Sealed Speaker Box Design


Re: 6X9 car speakers enclosure volumes I have used a few different 6x9's through the years - plentiful and inexpensive. Online speaker building calculators by Hi-Fi Speaker Design. This tutorial will explain the steps used to calculate the internal volume of a speaker enclosure. Subwoofers in a ported enclosure are a bit more reliable and will last longer than they would in a sealed box simply because they run cooler. The subwoofer box design acts as a filter, cutting off lower frequencies. Buy high quality Car Subwoofer boxes, truck subwoofer boxes, subwoofer specific box enclosures, Hydrographics Kits, Atv Utv Speaker Pods, Amplifiers, Batteries and more audio related products at ATRENDUSA. Hatchback I could go either way, space would be my main concern. For example; here is what I'm working on for my truck at the moment. A sealed design allows a subwoofer to exhibit lower group delay, which is a measure of how fast the acoustic phase of the system changes. Shown below are some pictures of quarter wavelength loudspeaker designs that people have built. I'm not absolutely sure about the current models. What is the difference between sealed and ported speaker boxes? Whether your 6x9 speaker boxes are sealed or ported gives you a different musical sound quality from the other. Voice Coil Impedance: 4 Ohm. Baths & Circulators. The infinite baffle speaker system is basically a closed box or cabinet. Everything for your DIY speaker build. For the sealed design, only 10 liters for a Q of. An inch or so is entirely adequate thickness. Subwoofer Box Enclosure Tuning Frequency Calculators: Enter value, select unit and click on calculate. sealed vs ported - courtesy of dummies. 0: Vented, Sealed and Bandpass speaker enclosure design. Sealed boxes choke 40-60% of output compared to a ported box. WinISD recommends a 1. It's not even worth trying without having the specs, and then, each cabinet design has its own formula. BOX PLANS BOX PLANS PRODUCT SUPPORT SYSTEM SETUP ASISTENCIA TÉCNICA COMPACT SIZE BOX PLANS The Compact Box Recommendation is for when a DD user has limited space, due to physical dimension limitations. Enclosures may range in design from simple, homemade DIY rectangular particleboard boxes to very complex, expensive computer-designed hi-fi. ) No speaker design is inherently inferior to any other. Updated daily | Sealed Subwoofer Box Plans. Water Baths. 5" to 18", different blueprints are available and pretty easy to download!. LDS 2-15", 2-6" Sealed vintage style cabinet [email protected] This enclosure has been tested by Atrend as well as Digital Designs to ensure its compatibility with DD Woofers. Whether you're building new cabinets for you band or your business, the basics of cabinet design remains the same. The biggest advantage is the enclosure requirement for this style is half of the size of the recommended sealed enclosure for the speaker. I'm sure the mids and highs are sealed. Which absorbs the rearward sound wave. This design isn't best suited for shallow subs, simply because it would impact the sub's tightness. 312 cubic feet. In doing this, the pressure from the box helps to restrict vibrations. Each sub has a recommended box type and size. Ultimately I built the sealed box design because I wanted the subwoofers to have some remote chance of being as "fast. All other enclosures will work for remaining Digital Design Subwoofers. There remain a number of challenges to overcome before a similar approach is available for building enclosure design. This means you can get great bass out of a very small space. This sealed enclosure is the best subwoofer box design for deep bass. We offer free fast shipping, a 90 day money back guarantee including return shipping, as well as a full warranty. Focal Polyglass subwoofer box enclosure design plans 27V1, 33V1, 40V1. Every speaker has a range of frequencies that it can produce -- some easier than others. The 12" woofer cone and large voice coil work together for remarkable realism, note-perfect accuracy, and sustained bass response. It's a very highly rated, free program for Windows. We must remember. The crisp sound is a result of the air inside the enclosure acting like a shock absorber. Front-loaded Horn Comment: primarily applicable to mid/high frequencies. Here are different types of subwoofer box designs: Sealed Box Enclosures: For Deep, Accurate Bass; A sealed enclosure is a compact, airtight box housing your subwoofer. The demo version includes the information for the Eminence Sigma Pro-18 woofer. It will sound like a drum skin. Shop Metra 6" x 9" Single Sealed Speaker Enclosure (Pair) Charcoal at Best Buy. Loudspeaker Design Tradeoffs by John L. They require less wattage than the sealed boxes. A loudspeaker enclosure or loudspeaker cabinet is an enclosure (often box-shaped) in which speaker drivers (e. With all the shaking that speaker drivers do, …. 5" x 24 " x 10 ". 