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. Thiele small loudspeaker parameters page 3 of 5 set the output of the amplifier to between 0. The drivers thielesmall parameters were brought about in a bid to standardize and bring meaning to the behavior of a cone loudspeaker. Beyond thielesmall dumax and klippel driver measurement. There is a time and place to dump old junk, and now is the time for this driver. Select type, subwoofer, woofer, mid bass, midrange, fullrange, coaxial, compression driver, tweeter, amt tweeter, dome tweeter, ribbon tweeter, ring.
As of this post, the current attached zip file contains the following. You can also click on the driver link to display the ts specs for each driver. Thiele small loudspeaker parameters transparent sound. The colors of the curves in the diagrams for frequency response, step response, group delay and voicecoil impedance have the following meaning. Thielesmall commonly refers to a set of electromechanical parameters that define the specified low frequency performance of a loudspeaker driver. The driver is nos, never been used, still in the factory box.
These thielesmall, or ts, parameters are all thats needed to. Thiele small ts speaker parameters diyaudioprojects. The lite version still has 85% of the features of the pro version. Now, choose a driver and speakerbuilder pro will fetch the thielesmall parameters from our database, and your ready to start calculating. Most were specified in the early sixties and seventies by a. Some of the data are descriptive only, and cannot be checked. Nice post mang, because alot of times the actual documentation from the distributor, is not complete.
The thielesmall parameters for measuring, specifying and designing loudspeakers neville thiele introduction. A speaker with an impedance of 4 ohms will have r e 2. Furthermore, a host of other useful design parameters are listed. All trademarks are property of their respective owners. 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.
I want to look up the vintage drivers in thielesmall. Expressed in tesla meters, this is a measurement of the motor strength of a speaker. You can also submit new or your own ts data to help make the database even better. Database of speakersdrivers, more then 300 brands and 5000 speakersdrivers. 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. Has anyone had any experience of these units or know off an alternative. Driver parameter calculator is intended for electrodynamic. The thiele small loudspeaker database list thread loudspeaker thielesmall parameter extraction sonic beacon. Think of this as how good a weightlifter the transducer is. A more compliant suspension or a larger moving mass will cause a lower resonance frequency.
Jan fredriksson of the thielesmall loudspeaker databaseweb site maintains one of the largest databases for thielesmall parameters of your favorite loudspeaker units. They are useful when designing speakers because they are more easily determined experimentally than more fundamental mechanical parameters. 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. The thiele small parameters often referred to as ts parameters are provided in specification sheets by most manufacturers but what are they for.
But they can also provide some measures describing loudspeaker components that defy marketing interpretation. Acoustic suspension enclosure calculator db dynamix audio. Interesting info on thiele cabs page 2 the gear page. 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. Begin by filling in the input fields white boxes for your driver specifications in the spreadsheet. This section is based on the classic work of neville thiele, richard small, and the earlier work of bart locanthi. R e will have a lower value than the impedance of the driver. Fs or f0 hertz this is the resonance frequency in free air.
The second illustration shows the parameters tab containing the drivers thielesmall and electromechanical parameters. These parameters are published in specification sheets by driver manufacturers so that designers have a guide in. 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. 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. Each driver record is extremely detailed with provisions for over 98 different driver parameters. These parameters are published in specification sheets by driver manufacturers so that designers have a guide in selecting offtheshelf drivers for loudspeaker designs. Here is the link to the measurement database for psdlite. 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. A crossover network, filter or lpad can be designed with just the impedance of each driver. Net parameters are displayed when more than one driver is specified.
