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Over five years ago, Kalkmann Audio decided to start developing a speaker that is capable of reproducing the entire audible frequency range without using passive filters.
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The following conditions were stipulated in advance:
* no use of electronic components, like a classic or passive filter as conventionally used
* use thin materials in construction of the speakers
* absorb vibrations depending on frequency, by means of an internal mass in the speaker casing
Using these conditions as a starting point in our development we created a speaker with a signature sound and form.
The classic passive filter, consisting of electronic components, was replaced with our patented Kalkmann Audio acoustic filter. This filter consists of a material that doesn’t absorb sound waves, but instead resonates freely with them. The operation of our filter is based on air pressure and thrust.
All our speakers are fitted with two identical speaker units (or “drivers”), which together cover the entire audible frequency range creating a full range output. Both speaker units are built into separate chambers of a different size, which are almost completely sealed off.
One speaker unit is built into a relatively small chamber, limiting the speaker unit’s motion in such a way it mainly reproduces the higher and middle frequencies. The other speaker unit’s chamber is twice as large, leading to reproduction of the middle and lower frequency ranges.
Because no electronic components are used in the filter, there are no cross over sections nor fall out sections in the output.
A bass reflex port is situated exactly behind the unit in the larger chamber. This position has several advantages and is based on the theories of Helmholz (1821 – 1894).
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