707 value for Qtc for a smooth roll-off at the low end. Speaker Cabinet Design Software. For the sealed design, only 10 liters for a Q of. It is all about the bass. Sealed boxes are like running a restrictor plate on your subs. Thicker less resonant walls, or internal bracing, or higher density mater. Calculate for Box Enclosure Tuning. A Folded Horn Enclosure To Make The Most Out Of A Subwoofer. Subwoofer Enclosures Enclosure Types is a sealed enclosure with the additon of a port tuned to a specific frequency. Rectangle sealed enclosure volume calculator. Eminence Designer is a bass speaker design program. In my DIY speaker building projects of the past, I had a tendency to stop as soon as the speakers made sound, resulting in such things as speakers with basketball backboard markings on the sides!. Any speaker will produce sound in any cabinet, but optimizing the relationship between the speaker and the enclosure is the key to good bass. Construction Notes on Speaker Box Design: Notice the ¾" inch gap (or void) on the speaker box design plans between the upper chamber and lower bass chamber. As far as one being better than the other I'd take a well designed bandpass over a sealed any day in a trunk car. It is better than other box calculation software because it also considers approximate cabin gain, power compression, port compression and other non-linearity. Designed for forceful bass. Outrageous Audio Speaker Box Design Explained Vented or Sealed - Duration: 17:58. JL AUDIO ACS110LG-TW1 Powered Shallow Subwoofer Sealed 10TW1 PowerWedge+ Sub Box - $519. In the front of these enclosures is a hole (port) that equalizes pressure between the inside and outside of the speaker. SEALED SUBWOOFER ENCLOSURES. Dayton SA1000 Subwoofer Amplifier A truly fine subwoofer amplifier. Subwoofer Box Enclosure Tuning Frequency Calculators: Enter value, select unit and click on calculate. Basically, a passive radiator is a reactionary device as the name suggests. Vehicle interiors have limited space, so we started our research on making the most bass energy from a specific amount of space. FREE Shipping by Amazon. Which absorbs the rearward sound wave. Not only will the box fit the perfect size of your vehicle and subwoofer, but weguarantee a higher audio quality and overall experience as well. SVS sells high end sealed & powered subwoofers here. Comment: primarily applicable to subwoofer design. Accurate enclosure volume calculations are essential for proper subwoofer system design. Sealed boxes are like running a restrictor plate on your subs. Team Sundown Audio, Team XS Power, 2 time NSPL Car 3601-Up. The colors of the curves in the diagrams for frequency response, step response, group delay and voice-coil impedance have the following meaning:. The ultra compact S1512 powered home audio subwoofer leads the pack with deeper extension, more thunderous output, and better overall sound quality. Tuning frequency at 32HZ. Ultimately I built the sealed box design because I wanted the subwoofers to have some remote chance of being as "fast. In a bass-reflex enclosure, the amount of acoustic. Designing speakers is a juggling act, says ELAC’s Andrew Jones. Make this correction to the Vas parameter you enter before calculating your results. Front-loaded Horn Comment: primarily applicable to mid/high frequencies. The result was a set of performance curves and the enclosure design details. I also mentioned "…room-shaking bass - below 20 Hz - from a cabinet too small to have a vent or passive radiator required for a vented system. These were some of the best subwoofer box designs on the market. The simplest type of subwoofer to design and construct, sealed subwoofers consist of a driver, an enclosure, and an amplifier; the driver is responsible for 100% of the system's output. Every speaker has a range of frequencies that it can produce -- some easier than others. 5" to 18", different blueprints are available and pretty easy to download!. Download AJ Sealed Designer - Utility that provides an easy to use interface to solve sealed box parameters. There are designs for sealed/ ported boxes in single/dual speakers & subwoofers. The smaller a sealed box is, the higher the frequency the sub will play, and the more power it will handle. We've worked with JBL, Pioneer, & Best Buy just to name a few. A properly designed enclosure cannot make a poorly designed loudspeaker operate satisfactorily. Ported Subwoofer Enclosures in Pro Audio I'm not a speaker guru myself, but I've build some boxes and listened to a lot of different systems over the years. When the speaker cone vibrates, it is moving in and out of the box, and this changes the box volume (slightly). Notice how the brace ties the top of the box to the bottom of the. Now the hard part designing the actual enclosure. Conversely, a woofer in a vented enclosure will tend to keep moving after the drive signal has stopped, as shown in Fig. This will be a simple rectangular box. Here