Qts for transmission line speaker

Transmission line, ported and vented designs are three different concepts on how to load the bass driver in a speaker enclosure. 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. Ported speaker are the most common as they are cheap to build and easy to design, though the quality of the bass reproduction is questionable in many designs and such a steep roll off can have knock on problems further up the frequency range. Sealed boxes have a similar roll off to transmission lines, however the efficiency of such systems is lower due to the inward radiating energy not being utilised by the cabinet. Distortion also occurs as the air in the box is compressed and expanded adiabatically as the cone moves in and out, the force required to move the cone changes non linearly with respect to the cone excursion. Both sealed and vented designs require careful absorption to avoid rear radiating sound bouncing off the cabinet walls, and passing through the bass driver causing boxy resonances.

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Content:

• Transmission line speaker stuffing
• Tapered transmission line calculator speaker
• Category: Transmission line speaker plans
• Transmission line speaker plans
• Category: Transmission line speaker design software
• T line box vs ported
• Transmission line subwoofer box calculator
• Category: Transmission line speakers kit
• Transmission line speaker kit
• Category: T line speaker plans

WATCH RELATED VIDEO: Transmission line loudspeaker Top #11 Facts

Transmission line speaker stuffing

If you find the contents of this page to be useful, please consider making a donation by clicking the Donate button below. Quarter-wave transmission line speakers employ enclosures that are tuned to provide low-frequency extension for the speaker driver. There are several types of transmission line enclosures and one of the more popular ones is the mass loaded transmission line MLTL. Basically, an MLTL is a quarter-wave transmission line enclosure with a port.

Now, some may argue that this is a bass reflex enclosure - and the line is indeed a bit blurry. However, rather than engaging in a lengthy discussion on naming conventions, I will use the term MLTL to describe a ported quarter-wave enclosure.

Thanks to a collection of MathCad programs developed by Martin J. If you do not have access to MathCad, MathSoft makes a MathCad viewer available, which allows you to work with the programs and perform all the needed simulations. You just cannot save your results. For details, as well as other options for how to obtain MathCad, see Martin J.

King's website. King's programs. Further optimization is likely needed. I have listened to speakers that used the Alpair I really liked the sound, though, the metallic cones bother me. The provide a boost in the mid treble that I don't care so much for. The cones are also really fragile. The Alpair 10 is classified as a 6" driver measuring mm in diameter. The effective area, Sd, of For MLTLs, there are three fundamental choices: Tapered with narrow top, straight pipe, or tapered with wide top.

Source: Bob Brines. With the MathCad programs it is trivial to try the different types of enclosures. For each taper, work through the design procedure and pick the configuration that provides the smoothest frequency response.

That indeed was the case with the Alpair 10P-A. This makes the resonant modes much easier to identify in the SPL graph. Once the enclosure has been tuned to the best performance, damping material is added to squelch the remaining resonant modes. Red is the combined SPL of the driver and the port. Blue dashed is the infinite baffle response of the driver. The design is often described as non-resonant, and some designs are sufficiently stuffed with absorbent material that there is indeed not much output from the line's port.

Among the first examples of this enclosure design approach were the projects published in Wireless World by Bailey in the early s, and the commercial designs of the now defunct IMF Electronics which received critical acclaim at about the same time. The tapering tube can be coiled for lower frequency driver enclosures to reduce the dimensions of the speaker system, resulting in a seashell like appearance.

Bose uses similar patented technology on their Wave and Acoustic Waveguide music systems. Transmission Line Calculator. Have also a look at Bailey's Transmission Line Calculator. The criteria for selecting a woofer for a TML loudspeaker box are still not clearly defined. Below is a list of woofers that have been successfully used in TML systems: Dynaudio.

Resonant frequency [f b ] approximately :. Usually, only drivers which have low Qts 0. However higher-Q drivers can be used. Just ensure that you simulate the results in a proper modeling program first before committing to a build!

Transmission line enclosures are usually a bit more complex to build than your common vented box, and you should spend a lot of time making sure that your simulation is correct before committing it to wood to make sure that you're not disappointed with the results. This is basically a transmission line that is terminated by a vent. There are several advantages to using this approach, including addressing the pipe resonances along the line and reducing the box size without giving up any noticeable output at low frequencies.

Design Notes: For these design notes, I will step you through the design process. My tool of choice for designing transmission lines is Hornresp. There may be better tools out there, but Hornresp is simple to use once you learn how to use it!

This is a cheap but decent quality 12" pro audio driver with a nice low Fs and Qts, making it suitable for a number of different designs. But what would the response of such a design be like? The following image shows the parameters for a Hornresp sim of this "classical" type of transmission line.

