Cms compliance of the drivers suspension, in metres per newton the reciprocal of its stiffness. These are electromechanical parameters that can be used to define how a loudspeaker driver performs. Enter as much or as little information on each driver as youd like. This section is based on the classic work of neville thiele, richard small, and the earlier work of bart locanthi. The loudspeaker parameters were first described by thiele in 19611, but were not accepted widely until after they were republished in the journal of the audio engineering society in 1971, and small, over the next three years, published a series of papers 28 that expanded them and. Thiele small parameters explained with real world cases. The driver radiation mass load is the weight of the air the amount calculated in vd that the cone will have to push. Database of speakersdrivers, more then 300 brands and 5000 speakersdrivers. Thiele and small devoted considerable effort to show how the following.
The thielesmall ts parameters are commonly used by engineers to define the relationship between a speaker and a particular enclosure. Also, the ts database is really only useful for box design, and for a driver database to be more useful there should be associated measurement data, or at least links to the measurement data. Loudspeaker system performance can be quantitatively related to a set of electromechanical parameters. Small thus thielesmall loudspeaker parameters ria thiele 19041996, german actress, dancer and choreographer.
Loudspeaker enclosure calculating with thiele small parameter. These parameters are published in specification sheets by driver manufacturers so that designers have a guide in. Using these parameters, a loudspeaker designer may simulate the position, velocity and acceleration of the diaphragm, the input impedance and the sound output of a system comprising a lou. This design is a driver specific enclosure design and it is crucial to have the correct thiele small parameters for your drivers in order to achieve the intended alignment model from the formulas. If you fall under the first two options you can skip the next section as it will go over entering driver data in winisd as well as what all the ts specifications mean. Jbl thielesmall low frequency driver parameters and definitions thiele small parameters and speaker specifications. All trademarks are property of their respective owners. The thiele small parameters often referred to as ts parameters are provided in specification sheets by most manufacturers but what are they for. You may need to experiment with different voltages, depending on the accuracy of your current readings or calculations. It is the frequency where the driver moves with minimal effort. The thielesmall parameters revisited hornlautsprecher. Thielesmall commonly refers to a set of electromechanical parameters that define the specified low frequency performance of a loudspeaker driver.
Fs also called f0, resonance frequency measured in hertz hz. A speaker with an impedance of 4 ohms will have r e 2. Has anyone had any experience of these units or know off an alternative. Interestingly, though, thiele, small, and several other audio researchers and engineers have determined an ingenious methodology for gleaning these composites from a few simple measurements of the voice coil impedance and how it varies near the drivers resonant frequency. Interesting info on thiele cabs page 2 the gear page. Now, choose a driver and speakerbuilder pro will fetch the thielesmall parameters from our database, and your ready to start calculating. It is a bit technical, and unavoidably requires some familiarity with electrical circuit theory. Of course you can add new drivers to your driver database at any time by entering the basic thielesmall parameters. Cms compliance of the driver suspension compliance is the opposite of stiffness. Thielesmall parameters explained tech stuff tuesday. Driver thielesmall parameters both driver electromechanical parameters both. This is a short definition list of the thiele small ts speaker parameters. Most were specified in the early sixties and seventies by a.
This document further reinforces the premise that the socalled thielesmall parameters relate primarily if not exclusively to the speaker driver itself, not to a given speakers enclosure i. The lite version still has 85% of the features of the pro version. The thielesmall parameters for measuring, specifying and designing loudspeakers neville thiele introduction. Its possible to get most of the thielesmall parameters from a loudspeaker by just accurately measuring the impedance versus frequency. You can also submit new or your own ts data to help make the database even better. Thiele small loudspeaker parameters transparent sound.
A crossover network, filter or lpad can be designed with just the impedance of each driver. Beyond thielesmall dumax and klippel driver measurement. Car audio thielesmall parameters home car audio subwoofer enclosures thielesmall parameters this group of parameters outlined by a. On this page you are able to calculate a speaker enclosure with thielesmall parameter. Begin by filling in the input fields white boxes for your driver specifications in the spreadsheet. As of this post, the current attached zip file contains the following.
Small who pioneered this line of analysis for loudspeakers. If this is done twice, one with the driver in open air and one with an added known mass it should be fairly easy to calculate the fs, vas and qt. Net parameters are displayed when more than one driver is specified. This is the dc resistance of the driver measured with an ohm meter and it is often.
Think of this as how good a weightlifter the transducer is. These thielesmall, or ts, parameters are all thats needed to. But there are other measurement methods we can use to determine and quantify nonlinearities. Thielesmall parameters might not be what you think they are, this video explains what they are and how they effect each other. Furthermore, a host of other useful design parameters are listed. Thiele small parameters are a set of electromechanical parameters that define the specified low frequency performance of a loudspeaker driver. The calculation of sealed, bassreflex, bandpass boxes by thielesmall parameters. Loudspeaker repairs these companies or individuals will repare all or most generic dynamic loudspeakers that is usually both the loudspakers drivers themeselves and the boxes in addition to refoaming replacing the rotted foam suspension of the driver, however this does in most cases not include reconeing which is a specialised trade and repairs of electrostatic loudspekers and other. They are useful when designing speakers because they are more easily determined experimentally than more fundamental mechanical parameters.