are different types of subwoofer box designs: Sealed Box Enclosures: For Deep, Accurate Bass; A sealed enclosure is a compact, airtight box housing your subwoofer. Ported woofer box. This goal set me on a journey from which the L-07 is an early example. I'm not absolutely sure about the current models. The next thing you're going to inevitably want to investigate is speaker cabinet design software. Such a geometry includes the box and the ports -if any- as well. The Subwoofer Designer Series is intended for the hobbyist, audio / acoustic enthusiast and Do It Yourself (DIY) speaker builder. Eminence Designer is a bass speaker design program. Instead, use an up to date technology like Direct Servo or Linkwitz Transform (LT). The innovative shape of the enclosure is designed for high rigidity and to reduce internal standing waves while also increasing installation flexibility. The NHT speakers are sealed-box acoustic suspension design. The Lirio Building, a planned 112-unit project offering affordable housing in Hell?s Kitchen in Manhattan, is one of many new passive house high-rises going up across the country. 0 cube sealed enclosure. I also have their biggest (but discontinued) subwoofer. When the diaphragm moves back into the speaker, it increases the internal pressure, which is funneled out through the front port of the speaker. Sealed boxes: For deep, precise bass. For more on sealed enclosure design, see the Sealed Box Subwoofer Design page. This pressure difference exerts a force on the driver, that pushes it back towards it's resting position. Call us at 888. Its overall performance envelope that puts it right at the top of its price class. Conclusion. Subwoofer Box Comparison Calculator: Compare bandpass, sealed and vented frequency output graphs for a subwoofer in one program. 99 (4-5 days) Only 2 left in stock - order soon. This means you can get great bass out of a very small space. The graphic display is intended as a way to visualize some of the proportions as you manipulate the size of the box. Free shipping on many items Rockville RD65 Dual Sealed 6. The subwoofer enclosure you build has to not only meet the volume requirement for your speaker, but be crafted in a way to make it fit your car. Enclosures ending in "2" identifies enclosures that work for 3000, 3500, 9500 & 9900 Series Subwoofers. When the diaphragm moves back into the speaker, it increases the internal pressure, which is funneled out through the front port of the speaker. HT-Audio's BASSBOX Pro/Lite Software. A driver with a particular mix of T-S Parameters should be capable of deep bass in a relatively small box. They are speakers that are embedded in a sealed box. Subwoofer Boxes & Enclosures. Understand the pro's and con's of different enclosure types. Free shipping and free returns on eligible items. Raven Point Source And Focal 6W4311B. We'll achieve this by using 3/4 " MDF for the enclosure with external dimensions of 15. You are likely to end up with a successful speaker box design project. Build your own box and enjoy the legendary Kicker sound! How to Build a Subwoofer Box | KICKER® See more. Shop BestBuy. Pick one that you prefer more. Ported will work better if you want a booming sound. Design bass reflex speaker enclosures. So, a rhetorical sub in a sealed box that has an F3of 56 hz would start dropping off 3 db at 56hz, and the same sub in a vented box with an F3 of 37hz drops off 3db @ 37hz. Designed for forceful bass. Easy and convenient build your box. pdf (7725 Views, Box, Design, Subwoofer, Type-R, Type-S, What Alpine amplifier do you recommend with my Alpine subwoofer/subwoofers?. 33 ft^3 when ported. Each Q-Forms panel is custom designed to be a replacement for the factory panel in your car, truck, or SUV. construction techniques - final assembly - detailing and finish work - building grilles. 40 are better suited for ported sub woofer boxes. The graphic display is intended as a way to visualize some of the proportions as you manipulate the size of the box. Calculating box volume for a sealed box requires Vas, Fs, & Qts. Expect flat response (not excessively boomy), deep bass extension, and excellent power handling. The basic two-speaker box designs are sealed and vented. I also have their biggest (but discontinued) subwoofer. Likewise, speaker drivers are often designed for specific enclosure types--roughly speaking, a speaker with a loose compliance does best in a sealed cabinet, where stiffer suspensions work well in vented or transmission line systems. All other enclosures will work for remaining Digital Design Subwoofers. Boxes, and APO addresses is not available for this item. You’ve already selected those superb-sounding speakers for your vehicle's audio system and now you are on the market for Jeep Wrangler subwoofer boxes & enclosures? Don’t worry a bit, you are already at the right place to do all of your shopping. a ported box is usually about +3dB more efficient