enclosure. We recommend this setting for smaller rooms and/or to get a faster, more musical and punchy sounding bass. (are you certain the box is tuned to 30 hz?). Note that my January 2023 Your favorite music genres will push the limits of the low end. If it's ported you set it 1/2 octave below the boxes tuning. If there was such a receiver with this subsonic filter built in they would be using it. This filter has a very sharp cutoff character. Frequencies blow 10 Hz are attenuated by more than 35 dB. 3 modes for sealed subwoofers, 6 modes for vented subwoofers as they can be used in vented or sealed mode. November 2015 Home Trials The Fora platform includes forum software by XenForo. If youre a true bass-head, you might be incensed at the idea that youd want to cut out subsonic frequencies. February 2023 Set it and listen. WebInstall the Subsonic server app where you keep your media. Thank you for this Charles! Subsonic notes sound awesome, but they damage your hardware when they get out of control. "Let our rigorous testing and reviews be your guidelines to A/V equipment not marketing slogans", Get our latest product reviews and AV stories emailed to you weekly. October 2020 | House Grail I setup my sub one time and have not touched it once since then (EQ'ed though). I think this is a large generalization as every install(box, subs, power level, design, vehicle, etc) is different. It's one of those "rule of thum When you purchase through links on our site, we may earn an affiliate commission, which supports our community. April 2016 Copyright 2023 House Grail. The subsonic filter is actually an active Tschebyscheff high pass filter of the fifth order. Any help on this is greately appreciated. It may not display this or other websites correctly. WebTurn your Subsonic Filter down to 10Hz then slowly turn up the filter frequency until you hear it take effect on your sub bass. Selectable from 12 Hz to 31 Hz. bad contacts- main source of miracles in electricity. 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.. I just finished up with the rebuild of my system (see sig) last weekend and when I was setting the dials on my sub amp before powering it up I set my subsonic filter to what I thought was around 20Hz. As only frequencies You're not going to blow up your car playing below tuning. Just don't be reckless with it. SSF @ 25hz is fine. Well, with the box being not quite the right size for the driver, that's most likely why it never sounds quite right. Adjustable from 0-180 degrees. I keep them off if in a sealed 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. House Grail is reader-supported. Setting the Subsonic Filter and Bass Boots. March 2016 March 2012 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. EDIT 2: Ah, and you dont need your woofer connected to do that 8 Reply blockrocker 3 yr. ago Yes, do this. Thats where all the bone-shaking, window-rattling fun is! A collision, Turbidity is considered a good measure of the quality of water as it is a measurement of how. A subsonic filter is a component on your subwoofer that reduces the intensity of notes which come through at lower frequencies. Webfactory setting will suit you fine. Too many subsonic notes can still damage your subwoofer. Thanks for the replys. Most all multichannel receivers have bass management. 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! Since this is fairly limited to an artifact associated with vinyl playback, is there any value to having this setting On while listening to digital playback? You using an avr? Use WinISD to help you make proper sub and amp selections according to your listening tastes. Pioneer 880PRS~boston comps/alpine coax on Kappa 4 Z~back to Alpine mrd-m500 v12 on pyle 15s IB. In your case your filter goes to 35 so that's what you use. Let the user decide what sounds best to them. 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. Selectable subsonic filter settings, that will filter away the deepest frequencies. April 2015 Hi. EQ1 Gives a flat ground plane response to under 20 Hz, which will give great emphasis on the deepest bass in-room. So if you have a SUBwoofer in your I understand that high end gear might contain a subsonic filter option etc.. The Fora platform includes forum software by XenForo. I also always keep my Bass and Treble to 12:00 -Off. The low pass can start anywhere above the low pass frequency of the It has a cutoff frequency of 18 Hz. Phase adjusting above will shift somewhat with frequency. The best thing to do is listen. Slowly turn the bass boost until a distortion appears then dial it back to a clear sound. Play some of your favorite bass-heavy tracks and adjust the filter threshold until the low notes start reverberating. First the subsonic filter. February 2012, All The Fora platform includes forum software by XenForo. As a very general rule of thumb, I usually set an infrasonic filter 1/3 octave below tuning frequency. 20-30Hz high pass. 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. 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. We recommend leaving the phase at 0 degrees when using an AV-Receiver/Processor with time alignment (speaker distance) feature. I have a TC Sounds LMS- Ultra 5400 18" subwoofer in a 7.3ft 3 ported enclosure after all displacements. Electrodynamic "On a long enough timeline, the survival rate of everyone drops to zero." You can select the In your case the 10w6 I wouldnt go lower then 26-28hz on the test tone. Its the opposite of a low-pass filter, which only attenuates signals above a certain line. Pete has been working in the trades since high school, where he first developed a passion for woodworking. 