LspCAD 6 is a software intended for the design of loudspeaker boxes and crossovers.


LspCAD 6 comes in two versions
  • LspCAD standard , a standard version with some limitations in features
  • LspCAD professional, the full version with all features enabled.


With LspCAD 6 it is possible to model loudspeaker boxes, passive crossovers, active analog and digital crossovers.

A nice feature is that it is possible to model everything at the same time, i.e. there is no need to do box modeling first and crossover modeling later, this makes prototyping of new projects easier.

Crossovers and boxes are created from a tray of components, the components are picked from the tray and dropped of the schema. This allows for a large degree of freedom for the user, on the downside is the problem that the design procedure may become more tedious. To alleviate this potential problem, the concept of network sets is implemented. Additionally a set of Store/Recall buttons makes it easy to make rapid comparisons of different designs. Another concept that simplifies designs is the group concept where one can simply group a number of components and later with a simple mouse click change on one set of component values to another set and see the results of the changes instantly. Moreover a number of filter templates are available some of them with wizard functionality which makes it easy to tune the components for desired properties

The boxes are designed with building blocks such as ports, cabinet volumes and driver units. For well-known box types a special wizard functionality helps the user to pick an optimal alignment for the given driver, each radiating part of a loudspeaker can be linked to a baffle component that makes it possible to model baffle diffraction and reflections from the closest walls in a listening room

Crossovers that can be implemented are besides analog pass and active filters also digital filters with unit delays and sum units. A paradigm that makes the initial prototype modeling simpler is the parameter mode that allows the user to modify parameters such as crossover frequency and Q value rather than having to fiddle with component values. A generic filter component allows, among other things, for the modeling of LP/HP filters of various filter order, pole-zero or directform filters imported from eg. Matlab or Octave, digital BiQuad filters, FIR filters, also a digital equalization filter component makes it possible to invert the frequency response of a  given loudspeaker unit in order to achieve a ruler-flat response in the driver working range.

Components for well-known commercial digital filters such Behringer, dbxPro and XTA is implemented and also optimized.

To be able to achieve a given target frequency response a powerful crossover optimizer can be used. This optimizer also gives the option to put constraints on things such as component values and resulting load impedance, the unique feature of the load impedance optimization is that it actually can increase the load impedance while maintaining the desired frequency response. Another feature is that one may lock the crossover frequency during the optimization.

The tolerance analysis helps to give a view of how the resulting frequency response of a crossover deviates from the original response once we add the possibility that components might deviate from their specified values.

Finally the powerful crossover emulator (or auralizer) is a good companion when it comes to evaluating crossovers.

The popular real time update feature in LspCAD 6 gives the user a "What you see is what you get" feeling as the graphs are updated each time one change e.g. a component value. Similar to earlier releases it is possible to store intermediate work.

The following pages try to highlight the possibilities with LspCAD 6, it is also recommended to download the demo and try it + read the manual in order to get a deeper insight in what LspCAD 6 can do.

For those who liked LspCAD 5.25 a lot, rest assured. LspCAD 5.25 comes bundled with LspCAD 6.

LspCAD comes with a USB copy protection dongle.

PC requirements (recommendations)
  • Windows 2000, XP, Vista, Win 7, Win 8
            32 and 64 bit versions supported  !!
  • Screen resolution 1024x768 or better is recommended
  • 256MB RAM, 512MB recommended.
  • USB connection (for copy protection dongle)
  • Direct X 8.0 or later installed
  • For justMLS and emulator: A good audio device with real ASIO drivers
            Example: Edirol UA101 or UA25

NOTE. LspCAD 5.25 is reported to have some stability issues in 64 bit OS, LspCAD 6 works flawlessly however.

LspCAD 6
BodiLizer
The BodiLizer is an instrument body equalizer. The purpose is to bring back life to the sound from e.g guitar pickups.

Especially under saddle guitar pickups suffer from a very "dead" sound, the reason to this is simply put that while the under saddle pickup picks the string vibration quite well and also is quite robust to outside noise and acoustic feedback it does not manage to provide for the box sound at all.

The BodiLizer is a VST plugin that can be used with e.g Steinberg Cubase or Wavelab or other host applications that support VST technology. It filters the signal from the guitar pickup so that it sounds more like a it is picked up with a real microphone.

The benefit of using the BodiLizer instead of a real microphone in a studio is that it is much more easy to use the built in pickup in the guitar, also the guitarist does not need to sit pinned down to a chair during the recording session.

In a live situation the benefit is obvious as the built in guitar pickup (especially if it is of under saddle type) is much more robust to acoustic feedback than an outside mic is, on top of this the freedom of movement for the guitarist becomes much improved.
It is possible to use the BodiLizer with other guitar pickups and also with electric guitars if one wish to give the electric guitar an acoustic touch.

Other applications are to use the BodiLizer with e.g plucked string synthesis.

Get your free copy of the  BodiLizer here




1000 thanks to Multree for the help with the GUI and Perry R. Cook at Princeton for the instrument measurements.


Want to create your own BodiLizer impulse response for your favourite guitar, fiddle, violin or banjo or whatever ???. Get the beta of the BodiLizer impulse response tool here

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