Note also that I have selected an "OD" offset driver simulation for this build - the reason for this will be explained later! As for "Vrc", "Lrc", "Ap1", "Lp", "Vtc" and "Atc", I've set those values to zero - we're not going to be using them for this simulation. A brief outline of what's shown in the sim above: Ang - for comparison purposes, this shouild always be set at "2. At this point, we can select "Tools Loudspeaker Wizard", and check what this sim is going to look like Ok, that looks like what a "classical" TL would look like, with the driver the red circle at one end and the vent at the other.

Now, let's see what the predicted response of this sim looks like Ugh, that looks pretty bad. The resonance frequency is where we expect it to be, but there's this massive notch in the resonse between Hz and Hz. Why is that? Well, because of resonances along the transmision line. That's because the transmission line does not resonate at one frequency - it resonates at many frequencies. We can see what the result of this looks like by looking at "Output 1", not the "Combined" output So, we're now looking at the response from the vent alone.

See that big peak between Hz and Hz? All I ever see is people sending links, and thats all I ever did to, was send links- to confusing brain boggler websights. Anyone with simple 8th grade- no scratch that, 6th grade level math can calculate tline enclosure dimesnions.

Most websights say how Tlines are un-realistic for cars, yeah, a 15" with a 24hz Fs, is pretty unrealistic. But a 12" with a 40hz bass boost can be as small as a sql box, for the same subwoofer. Maybe good for a large van, but definitley not a car.

Over the years I have learned tricks, and short cuts to tlines. I stick with tlines, because personally, its the Perfect box, for your sub. No more of that, "What box sounds best for my sub? Its in the environment that subwoofer is built for, with absolutley NO amplifier strain, yet huge db outputs. I still have never pwersonally ran over watts to a tline, yet I always stay in the low db-high s with awesome SQ.

Another Main plus side to tlines are, there is no back presure to keep efficiency up, xmax up, and allows the subwoofer to stop on a dime, and start back up faster than sealed, or ported designs. So, heres the formula, its simple, you would just need a penpaper, and calculator.

Quarter wave is all based on speed of sound, and length of the sound wave. Pretty long huh? So, a Tline for a 10" with a Fs of 30hz, and a cone area of About 60sq inches, will be about 9.

But, when building a t-line for a sub based on Fs, you need to keep in mind the speakers Qts, and Qms, they should be low for SQ, Qts of. Qts is speakers total quality in Ratio to its electrical, and mechanical characteristics, Qms is the Mechanical ratio. But it cant be mixed frequecies, like a deck with a 60hz boost, and a amp with 40hz boost, you need to cancel 1 freq out, or level the 2 freq's there will be cancelation, and the sub will sound like its being pushed to hard-boost for tline have to be close to the quarter wave of the box as possible This allows you to use a shorter tline length, in comparison to the speakers natural Fs quarter wave length.

But Tlines, with Low Q woofers, like. So, your looking at about 20hz almost as loud as the subs 40hz peak tunning. So, enuff explained. Build these Transmission Line Full Range Speakers by downloading this detailed 23 page plan that will show you how to go about it. The plans provide you with detailed step-by-step instructions and a list and links to tools, parts and materials that you will need.

This Build Plan is intended for the intermediate builder. When following this build plan, the end result should give you speakers that will have the following approximate specifications:. After initial listening tests, I can attest to the claim of better quality bass performance and a spacious soundstage of a Transmission Line speaker.

The Tang Band point source full range drivers are truly very well designed. The speakers disappear and you and you are left only with the music. These came out better than I initially expected, and honestly, I find myself listening to these speakers more and more.

Even with a moderate bass response, the sound is full enough not to fire up the subwoofer to fill in the low end. A very balanced, detailed and well rounded sound indeed! Transmission Line Speaker - Build Plan quantity.

Watch the build video above. Editor's Note: This methodolgy is obselete and here for historical purposes. Please start here. Some claim to have done this, but it doesn't seem to allow a first time build without adjustments, so the models have enough wrong to require a fudge factor at least. I can give you the basics, and explain the first principles, and this might allow you to forge ahead on your own.

My data is taken from Bailey, and years of experience of my own, culminating in several pairs of successfull T-lines, one of which I use to this day. The line area should equal or exceed slighty the cone area of the driver used. Normally, it is difficult to make the line area exactly equal to the cone area, as the frame and mounting immediately force an area larger than the cone area. This means a very tight sizing for the woofer mount and the begining of the line.

