Any number in this box will override any number in the 'Desired Gross Volume' box. 3 - The 'Desired Gross Volume' box acts much like the 'Desired Net Volume' box, except all displacements are taken into. 4 - If the '# of ports' box is greater than 0, that will automatically get taken into effect and the calculator will ignore the. Online Loudspeaker Enclosure Calculation. On this page you are able to calculate a speaker enclosure with Thiele/Small parameter. The colors of the curves in the diagrams for frequency response, step response, group delay and voice-coil impedance have the following meaning: Black: Vented-Box with Thiele/Small-Parameter (Bullock alignment).
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If you are just looking to downlaod WinISD and want to skip the overview, you can go directly to the last section of this page
Screenshots
The main interface..
Whilst you can only have one graph window open at a time, you can have multiple projects open. This makes it easy to compare different designs.
Working through each Tab on an individual project window
Clicking on the Parameters label toggles the visibilty of the bottom half of the panel(regardless of which Tab you are on)
Note that the volume shown is the Working Volume,and does not include the space occupied by the driver or portsDragging horizontally will change the tuning frequency.
The graphs change as you go.Enter port details on this tab.Set the end correction from the drop-down list showing which ends are flanged**.
In a multi-port design, the vent length shown is for each port
This is also where you can see the frequency of the first port resonance.
Note**: Flanged means flush with a panel. Not to be confused with flared,which WinISD does not support. Once you have your design, you can useBoxnotes or Sonosub to account for flares as well as the volume occupied by the components.
If using multiple drivers, this is the total power,not the individual power to each driver
Using the Save button usually pre-loads the file name into the save dialog box for you. (unlike choosing Save from the menu)
The three most commonly used graphs..
The most important one.T Line Subwoofer Box Calculator Software
Watch this as you change box size and tuning frequencyWinISD recommends keeping velocity to 17 m/sec.Bandpass Subwoofer Box Design Software
This can be refined further by using Flare-itKeep your excursion to Xmax + 10%High Pass Filter modelled in WinISD
WinISD has a built in filter section. Access it by selecting the EQ/Filter tab and click the Add button to get this screen. This allows you to model the effects of different filters.
To control cone excursion below the port tuning frequency, it is often neccessary to employ a high pass filter.
A favoured design is the Linkwitz-Riley filter 4th order filter, which is entered as follows:
The 4th order filter has a Q of 0.5 - if you enter any other value, WinISD will ignore it.
To achieve control of excursion without compromising SPL more than neccessary, try different values for the Cutoff frequency. Here is a graph showing how excursion changes with filter design frequency. Xmax is the thin red horizontal line at 9mm
In this example, the blue graph is the one which achieves a maximum excursion of Xmax + 10%
Modelling Boost
The effect of boost can be modelled with the Parametric EQ filter.
The first step is to specify the type of boost.
The software defaults to a Q of 2.0 which seems to be the best fit.
Other values may be more appropriate though - here is how SPL changes with different values for Q
The second step is to set the correct System input power.
WinISD takes whatever you set as the System Input Power and then adds the boost. The result of this process must not exceed the maximum power of your system.
This means that the System Input Power must be set lower than the maximum power by an amount equal to the boost.
The following table shows how much to reduce the power for a given boost
| Boost in dB | Divide maximum power by: |
| 1 | 1.3 |
| 2 | 1.6 |
| 3 | 2.0 |
| 4 | 2.5 |
| 5 | 3.1 |
| 6 | 4.0 |
| 7 | 5.0 |
| 8 | 6.3 |
| 9 | 7.9 |
| 10 | 10.0 |
As an example, the Blast Furnace is designed for 240w maximum power and has a boost of 6dB.
For 6dB, we must divide the maximum power by 4, so we set the System Input Power to 60w
As a check that you have got it correct, load a second copy of your project, remove the boost and set the System Input Power equal to your maximum power. Compare the SPL at the boost frequency for the two projects - they should be the same.
