June 2010 AudioXpress article by Bohdan Raczynski

[David Brown]

Using the example of a guitar speaker in a vented box the designer of SoundEasy V17 software describes how to apply dsp filters to correct irregular frequency response and phase issues in order to be able to accurately reproduce square waves. I assume that this is quite different and more sophisticated than using something like a Behringer DCX2496? Once these measurements have been made and the required filtration applied shouldn't the benefits of more accurate reproduction be consistent in any location? Other corrections to account for room acoustic problems could then also be applied as needed. Bohdan's software requires a pc and soundcard which would be ok if it was being used for pa applications but for applications where dsp might be considered in a single guitar or bass cabinet I wonder if it might be possible to make a dedicated board that could be programmed to provide these corrections and also provide cross over functions in the case of a two or three way enclosure? With the addition of a built in power amp this could be a much more economical equivalent to current commercial designs like the Bergantino Ip Series which I have heard raves about.

[horst]

I wonder if it might be possible to make a dedicated board that could be programmed to provide these corrections and also provide cross over functions in the case of a two or three way enclosure?

wonder no more
http://billfitzmaurice.info/forum/viewt ... =4&t=11494



PS: wrong forum

[David Brown]

Thanks Horst. These mini dsp boards should be just the thing for the job. Now I'm wondering if a speaker like the Jack 10 for instance was built using the preferred driver and exactly according to the plans would there be enough uniformity in the design to be able to use a dedicated set of measurements for all the phase, frequency response and crossover data to avoid builders having to do all these measurements for each individual cabinet? Perhaps individual drivers have too many variables to allow this? Sorry for choosing the wrong forum for this thread. Perhaps Mark could move this topic to the proper location?

[horst]

yes there is enough uniformity

the benefit of the active crossover is that you can use a wider range of drivers and not having to deal with the problems like phase that passive filters throw at you
the complication of course is that you need a second amplifier, but it has by rights to sound much better