at the frequency of the tuned port(s). The formulas used in the calculator create a design that suggests the most maximally flat response in an anechoic environment based on the number of drivers, the thiele small parameters and the allotted dimensions specified in the user’s input fields. | Courtesy CetraRuddy Passive house high-rises provide cleaner air, lower utility costs, and an affordable option for tenants When Sendero Verde, a 100-percent affordable apartment development in East Harlem in New. We will use the standard. Make a subwoofer enclosure plan. Ported speaker is the roll off. NEW Outdoor Marine Speakers AXIS 50Watt 2-Way Quality. Outrageous Audio 140,801 views. Single Vs Dual Box Design: A single subwoofer box design is meant to offer great sound quality while a dual box design is designed to produce higher sound output. Each speaker has its own sealed box within this cloud (see diagram below). This sealed enclosure is the best subwoofer box design for deep bass. 5" MDF Subwoofer Box Enclosure 0. , this design is quite similar to its sealed box configuration. 6333 for assistance or search through our e-commerce store!. The back of the speaker is completely sealed off. 10" Shallow Mount Sealed Enclosure with Built-in Amplifier. And the hardest part of all securing the funds for something. Sound Quality. This refers simply to which side of the speaker the horn is attached to, since sound waves come out of both sides of a cone speaker. 50 (8 Reviews) Part # 260-648 Qty. Fs becomes more complicated with a ported box. You can choose from single, dual, and triple slot subwoofer enclosures to house your subs. What a sealed sub rarely does is roar, thunder, or boom. Methods of determining an existing enclosure's volume will be discussed as well as methods used to design a box to a given target volume. 0: Vented, Sealed and Bandpass speaker enclosure design. calc,, which is for optimizing bessel speaker systems. It is all about the bass. Depending on the type of subs you have, the sub enclosure can make or break your audio system. Which means all of our products are made in America with great attention to detail, precision, and quality. Design Your Own Reference Bookshelf Speakers: A few months back, I went into a big box consumer electronics store and wandered back to the elite section. Ported woofer box. To calculate the speaker box volume, we will use the Speaker Box Designer. Murphy Physicist/Audio Engineer. Home; Products. Speaker Enclosures Designed to reduce the free-cone problems of cancellation and resonance Also referred to as "baffles" or "cabinets" Several types: two of the most common are the "sealed" enclosure and the "bass-reflex" enclosure. Empirical testing has shown that completely stuffing a sealed box will effectively make the box acoustically larger by changing the box operating mode from adiabatic to isothermal. The sealed design will never play as low as the resonant frequency of the speaker. That's because a sealed sub has very flat frequency response and tends to play tight, full bass that provides a level low-frequency foundation to your music. It has enough controls that integrating it into a system should be straight forward. The formulas used in the calculator create a design that suggests the most maximally flat response in an anechoic environment based on the number of drivers, the thiele small parameters and the allotted dimensions specified in the user's input fields. Call For Details. The demo version includes the information for the Eminence Sigma Pro-18 woofer. Price Match Guarantee. The main difference accoustically between a Sealed vs. 55 cubic foot box for our sealed enclosure. JL AUDIO ACS110LG-TW1 Powered Shallow Subwoofer Sealed 10TW1 PowerWedge+ Sub Box - $519. It will sound like a drum skin. 5" to 18", different blueprints are available and pretty easy to download!. With all the shaking that speaker drivers do, …. it's not that expensive for a prefab MDF box these. A well-built and braced speaker enclosure design can make a huge improvement over a thin, flimsy, and lightweight speaker box or subwoofer design. after much to and fro with ported designs we changed the low bass box design to a bit larger but SEALED enclosure , the measured numbers were about the same ( very) close but omg the difference to how the wavefront "hits you in the chest" was massive. How to make custom sealed subwoofer enclosure without fibreglass. The sealed (aka: air-suspension, acoustic-suspension) enclosure is a classic box design. Calculate the box volume and tuning. A sealed box is an airtight enclosure housing your subwoofer. Box Design ported vs sealed & what Hz? Hi All, I'm getting some equipment delivered in a few days time. These applications are focused on a single cabinet providing a 15 or…. Transmission lines and sealed boxes have a 12dB per octave roll off after the resonant frequency, while a vented box has a 24dB per octave roll off. HT-Audio's BASSBOX Pro/Lite Software. There are three types of enclosures shown in Figure 1 that are commonly designed: sealed, ported, and bandpass [1]. The simplest of all loudspeaker designs, the sealed enclosure system consists of a driver mounted on one side of a sealed box. These were some of the best subwoofer box designs on the market. Acoustic suspension (air suspension or sealed box) is a method of loudspeaker cabinet design and utilisation that uses one or more loudspeaker drivers mounted in a sealed box or cabinet. 