A speaker design software is a computer application that is developed to assist the designers of speakers in bringing out the best designs that will have various effects. Essentially, the software in this category will pick all the components of the speaker being developed in terms of measurements as well as the type of materials being used. Design a 3-Way All Pass Crossover for your next Speaker Project. DIY Audio & Video Tutorials, FAQs, Calculators and Examples for Speaker Boxes, Crossovers, Filters. Main program VituixCAD is free engineering and simulation software for passive and active multi-way / multi-driver loudspeakers. It is one of my DIY projects and personal challenge in programming, acoustics and mathematics. Program provides some important features which are not available in every speaker simulators on the market. Providing subwoofer design software programs for solving the required calculations for custom bandpass, sealed and vented box cabinet designs. Can be used for car, truck, sport utility vehicle (SUV), Jeep automotive, guitar and home theater applications and projects.

Technical documentation

2006-02-19

The Edge program is a baffle diffraction simulator. Typically it is intended to use for estimation of the 'baffle step' that occurs when a loudspeaker is mounted in a baffle of finite size. It is common that the baffle step is approximated with a pole-zero pair to approximate the 6 dB raise towards higher frequencies. The Edge uses the geometrical theory of diffraction (GTD) to estimate this transition better.

The Edge is and will probably remain a pure baffle diffraction simulator. The results from the Edge should of course be added to other properties of a loudspeaker system, such as those described by Thiele-Small and others and also the effects of crossover filters etc, such as can be done in the Basta! loudspeaker simulator (http://www.tolvan.com/basta). The Edge can simulate a simple baffle step compensation, or an open baffle bass drop compensation, but that is probably as far as the development will go. The edge can also export the response data in text format, for further use in other programs.

https://aaayellow.amebaownd.com/posts/19582188. The Edge has a home page at http://www.tolvan.com/edge

Suggestions and opinions both on the program and this documentation are happily accepted by edge@tolvan.com

Baffle designer

With the baffle designer, the dimensions of the baffle are entered into the Edge, the loudspeakers are placed on the baffle and the microphone is placed in front of the speaker system. The baffle shape is determined by a number of corners, and they can either be dragged with the mouse to for the shape of the baffle, or they can be moved to form a baffle with a width and height as defined in the 'size' group box.

Figure 1. A baffle of size 300 x 500 mm, with the loudspeaker placed slightly to the right. The Edge models this particular system by means of one point source at the speaker centre (blue), and 36 sources (green) of opposite sign at the baffle edge (red). Free autocad dwg blocks lighting. The microphone is in the far field (100 m away), so the positioning of the 'mic' symbol has little effect in this case.

Up to 50 drivers can be placed on the baffle, and each of these is modelled by a set of point sources and their mirrors. The 'speaker source density' spin box determines the number of point sources used per driver. Increasing this number is essentially a way of modelling the speaker directivity. It does not, however include cone break-ups, since all of the sources are of equal magnitude and phase. Each of these point sources has an amplitude of 2, corresponding to the sources and their mirrors. For each of these sources, a number of edge sources are placed along the edge of the baffle. The sum of these sources has an amplitude of -1. The edge sources are distributed along the edge of the baffle such that each edge source represents the same angle, as seen from the driver source(s). As can be seen in Figure 1, this method automatically results in a higher edge source density when the driver is placed near the baffle edge and that each source can have the same amplitude. In the case of the open baffle the amplitude of the edge sources is doubled, to model the diffracted radiation from the back of the driver. The number of sources used in the simulation can be large, and this may slow down the calculation of the response. Some experimenting with the number of edge sources and speaker source density is recommended. In general, a higher number of sources are needed for a more accurate simulation of higher frequencies. The response is normalized so that the sum of all driver sources corresponds to 0dB if they had been located at the same distance to the mic.

Driver shape

The driver shape option can be used to simulate drivers of circular, elliptical, square and rectangular shaped membranes. In order for the shape option to have any effect the 'Speaker source density' has to be 2 or larger. The Edge spreads out a number of point sources over the area covered by the membrane. The rectangular shape can also be used to approximate an array of equally spaced loudspeakers. This might be convenient during the design process, since the whole array easily can be moved on the baffle as if it was one speaker.

Response

To simulate the frequency response of the system, all of the point sources are added taking the distance to the microphone into consideration. The distance will affect both the phase and magnitude of each contribution to the summed signal. The resulting frequency response is shown in the response window.

Figure 2. The response of the system in figure 1 (red). This graph shows the response as a function of the frequency. Above the graph, the wavelength is also shown. The blue curve shows the effect of compensation, which is not used in this case.

Note: To change the axis scaling, simply drag it with the mouse. There are three zones on each axis, which enable either stretching or moving of the scale.

The help menu in this window can open the home page of the Edge. Here you can find this document and also download the latest version of the Edge.

Compensation

The Edge can apply two types of compensation to the response curve. The first is used for boxed systems, and the other is used for open baffle systems. There are other circuit configurations than the suggested ones that give identical responses.

Figure 3. Compensation of the diffraction effects. The Edge can simulate the effect of two commonly used types of diffraction compensations.

Baffle step

For boxed systems, it is common to compensate for the baffle step by means of a pole-zero pair. In the Compensation designer such a pole-zero pair can be entered as the 'corner' frequencies f1 and f2 in the response. By entering a resistor value, R1, some help is provided to design the compensations circuit. Either of circuit 1 or circuit 2 can be used, circuit 1 is probably best fit for passive filters, and circuit 2 is best fit for line level filters. The Edge suggests values for L and R2 for circuit 1 and C and R2 for circuit 2.

The Edge can suggest values for the f1 and f2 frequencies. It does so by numerically finding the frequency where the far field baffle response has increased by sqrt(1.25/2) or approximately 2 dB. The Edge takes this frequency as f1 and twice this frequency as f2.

Open baffle bass loss

For the open baffle ('dipole speaker') there is a tilt of the frequency response of 6 dB/octave. This can be compensated for by an active line-level bass boost. The Edge can simulate the effect of adding such a network. Like the baffle step compensation, this compensation is added by entering two 'corner' frequencies, f1 and f2. The lower frequency f1 will be the lower frequency limit of the system (neglecting the response of the driver), and f2 should be set to the start of the bass drop of the baffle design. Again, some design help is provided if t

Speaker Design Software