Magnetic flux density in gap, in teslameters tm bl. Bl motor strength, product of magnetic field strength b and length of wire in field l mms the moving mass of the cone, including air load. What do the driver ts parameters mean and will they help me choose the best driver. Ventedbox with thielesmallparameter bullock alignment. Once you understand some of the basics of the thiele small parameters, you will know what to look for when it comes to choosing a loudspeaker driver. At any rate, a thiele cabinet in the boogie sense is a specific sort of design, for a specific driver, and related to thielesmall only in name. Anyone who is serious about designing a loudspeaker using dynamic drivers is either familiar with, or has used, thielesmall parameters, generally accepted as ways to predict driver behavior in different enclosures. Acoustic suspension enclosure calculator db dynamix audio.
Of course you can add new drivers to your driver database by entering the basic thiele small parameters. These parameters are published in specification sheets by driver manufacturers so that designers have a guide in selecting offtheshelf drivers for loudspeaker designs. The driver is nos, never been used, still in the factory box. Expressed in tesla meters, this is a measurement of the motor strength of a speaker. The frequency at which the combination of the energy stored in the moving mass and suspension compliance is maximum, and results in maximum cone velocity. Nice post mang, because alot of times the actual documentation from the distributor, is not complete. What do the driver ts parameters mean and will they help.
If you do not need the large driver database and specialized features of the pro version, you can save money and purchase the lite version. Jan fredriksson of the thielesmall loudspeaker databaseweb site maintains one of the largest databases for thielesmall parameters of your favorite loudspeaker units. Small in a series of famous articles published in the 197172 journal of aes audio engineering society. The colors of the curves in the diagrams for frequency response, step response, group delay and voicecoil impedance have the following meaning.
The thiele small loudspeaker database list thread loudspeaker thielesmall parameter extraction sonic beacon. But they can also provide some measures describing loudspeaker components that defy marketing interpretation. With sufficient thielesmall parameters the program can also design impedance equalization networks and it can display the response in its four performance graphs. The drivers thielesmall parameters were brought about in a bid to standardize and bring meaning to the behavior of a cone loudspeaker.
The first section presents a derivation of the equivalent circuit of a speaker in sealed, and vented bassreflex, enclosures. A more compliant suspension or a larger moving mass will cause a lower resonance frequency. The parameters marked with an asterisk are the minimum set required for a complete low. Lets round up most of the thiele small parameters, try to explain them and give real world examples. The electrovoice tl806 plan aka mesa thiele 1x12 cab in its mesa boogie premade edition, loaded with the evm12l, is a popular choice for guitarists who seek to emulate stevie ray vaughan andor his epigones preferred, driverclean, allbreakupcomesfromamppedal tones. Its not extremely difficult and frankly more accurate for any given driver especially a vintage one to measure most of them oneself. Neville thiele, australian engineer, known for having simplified and made into practical approach the algorithms for calculating loudspeaker cabinets similarly as richard h. Thielesmall parameters were created from the hard work of wait for it. The following are small signal mechanical parameters, and are measured at small signal levels. This is a calculator for designing an acoustic suspension enclosure. Fs or f0 hertz this is the resonance frequency in free air. You can also click on the driver link to display the ts specs for each driver. Driver parameter calculator is intended for electrodynamic.
As was common these days the full driverbox model was reduced and simplified to ease calculation and to derive nomographs so that. Some of the data are descriptive only, and cannot be checked. I want to look up the vintage drivers in thielesmall loudspeaker database. The second illustration shows the parameters tab containing the drivers thielesmall and electromechanical parameters. Each driver record is extremely detailed with provisions for over 98 different driver parameters. Select type, subwoofer, woofer, mid bass, midrange, fullrange, coaxial, compression driver, tweeter, amt tweeter, dome tweeter, ribbon tweeter, ring. I want to look up the vintage drivers in thielesmall. Thielesmall commonly refers to a set of electromechanical parameters that define how a loudspeaker driver performs. If the driver has a dual voice coil, separate parameters can be entered for each of the three voice coil wiring methods separate, parallel and series.
Jan fredriksson of the thielesmall loudspeaker database web site maintains one of the largest databases for thielesmall parameters of your favorite loudspeaker units. From the driver database you can search for drivers that meet your specific requirements for a project. On this page you are able to calculate a speaker enclosure with thiele small parameter. Small, describe the electrical and mechanical characteristics of mid and low frequency loudspeakers operating in their pistonic region. 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 users input fields. This is a database of klipsch driver thiele small specifications for use in winisd. In the early seventies, several technical papers were presented to the aes audio engineering society that resulted in the development of what we know today as thielesmall parameters. There is a time and place to dump old junk, and now is the time for this driver. Here is the link to the measurement database for psdlite.
Winisd pro tutorial and download a detailed guide on how. Thiele small loudspeaker parameters page 3 of 5 set the output of the amplifier to between 0. Thiele and richard small, who, through experimentation, came up with a method of measuring certain features parameters of a driver and how they mathematically influence the design in which the driver is to be used. These parameters are known in the industry as thielesmall parameters. The thielesmall parameters window is used to calculate the parameters for a. Thiele small ts speaker parameters diyaudioprojects. Then the relationship between the equivalent circuit. R e will have a lower value than the impedance of the driver.
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