Here's our example continued. Red line is 240w with no boost. Green is 60w with 6dB boost @ 35hz. Notice how the two curves are equal at the boost frequency of 35hz
Signal Generator
A signal generator is also included for testing speakers via your sound card and has a range of control options including selecting the frequency from the cursor position on the response graph. If using this function, be careful not to overdrive the output The generator allows you to produce a single frequency, or a sweep across a range.
For the single frequency option, you can manualy specify the frequency, or you can use the cursor to pick the frequency from on of the WinISD graphs.
Unlike some other products, this one doesn't produce any clicks during sweep mode.
There is also an output attenuator, allowing control of the signal level
Recently I have used TrueRTA's spectrum analysis software to have a look at the signal WinISD produces.
TrueRTA has several price / performance options, with this handy oscilloscope function in the free version.
I discovered that the default attenuation of zero, leads to an overdriven situation - at least with my sound card and windows setup.
The following TrueRTA screenshot shows how the signal has the peaks clipped. This produces a whole stream of harmonics. Not the best signal for testing your speakers
The following TrueRTA screenshot shows the results of decreasing the output level from the WinISD tone generator. The clipping is gone and the output is a clean sine wave. Note the vertical scale has been changed from 2 to 1 volt / division
Setting the Attenuation control to 6 was enough to restore a pristine sine wave. Your results may vary
Now, whenever I use the tone generator, I use TrueRTA to make sure I'm not getting a clipped signal
Flanged vs flared ports
Some people get confused as to the difference between flanged ports and flared ports.
A flanged end is an end that terminates in a flat panel, such as the wall of an enclosure.
A flared end is one that has an expansion section, typically one quarter of a circle in cross-section, to control port noise.
WinISD can factor in flanged ends by applying an end-correction factor. The current version cannot handle flared ends.
Here are some examples..
Since WinISD does not know about flared ports, a manual correction needs to be done. As the following drawing shows, part of the air in a flared port belongs to outside the port. It is generally accepted that half the flare radius needs to be subtracted for each end that is flared. The effective length is what needs to be entered into WinISD.
Help file and FAQ
The help file and FAQ has all you need to know in order to use the software. WinISD is freeware Skin winamp 2018. with a facility to make a donation.
Quick Tip: Entering driver parameters
Driver parameters can be a pain to enter into the database. If you're having trouble getting it to accept parameters, follow this advice from one of the authors..
Try entering just Qms, Re, Mms, Cms, Bl, Sd, hg, hc, Xlim (optional) and Pe. Do not change any parameters the program calculates. That way the data is consistent. You can of course add the dimensional parameters if you like
If you can't get that to work, user Soho54 from AVSforum swears by the following..
Enter the numbers in this order: Sd, Re, Le, Fs, Qes, Vas, Qms, xmax, and then Pe. That's it, now save
Case Study
A case study used to prototype the snorky design illustrates the use of WinISDAdditional WinISD resources
- Steve Dart's excellent tutorial on using WinISD including entering driver parameters without errors
- A few observations about the various graphs can be found in this discussion at Speakerplans.com
- There are quite a few subwoofer driver files at Hometheatershack
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While you're here, you might want to check out some free software that compliments WinISD
Whilst WinISD is excellent for designing your working volume, tuning frequency and filter frequencies, there are some things it doesn't do. The following sofware adds plenty of value to your design process.
Boxnotes - check your enclosure design for resonances, factor in the volume taken up by ports and print your cutting list
Sonosub - design a cylindrical subwoofer. Check resonances and clearances
Flare-it, - find the correct port diameter and flare size to avoid audible turbulence
Subsaver - calculator for finding component values for a 2nd-order high-pass filter
QRDude - Software for designing advanced QRD diffusers
Subwoofer Box Design Software For Pc
You can download WinISD from Linearteam in Finland.
This overview describes version 0.50a7 Pro
There is a later version which has similar functionality ie it also calculates box volumes for ported and sealed enclosures using an easy to use interface and also calculates port lengths.
Many graphs are available, including the three used in the Projects section, ie Sound Pressure Level, Vent Air Velocity and Cone excursion, all relative to frequency.