Tapered transmission line calculator speaker

List as of June - Trying to keep this page simple, most links go directly to the download page or to the online calculator page, but some of the sites are worth having a longer look around, with links to other Loudspeaker related pages etc. Also, If you know that any already listed here are inaccurate or problematic please post so note can be added or can be pulled from the list. It's possible to measure loudspeakers, to visualize the result, and to simulate a crossover with it. There's more out there, please post if there are others you like. Last edited by Hearinspace; 28th July at AM. I'm unaware of such list. Probably nobody uses them all so nobody can make such list.

Category: Transmission line speaker plans

Well when I built the t-line box for my single 12" dc lvl 4 xl I loved it. I had the it running off of a RF Tbd mono amp 1ohm. I was amazed in how crisp and clean each note sounded. And IDK it just doesn't sound as loud as it was before with the single 12" in the t-line box. Anyways I been toying with trying to figure out how to fit two 12" dc lvl4 xls into a t-line box that would fit in my trunk. The subs would basically be setting in the rear package tray firing up. With the port behind the fold down seats firing forward. Of course, Ill need to do some glass work to fully seal it off from the trunk that way its basically like having a walled enclosure but a t-line. Basically it will be a 2 boxes that way each sub has separate chambers. Ill have to build the box partly in the trunk to get it to fit But I think its possible.

Transmission line speaker plans

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Category: Transmission line speaker design software

Plans to build LA Dual 6. O-Ring pair for 15 inch woofer Pro Audio Equipment. Included are plans for both a dual and single 12" cabinet with either a single or dual 1" compression driver horn. Plans include parts list, dimensions, and notes on how to build your own set of LAa Line Array speaker cabinets. Also included in the plans are numerous detailed photos to help in the layout and construction.

T line box vs ported

A transmission line loudspeaker is a loudspeaker enclosure design which uses the topology of an acoustic transmission line within the cabinet, compared to the simpler enclosures used by sealed closed or ported bass reflex designs. Instead of reverberating in a fairly simple damped enclosure, sound from the back of the bass speaker is directed into a long generally folded damped pathway within the speaker enclosure, which allows far greater control and use of speaker energy and the resulting sound. Inside a transmission line TL loudspeaker is a usually folded pathway into which the sound is directed. The pathway is often covered with varying types and depths of absorbent material, and it may vary in size or taper, and may be open or closed at its far end. Used correctly, such a design ensures that undesired resonances and energies, which would otherwise cause undesirable auditory effects, are instead selectively absorbed or reduced " damped " due to the effects of the duct, or alternatively only emerge from the open end in phase with the sound radiated from the front of the driver, enhancing the output level "sensitivity" at low frequencies. The transmission line acts as an acoustic waveguideand the padding both reduces reflection and resonance, and also slows the speed of sound within the cabinet to allow for better tuning. Transmission line loudspeakers designs are more complex to implement, making mass production difficult, but their advantages have led to acclaim for a number of manufacturers such as IMFTDLPMC.

Transmission line subwoofer box calculator

If you find the contents of this page to be useful, please consider making a donation by clicking the Donate button below. Quarter-wave transmission line speakers employ enclosures that are tuned to provide low-frequency extension for the speaker driver. There are several types of transmission line enclosures and one of the more popular ones is the mass loaded transmission line MLTL.

Category: Transmission line speakers kit

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One is why i came on here to get the guidance i need, thank you all. Yes DonVK it pros have a removable panel, i do much to fix this. As you can see i have passed various types of fill in the rising and it did help a fully. I was considering what Winnie suggested which was to cut a hole behind the crystal with a hole saw and see the new it has.

Transmission line speaker kit

If you find the contents of this page to be useful, please consider making a donation by clicking the Donate button below. Quarter-wave transmission line speakers employ enclosures that are tuned to provide low-frequency extension for the speaker driver. There are several types of transmission line enclosures and one of the more popular ones is the mass loaded transmission line MLTL. Basically, an MLTL is a quarter-wave transmission line enclosure with a port. Now, some may argue that this is a bass reflex enclosure - and the line is indeed a bit blurry. However, rather than engaging in a lengthy discussion on naming conventions, I will use the term MLTL to describe a ported quarter-wave enclosure.

Category: T line speaker plans

However higher-Q drivers can be used. Just ensure that you simulate the results in a proper modeling program first before committing to a build! Transmission line enclosures are usually a bit more complex to build than your common vented box, and you should spend a lot of time making sure that your simulation is correct before committing it to wood to make sure that you're not disappointed with the results. There is a variant of the transmission line called the mass-loaded transmission line.