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. (anthem arc) But I think I can only set the high pass as low as 20hz thus loosing anything below that.. Use a browser on any computer to play music and movies. 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. If On is selected, then the Low Pass Filter will be disabled. However, you may visit "Cookie Settings" to provide a controlled consent. Fascinated by all sort of tools, Pete loves reading and writing about all the latest gadgets and accessories that hit the market. 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. that goes for both sealed and vented. Show more Show Regrettably, the motor is running at a constant", "What changes are required in order to feed audio instead of microphone", "Author's Note: More information about the AZDM01 turbidity sensor used in this project can be found", "i looked at some of the circuits at this site and found them to be Anything below that setting is attenuated (made quieter). 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. March 2022 Verify the level equidistant for each sub. Subsonic Filter Selectable subsonic filter settings, that will filter away the deepest frequencies. Each octave up is twice as many Hz as the previous one, and dividing any frequency by 2 takes it one octave lower. 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. So I decided to search the Internet and found your write-up confirming my experience. Frequencies blow 10 Hz are attenuated by more than 35 dB. Too many deep bass thuds can tax the limits of your woofer and cause it to wear out much faster than it otherwise would. I got a couple of anticollision car door warning lights! Enjoy your next ride with your newly balanced bass track! My port is 16" wide x 3" high and 39" long. These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. Or is there at least a subsonic limit to the LFE channel bandwidth? October 2013 Now when I use my subsonic filter my sub moves much less but!It's been 1 year I'm debating if I should use this filter because Im pretty sure my system sounds better with the filter off. 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. You might try this: lCol = objNavigation.Where WebSetting computer to higher frequency (352,8kHz or 384kHz) deactivate S/PDIF Out and allows to record in DSD128 format. 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 Update Privacy Preferences I remember watching my woofers move in and out (large excursions) without making a sound. 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. 3.5kHz high pass (tweeter) & 250-500Hz high pass (midrange) Subwoofer subsonic filter. For a better experience, please enable JavaScript in your browser before proceeding. Were right there with you. could you suggest me an equivalent", "I found a lot of circuits that are very similar to this one and constructed one but for some reason", "hi can you pls mail me your pcb layout ,", "I have tried the same circuit for my AC motor. Deals Selected value is indicated by LED. Where you set your SSF will be somewhat dependant on how much power you are running, how large your enclosure is, and how much Xmax your driver has. For a better experience, please enable JavaScript in your browser before proceeding. They're right- the answer is No. Right, or play tones lower and lower and when it unloads For stereo users you may leave this setting Off, so you can adjust the Low Pass Filter under the next step. For a better experience, please enable JavaScript in your browser before proceeding. I'm down at 60 Hz and found that with the music that I listen to it sounds much better. You can do all of this from your deck too. 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. Webedited December 2003. So, if its tuned to 40 Hz, set the filter knob to 30 Hz. March 2017 Do it in the avr when I do, but it's rare I need more (or less). Most often, the very low frequencies create distorsions in music recording or reproduction. What is this? What high end receivers are you talking about with a subsonic filter? Doesn't sound like it if you are constantly adjusting. geolemon. To remove this unwanted low frequencies, subsonic filters like the circuit featured here is used. Thanks for your advise on this topic. 11. # Highest grade materials used throughout. It Yes, every single recording is different, but adjusting to each film should still not be necessary (I agree that it isn't perfect all the time). As far as LPF, it's almost the opposite of a subsonic. I have never heard of this. 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. (frequency always indicated by corresponding LEDs). The Low Pass Frequency is adjustable from 30 Hz to 160 Hz in 1 Hz increments. Its the opposite of a low-pass filter, which only attenuates signals above a certain line. Possible settings are 40, 43, 50, 53, 60 and 63dB. Pro tip; Have a friend/wife/mom help adjusting the phase while you sit in your listening position. My avr has very advanced room correction. 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 Setting the record level . 