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TURBOBASS EXPRESS README FILE
Program: TurboBass Express V5.01 (C) 1993-2006.O.K. So you would like to design some speaker cabinets for yourself. Easy, I don't expect to turn you into an acoustic engineer, but you may be wondering what all those funny symbols are about, well forget them! The software TurboBass Express allows you to design cabinets for a single transducer (speaker) easily with just 3 parameters from the technical data sheet of the speaker you want to use. Contact the manufacturer to obtain the TS parameters needed to successfully calculate your box. Try Google. Enter the product code of your loudspeaker. Alternatively CALL THE MANUFACTURE!
Remember that you have just spent a small fortune buying those subs, but to get them working right and to make them respond to your requirements, they will need a box made to the correct size, otherwise you are wasting your time with them. Don't just any old box them TURBOBASS THEM!
It's all about cabinet design to blow your mind!
Uses? For in-car bass box enclosures. Other applications include professional sound systems for clubs and carnival floats.
How it works. Here is an example using a 1200GTI sub woofer...
First convert the Vas given here by JBL in litres to cubic feet, use the TurboBass Express converter it's FREE Click here! 56.64 Litres = 1.999958 Cubic Feet
A sealed-box design is much easier than a vented-box design. There are fewer parameters to worry about, and the final system response is much less sensitive to variations in these parameters. Building a closed box is easier, because constructing and fitting a vent to a cabinet can add several hours to the project construction time. Tuning a vent can be time consuming, although it can be well worth the trouble with most drivers given the vented boxes lower box resonance frequency, others will give excellent performance in a closed box.
Vented-box design the response obtained by using this program to design vented boxes is known as the FOURTH-ORDER BUTTERWORTH, considered by most designers to be optimum. it is flat, with no peaks or dips, and consequently dose not sound boomy. Note that internal porting subtracts the internal volume from your box, add the port to your box size! Mounting the duct on the back of the cabinet or even underneath it, can help attenuate any objectionable noises produced by the vent.
In order to tune the box calculated by the vented box program a vent of a specific size must be installed. The vent must have an area large enough not to impede air flow, otherwise vent noises such as whistling and chuffing will be heard. Small considers that maximum air velocity in a vent dose not exceed 5% of the speed of sound, vent noise will not be a problem, nor will constriction of air flow alter the system parameters.
TurboBass Express. It's all about cabinet design to blow your mind! Download TurboBass @ c|net
Richard H. Small
For more than 40 years,
Neville Thiele's and Richard Small's Thiele-Small (TS) parameters have
been the de facto criteria for assessing the performance of
loudspeakers. Their unified approach analyzes the electromechanical
behaviour of a speaker's components and the interaction with each other
and with the air inside and outside the speaker cabinet. The resulting
equation is mathematically identical to that describing a circuit. Then,
sound produced by the speaker can be calculated by a simple circuit
analysis. By using the TS parameters in computer models, users could
design the loudspeaker/cabinet interface without having to manually
build a speaker cabinet.
Richard Small's experience in electronic circuit design for high performance analytical instruments at the Bell & Howell Research Canter in Calif. laid the foundation for his loudspeaker analysis and measurement work at The University of Sydney. Later, he was head of Research at KEF Electronics Ltd. in Maidstone, England. A Senior Member of the IEEE, Dr. Small is a member of the Institution of Engineers Australia. He is a Fellow of the Audio Engineering Society and has received the Society's Publication Award, Silver Medal and Gold Medal. He is a senior principal engineer for Harman/Becker Automotive Systems in Martinsville, Ind.
Neville Thiele worked at EMI Australia Ltd. for 10 years designing consumer audio radio and video equipment, and with the Australian Broadcasting Corporation for 23 years, designing and assessing equipment and systems for sound and television broadcasting. His honours include the Institution of Radio and Electronics Engineers Australia's Norman W.V. Hayes Medals for best papers and its Award of Honour, as well as the Silver Medal of the Audio Engineering Society (AES). He is a member of the Society of Motion Picture and Television Engineers and a Fellow of the Institution of Engineers Australia and the AES Mr. Thiele is an active member of the ITU-R's Australian National Study Group and Standards Australia's committee on digital audio and video. More on TS design.
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