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. The driver radiation mass load is the weight of the air the amount calculated in vd that the cone will have to push. This is a calculator for designing an acoustic suspension enclosure. It is a bit technical, and unavoidably requires some familiarity with electrical circuit theory. Meaning of thielesmall parameters ts specifications are electromechanical properties that essentially define how a driver will perform. The following are small signal mechanical parameters, and are measured at small signal levels. I want to look up the vintage drivers in thielesmall loudspeaker database. Jan fredriksson of the thielesmall loudspeaker database web site maintains one of the largest databases for thielesmall parameters of your favorite loudspeaker units. Fs also called f0, resonance frequency measured in hertz hz. Its not extremely difficult and frankly more accurate for any given driver especially a vintage one to measure most of them oneself. Thielesmall parameters were created from the hard work of wait for it. Its possible to get most of the thielesmall parameters from a loudspeaker by just accurately measuring the impedance versus frequency. What do the driver ts parameters mean and will they help me choose the best driver.
Loudspeaker system performance can be quantitatively related to a set of electromechanical parameters. 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. If youre not interested in the nitty gritty, then its probably sufficient to be aware that the parameters are normally used when it comes to doing simulations of loudspeaker behaviour for. Thiele and small devoted considerable effort to show how the following. These are electromechanical parameters that can be used to define how a loudspeaker driver performs. 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. This is a database of klipsch driver thiele small specifications for use in winisd. Magnetic flux density in gap, in teslameters tm bl. Small who pioneered this line of analysis for loudspeakers. But there are other measurement methods we can use to determine and quantify nonlinearities.
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. Ventedbox with thielesmallparameter bullock alignment. Xover pro scales its capabilities to fit the quantity of available driver information. 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. Neville thiele, australian engineer, known for having simplified and made into practical approach the algorithms for calculating loudspeaker cabinets similarly as richard h.
Car audio thielesmall parameters home car audio subwoofer enclosures thielesmall parameters this group of parameters outlined by a. 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. Thielesmall parameters explained tech stuff tuesday. 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. 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. Cms compliance of the drivers suspension, in metres per newton the reciprocal of its stiffness.
Lets round up most of the thiele small parameters, try to explain them and give real world examples. Thiele small parameters explained with real world cases. 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. Small thus thielesmall loudspeaker parameters ria thiele 19041996, german actress, dancer and choreographer. The driver database is not provided with the demo version of winspeakerz. Thiele small parameters are a set of electromechanical parameters that define the specified low frequency performance of a loudspeaker driver. This is a short definition list of the thiele small ts speaker parameters. Winisd pro tutorial and download a detailed guide on how.
As was common these days the full driverbox model was reduced and simplified to ease calculation and to derive nomographs so that. Thielesmall parameters might not be what you think they are, this video explains what they are and how they effect each other. On this page you are able to calculate a speaker enclosure with thiele small parameter. Driver thielesmall parameters both driver electromechanical parameters both. These parameters are known in the industry as thielesmall parameters. What do the driver ts parameters mean and will they help. Small in a series of famous articles published in the 197172 journal of aes audio engineering society. Then the relationship between the equivalent circuit. The thielesmall ts parameters are commonly used by engineers to define the relationship between a speaker and a particular enclosure.
Thielesmall commonly refers to a set of electromechanical parameters that define how a loudspeaker driver performs. This is the dc resistance of the driver measured with an ohm meter and it is often. The parameters marked with an asterisk are the minimum set required for a complete low. Of course you can add new drivers to your driver database by entering the basic thiele small parameters. The thielesmall parameters window is used to calculate the parameters for a. Jbl thielesmall low frequency driver parameters and definitions thiele small parameters and speaker specifications. 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.
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. The first section presents a derivation of the equivalent circuit of a speaker in sealed, and vented bassreflex, enclosures. From the driver database you can search for drivers that meet your specific requirements for a project. The thielesmall parameters revisited hornlautsprecher. With sufficient thielesmall parameters the program can also design impedance equalization networks and it can display the response in its four performance graphs. The calculation of sealed, bassreflex, bandpass boxes by thielesmall parameters. Small, describe the electrical and mechanical characteristics of mid and low frequency loudspeakers operating in their pistonic region. 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. Loudspeaker enclosure calculating with thiele small parameter. 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. Cms compliance of the driver suspension compliance is the opposite of stiffness.
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