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Veliki Horn is our ultimate speaker. It employs not only old knowledge in a new way but also orthodox views and solutions, making it revolutionary in few aspects - as much as this term can be used for something with basic principles dating back a few centuries. Briefly, it's a back-loaded, back-firing horn of combined expansions totaling over 4m in length.

The use of multiple expansions is the one thing that sets it apart from all other known back-loaded horn designs. This means Veliki is not one horn, but a horn system made of 3 sections of different expansion profiles where the throats of the final two sections begin from the mouths of the previous sections. The reason why it was done this way was an attempt to design an inverse filter system for the non-uniform driver response (all high efficiency drivers have non-uniform responses, both absolutely and relatively), this way achieving a speaker system having a uniform, balanced frequency response. As it turned out, this was possible and a BIG success, otherwise you wouldn't be reading this and it would all have remained just an idea that didn't work out.

Another 'revolutionary' thing here is avoiding the use of "progressive" expansions like the tractrix. The sections of Veliki are all closer to conical then to tractrix calculations. The reason for this is the unnaturalness of the 'tractrix sound', which maintains low frequency output with less expense (read length), but then drops like a stone. This sounds very unnatural, this sudden drop, and the decision was made to experiment with more conservative expansion curves, 'wasting' some length. This is also something you wouldn't be reading about if it didn't prove a real success. Slow falloff below 40Hz, with some usable output at even 20Hz makes this horn sound "natural, effortless, easy..."