Best Subwoofer Box Design Software
An extensive database of drivers is included and it is easy to add your own entries. This lets you compare different drivers before you go out and spend any money. It is surprising how the final box size and response varies with the driver chosen. Bigger and dearer isn't always the best. Choose wisely, grasshopper!
| Home Catalog Tech Topics Audio Links About WinSpeakerz | ||||||
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WinSpeakerz is our loudspeaker simulation program for Windows XP/Vista/Windows 7/8. This popular speaker simulator lets you propose various speaker systems and then evaluate them in software before you cut wood or order expensive transducer components. A typical design session might go like this: you select a woofer for your home theater project from the driver database and load it to the 'workbench'. Next, you select the type of enclosure you want to simulate. You have a choice of closed, vented or bandpass boxes with a total of 18 different variations. For your home theater project you decide on a vented box. Now enter different volumes and tunings and run the analysis to see 'what if'. Once you've decided on the box you can open the box calculator and have WinSpeakerz suggest the dimensions. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| An Overview of WinSpeakerz | |||||
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The WinSpeakerz Workbench | |||||
The Box window (bottom right) is where you describe the box type you want WinSpeakerz to analyze. In the example above, the 2nd Order Closed Box is selected. When you select a box type from the Box menu the Box window will be redrawn for your selected box type. An icon at the top left of the Box window shows at a glance the type of box you are working with. WinSpeakerz allows you to design 18 different box types! Plus you can specify any number of identical drivers in an enclosure. | |||||
| The WinSpeakerz Driver Database | |||||
Because driver selection is such a crucial part of speaker design, WinSpeakerz includes a very sophisticated loudspeaker Driver Database. From the database page you can search for drivers that meet your requirements for a project. For example, your next project might be for a home theater system and you're interested in 10' drivers with an SPL of 92. You can instruct the database to show you just those drivers that are 10' in diameter with an SPL of 92 and assign those drivers a keyword. This allows you to quickly find the best driver for your project without searching through individual manufacturers catalogs and data sheets. New drivers can be added to the database just by filling out a new driver form. The Driver Database has over 1,000 drivers included. You'll find JBL, EV, Vifa, Dynaudio, Fane, Focal, Alpine, Rockford Fosgate and many others. Of course you can add new drivers to your Driver Database by entering the basic Thiele Small parameters. Each Driver Record is extremely detailed with provisions for over 98 different driver parameters. Enter as much or as little information on each driver as you'd like. Space is provided for such details as the driver's bolt circle diameter, front and rear mount baffle cutout diameters and retail price. Driver records can be added, edited and deleted. | |||||
The WinSpeakerz Driver Database | |||||
| The Box Calculators | |||||
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The WinSpeakerz Box Calculators | |||||
The Crossover Calculators | |||||
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The WinSpeakerz Crossover Calculators | |||||
| The WinSpeakerz System Editor | |||||
The System Editor comes into play after you've selected a driver and have started working at the Workbench. In order to see the full details of the System currently on the Workbench you open the System Editor by selecting 'Edit System' under the Edit menu (or at the toolbar). The System Editor is the place to make adjustments to various system parameters (such as box loss Q, isobaric factor, R(e), etc.), write notes on the system as well as make custom adjustments to this System's particular driver. | |||||
The WinSpeakerz System Editor, System Details Page | |||||
| The WinSpeakerz Project Files | |||||
WinSpeakerz organizes your work in Project files. Starting with a new Project file the designer opens the Driver Database and selects a driver to load to the Workbench. Back at the Workbench the designer proceeds to look at the performance of the driver in various enclosures. As he works he saves some of the best designs to the System memories. After saving a couple of Systems based on the first driver the designer might return to the database to select an alternate driver and then save a few more Systems to additional memory locations in the Project file. Each Project file holds 10 System memories, each a snapshot of the Workbench containing a complete driver file, full details on the enclosure, crossover, impedance compensator networks, and detailed notes on the System. Systems can be instantly recalled to the Workbench by clicking the corresponding buttons on the toolbar. Any combination of saved Systems can be recalled for comparison of different drivers in similar enclosures or the same driver in various enclosures. | |||||
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