KS DIGITAL ADM20, Руководство пользователя

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On the contrary, the FIRTEC actually allows the processing of the Laufzeit time lapse / run time as
well as the frequency characteristic. The correction of the input signal takes place in real time by
folding the input signal with the impulse response of the equalization filter. As opposed to analogue
technology, (that would try to correct the frequency characteristic with various filters thereby
worsening the impulse accuracy) the equalization of the ADM20 works with a direct manipulation of
the input signal to ensure absolute accuracy of the impulse – this is physically identical with a
linearization of the frequency characteristics in Betrag value and phase. Overall, a correct impulse
behaviour is responsible for an apparent sound width (spaciousness), bass differentiation and a
correct localisation of the instruments in the room.
FREQUENCY CROSSOVER OF THE ADM20
The frequency crossover in the ADM20 works with a differential filter using FIR technology. The
high frequencies are determined as the difference between the input signal and the bass signals –
this guarantees that there is always an ideal addition in the area between high and low frequencies.
At the same time, the geometric misalignment of the moving coils of both drivers is exactly
compensated utilizing a run time circuit. When combined with the newly designed sound direction
principle of the tweeter, that ensures a planar wave at the sound opening, an optimal radiation
characteristic is guaranteed. The frequency crossover’s slope steepness of ca. 90 dB /Octave
ensures no interference when listening in front of the speaker.
EQUALIZATION OF THE ADM20
To ensure the best possible equalization of the whole system, the FIR filter works on both tweeter
and bass (complete filter) – including therefore, the transition band between both. The measurements
required to adjust the FIRTEC coefficients, take place on the complete speaker system, including
crossover set-up of the drivers, so that the corrections include the complete geometry of the system.
This procedure allows an individual calibration of the system after local installation. This means
that any peculiarities of the monitoring room can be adjusted for in the configuration of the FIRTEC
equalizer. The factory default settings of the FIRTEC filter result from measurements in an
acoustically inert room whereby each individual (!) driver is calibrated. In this way, all manufacturing
tolerances have already been compensated for in the calibration. Of course, the perfect impulse
reproduction is supported by all utilized drivers. With a Qts of the mid-/bass speaker of 0.24 long
stroke and high driving power, is a distortion free reproduction of the loudest impulse peaks
guaranteed just in the same way as with the 44mm membrane diameter of the ring-radiator tweeter.
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