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. So it's so hard to tell if it's better. A 20Hz high-pass filter (subsonic filter) can be switched in from the front panel to eliminate unwanted subsonics. A round port is 3" x 3". Adding the subsonic filter will ensure the subwoofer has less excursion in the deepest bass, and typically when filtering away some of the deepest bass it will sound even tighter. An electric arc lighter uses high voltage, I recently picked up a couple of microwave motion sensor radar modules. Thats a great way to find that balance we talked about above. 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. Sealed enclosures work just like weve described. Check the level of each sub independently by turning off all of the other subs not under test. You set it just under where the mid bass speakers pick up. My speakers have an in-room low extension -3dBs at 32 hz so I don't want to miss out on real bass reproduction. I rarely touch sub levels. Explaining that is beyond the scope of this Q&A, but if youre just now learning, you should tune your subs, and this video is a great explainer. Ok. 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). What I wanted to say is that amps sound the same. It's not at all clear to me what you are talking about? basically, if you tune the box higher, and/or you will gain some spl, but excursion increases below the roll-off. What vehicle is this? After listening to a few songs I realized that it wasn't getting as low as it should considering my box is tuned to 30Hz and my xover is set to 100Hz so I turned down the SS filter a little more and it sounded alot better. # New armtube incorporating bi-metalic technology to reduce resonance and increase rigidity. June 2017 # Low friction, completely stable dual pivot bearing design for vertical movement. I don't know what to say..to me 10Hz IS subsonic. (To learn more about frequencies and how they work, check out our Beginners Guide to Frequency Ranges.). 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. You can set the subsonic filter on your 1723 Series Subwoofers in the Crossover Menu and for the 1961 Subwoofers in the Setup Menu. Not a 3" round port. So the question is. How to set a subsonic filter on a subwoofer? April 2022 September 2015 When simply playing records, I use my Sansui AU-517 integrated amps subsonic 16hz filter always. Great advice with the test tone. Some people own amps with subsonic filter buttons that they never turn off for fear of breaking something. The frequencies below the crossover are sent to the subwoofer. It is very important that the capacitors C1, C2, C4, C5 and C7 are of exactly the same values in both channels. The sweet spot for getting some pounding bass without destroying your subwoofer is between 25 Hz and 35 Hz. http://www.klippel.de/download/Nonlin/Klippel_nonlinearity_poster.jpg, Advanced Forum Stats, Paid Registrations by. Its not important to understand exactly how theyre wired. It is adjustable 6dB/Oct or 12dB/Oct. Weve now covered the purpose of a subsonic filter and how it works. My remaining question is should I leave this setting on while either listening to CD's or watching TV/movies? You'll find everything you want to know about car audio and get installation help, tips and great deals on your car stereo projects. AN ELITE CAFEMEDIA LIFESTYLE PUBLISHER. I actually go into the movie if its an action movie and set the bass to match some explosions and then watch the movie so I don't have to change it during the movie. For movies this can be especially appealing. A forum community dedicated to all mobile audio enthusiasts. August 2014 Since its tuned at 20hz will that act as a subsonic filter for 10 to 15hz or not at all? The trick is to find the right balance; it should be loud enough that you can feel the bass but attenuated enough that its not destroying your amp. May 2012 OK, so if the port tuning frequency is 40Hz then your subsonic should be set to 40Hz which is pretty high. My new ones should be better. Somewhere from 50hz to 65hz is likely where you are going to want your crossover set. This discussion. 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 Anything above 80hz makes the subwoofer easy to locate in the soundstage and you don't want that. Our Q&A covers all the big questions you might have about subsonic filters. The blue LED above the button is illuminated when its on. Your subsonic filter should be set at 30.12hz, which is the max free air response of the driver. June 2012 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. These warps can produce frequencies well below 20Hz and can introduce distortion into your playback system. This filter has a very sharp cutoff character. If you pay attention, you will find that when it comes, The intelligent induction lamp is a cheap indoor motion sensor nightlight that comes in handy so you do, This post covers a few things about rechargeable electric arc lighters. other than a high pass filter set to 80hz. 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 I have a light on my amp that turns red when clipping and if that happens I turn the gain down. For Home Cinema use, where an AVR is used we recommend LPF Bypass On. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. "Maybe you could further investigate programming this module through its serial port. Verify the level equidistant for each sub. As a very general rule of thumb, I usually set an infrasonic filter 1/3 octave below tuning frequency. We recommend you try the factory setting first. Copy Comment URL. Since you are tuned to 35hz, you can set the filter around 30hz to 35hz. On the flip side, I think it's a good place to start. If you're just guessing as to what frequency to set it at. On top of that you're guessing whe 07-25-2005 at 10:34am. For a better experience, please enable JavaScript in your browser before proceeding. If your subsonic filter is set to 40 Hz or 30 Hz, notes will still get through but will be much quieter. December 2018 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". With all the detail weve gone into, its easy to forget that most of these changes arent audible to the human ear. June 2016 Then I normalize the entire album and export the tracks as AAC. Originally a subsonic filter was designed to catch recording errors and frequencies below 20hz hence "subsonic" that could possibly damage your subs. You are using an out of date browser. to match the cutoff frequency and damping of any acoustic-suspension speaker and to set the bass boost and net damping. JavaScript is disabled. 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. But opting out of some of these cookies may affect your browsing experience. It will also help reduce low frequency rumble and sounds from the listening environment. Tbone, the JBL amp has it's own low-pass filter built into the amp. 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. Support the12volt.com Back to Top bullseye753 Copper - Posts: 61 Joined: May 27, 2008 Location: North Carolina, United States April 2014 August 2012 December 2019 April 2012 Feature highlights. I feel like with it on it gives a little less clarity and affects the highs a little less air,space. 2. 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. You are using an out of date browser. It decreases the amplitude of those low notes you feel more than you hear. November 2018 VerticalScope Inc., 111 Peter Street, Suite 600, Toronto, Ontario, M5V 2H1, Canada. Its tuned at 20hz. Check out the MTX Audio THUNDER1000.1 Thunder Series Car Amplifier for a great amp with a subsonic filter. Especially on some ported subs. Is using the subsonic filter a must? When you purchase through links on our site, we may earn an affiliate commission, which supports our community. 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. Building a ported sub using an alpine type R 15inch driver. Feet / Speed of sound (1125 f/s in room temperature) * 1000 = time in ms. Adjustable from 0 to 50ms in 0.25ms increments. May 2014 You are correct in the presumption that subsonic filters provide a level of protection from over excursion. The Subsonic filter slope means at which rate the frequencies should be tapering off, from the frequency point chosen. For the LP I would play with that crossover a little, most think that the you should just set it to 80 Hz and leave it. August 2013 Over the years, he has developed a keen interest in a wide variety of DIY projects around the home. Any difference could cause noticeable phase shift in the output signal. 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 The best way I've found to set a SSF is to generate a sweep from 45 down to 10hz, about 60 seconds long, turn the subsonic up, then let that sweep 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. November 2012 Think of the filter as a slope, not an on-off switch. It has a cutoff frequency of 18 Hz. These cookies do not store any personal information. I also have a vintage McIntosh 2200 amplifier which is a 20hz to 20kHz amp. The maximum useful frequency is 3 MHz. March 2015 LPF covers the top end. A subsonic filter is a component on your subwoofer that reduces the intensity of notes which come through at lower frequencies. Owner Stereo Integrity Co-owner Obsidian Car Audio Associate Sundown Audio But if you understand how to adjust your subsonic filter and practice doing it right, you might reap some big rewards. Your subsonic filter should be set at 30.12hz, which is the max free air response of the driver. The typical Tschebyscheff resonance of 0.1 dB does not cause any distortion. A very difficult decision. Not only will your low-frequency sound be less distorted, but your expensive subs will also last much longer. February 2017 it will attempt to quieten the notes that are below that frequency. Set it and listen. How do you adjust a subsonic filter? It decreases the amplitude of those low notes that you feel more than you hear. its an older pioneer AVR and yes it has a room eq setup feature with a mic. If you have a ported box I would definatley keep the subsonic at 30 Hz. Doing this will enable you to Resolution was greatly improved with excellent transparency. In connecting the subsonic fiter, remove the decoupling capacitor from the end module to avoid distorting the signal. Selectable from 12 Hz to 31 Hz. Hi I first like to say great article you wrote! But now have a new car, this will take a while to figure out. The hertz scale is logarithmic. On/Off. 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. December 2012 December 2013 Web20 Hz subsonic filter. If not, its ported. That could help explain the disparity. 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.

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