0 is only $25. The vented enclosure—or ported enclosure—is a more efficient choice. There are designs for sealed/ ported boxes in single/dual speakers & subwoofers. Bass Roll-off. Free Access. There aren't really too many drawbacks to a sealed box. The basic two-speaker box designs are sealed and vented. This tutorial will explain the steps used to calculate the internal volume of a speaker enclosure. Free Air covered too. The JBL Flip 4 is older now, but that doesn’t mean that it’s outdated. Sealed (or closed) enclosures. Sealed Empty Bass Boxes: This option is perfect for those that have their subwoofer picked out and want to just pair it with a readily available and made bass box. Sealed Subwoofer Boxes If you listen to music that requires clarity and sounds better with tight and accurate bass then a Sealed Subwoofer Box is what you're looking for. Get the best deals on 6. 707, is required or 33% smaller than the Triune enclosure of the same Q. Re: 6X9 car speakers enclosure volumes I have used a few different 6x9's through the years - plentiful and inexpensive. Please enter your information below. These applications are focused on a single cabinet providing a 15 or…. Truck subwoofer boxes and enclosures on sale at the best prices. Enclosure Design A significant advantage of the TriTrix is its relatively small enclosure requirements. If you design the box incorrectly (in other words mistune it, for example tune below Fs of driver {highly discouraged}) it can damage the woofer. Updated daily | Sealed Subwoofer Box Plans. This is the bracing as viewed from the baffle (where the speaker is mounted). Design By: FromanCreative. Sealed (or closed) enclosures. We know that it’s all about the sound so we design our Custom Fit Subwoofer Boxes for nearly every make and model vehicle. Free shipping and easy returns from Leonard Truck Accessories. This is the only driver that can. Easy and convenient build your box. Proposal : It's a sealed subwoofer enclosure adopting 8" woofer driver (W8-740M) and passive driver (W8-740N). Low minimums, instant quotes, and fast turnaround. The cost of Boxplot 3. I'm quite happy with them. The subwoofer box in its most simple form, serves to isolate the back of the speaker from the front, much like the theoretical infinite baffle. Hence the stuffing quantity tends to be less critical. Sealed Box Design • Compliance Ratio: α= V AS / V B • System-driver relationships: QTC /QTS ≈QEC /QES = F C/F S = ( α+ 1) 0. This enclosure measures just 15x12x3 inches, for an internal air volume of. The sealed (aka: air-suspension, acoustic-suspension) enclosure is a classic box design. When the speaker cone vibrates, it is moving in and out of the box, and this changes the box volume (slightly). Enter Speaker Design. Sealed subwoofers are just that. 8 out of 5 stars 12. Remember to bookmark to your Favorites for future reference. I would like to design it as a T Line subwoofer with the right tuning. Learn about speaker boxes. These enclosures serve a number of functions. Since your subwoofer needs to be inside the enclosure the best thing is to include a removable front panel in your design. Don't cut corners. Methods of determining an existing enclosure’s volume will be discussed as well as methods used to design a box to a given target volume. A larger enclosure also greatly enhances system efficiency in the deeper octaves, with no need for additional EQ boost to achieve. Featuring Sub Boxes and Sub Enclosures Made for Specific Drivers and Vehicles. You’ll need to purchase an amp and enclosure separately. In terms of getting loud, my ears are telling me that a decent subwoofer in a sealed box on just 300-500watts of power can get loud enough to blend with the fronts and provide good output and punch, but my eyes reading these forums are. Sealed bass boxes are generally more compact than ported sub boxes making it more convenient to fit into most cars. The simplest type of subwoofer to design and construct, sealed subwoofers consist of a driver, an enclosure, and an amplifier; the driver is responsible for 100% of the system’s output. Instead, use an up to date technology like Direct Servo or Linkwitz Transform (LT). How to make custom sealed subwoofer enclosure without fibreglass. sealed will yield a fairly flat response, and is the most accurate type of box. This is a discussion on The best Subwoofer Enclosure design within In-Car Entertainment, part of the Under the Hood category; Hi folks, We have seen people spending lot of money and time in setting up the most hitech Sound systems. (namely that of hiding an exposed subwoofer basket). This is done by building a subwoofer box about half the volume of a sealed subwoofer box, and placing two woofers facing each other. Audio Speaker Design CBVBSPK, as the name implies, is a free and portable speaker design software. Subwoofer Box Comparison Calculator: Compare bandpass, sealed and vented frequency output graphs for a subwoofer in one program. This enclosure has been tested by Atrend as well as Digital Designs to ensure its compatibility with DD Woofers. We know that it's all about the sound so we design our Custom Fit Subwoofer Boxes for nearly every make and model vehicle. Read product specifications, calculate tax and shipping charges, sort your results, and buy with confidence. Its overall performance envelope that puts it right at the top of its price class. The sound waves come out of the ported. It's not even worth trying without having the specs, and then, each cabinet design has its own formula. 5" to 18", different blueprints are available and pretty easy to download!. Speaker box design and speaker box calculator online for creating a high performance subwoofer enclosure. A sealed design allows a subwoofer to exhibit lower group delay, which is a measure of how fast the acoustic phase of the system changes. Build a ported box, sealed box for your low-frequency speaker. Bass Roll-off. Use a sealed enclosure if you want a full range of low tones. The Subwoofer DIY Page Sealed Systems 16 February 2020. Box Design ported vs sealed & what Hz? Hi All, I'm getting some equipment delivered in a few days time. The SVS SB13-Ultra, a compact yet powerful sealed subwoofer. Sealed cabinets are much easier to design and build than ported enclosures and are typically smaller in size. GS mids cover this range. Customize mailer boxes, shipping boxes, and folding cartons. Sealed enclosure size for car vs Home I built the enclosure for my recent X6 build and my installer suggested it would work better in a smaller box. In a front-loaded design, the rear of the speaker is usually sealed in some sort of chamber with the horn sticking out the front, so it works something like a sealed box with a front horn augmenting the sound from. Single Vs Dual Box Design: A single subwoofer box design is meant to offer great sound quality while a dual box design is designed to produce higher sound output. The display will continue to draw for sizes larger than that, but the drawing will be clipped by the viewing window. 3 Here is my plan for bracing the za5. 00 + (shipping & handling) Here is a list of the major features of Boxplot 3. 5 FC / QTC ≈FS / QTS where QTS is the total Q of the driver at F S for zero source resistance, i. It seems like the easy answer would be to design speakers for sealed enclosures with low resonant frequencies, right?. The EBP figure is used in many enclosure design formulas to determine if a speaker is more suitable for a closed or vented design. While a full primer on speaker enclosure design is well beyond the scope of this QA, there are many DIY websites that provide quite good information. The Q POWER 10" Shallow Single Subwoofer Enclosure features solid 5/8" MDF construction, charcoal carpet covering, a sealed design, and terminal cup connectors. Every speaker has a range of frequencies that it can produce -- some easier than others. 10" Shallow Mount Sealed Enclosure with Built-in Amplifier. Since we have already done all of the design work, we save you money by producing the most popular vehicle designs in higher quantities. There are two major types of speaker enclosures, sealed and ported. A vented enclosure is not much more complex than a sealed box. Eminence Designer is a versatile speaker box design program for PCs running Windows 7, Vista, XP, 2000, NT4, Me or 98. Our enclosure design is a result of testing different enclosure designs, with different panel thickness and with varying amounts of inner bracing. Smaller size, increased power handling, and JL Audio's own box design make the OEM-Spec. Get it as soon as Mon, Mar 9. 3 for a closed box speaker and a Q < 0. Easy and convenient build your box. When you tune a ported box to a specific frequency you are basically giving the speaker a helping hand at and around that specific frequency. They are very easy to install and produce quality audio. Our Proven wall material manufacturing. It's like buying 10 or more different subs for the price of one. Patented in 1949 by Harry Olson and popularized in the 1950's by Acoustic Research, this design has stood the test of time and has been adopted by many home and car audio companies. If the design is down firing, it is important that adequate clearance is provided. Wiring, Electrical and Installation Help Enclosure Design & Construction Help Car Audio Build Logs.