Electro-mechanical transducers need active protection against mechanical overload at high excursion and against thermal overload at high input power to avoid excessive audible distortion or even destruction. The nonlinear and thermal modeling combined with the permanent parameter identification of the algorithm provides a very accurate displacement and voice coil temperature estimation. Thus, the protection system can anticipate critical situations and attenuate signal components to prevent the overload. While the thermal protection reduces the level of the entire input signal to reduce the electrical power, the mechanical protection system only attenuates low frequencies where the voice coil excursion is high. Hence the maximum allowed excursion is fully utilized because the audio level can still be increased while only the excursion is restrained. This technique allows the transducer to be reliably protected without latency and avoids artifacts generated by compressors and limiters that impair the perceived sound quality.
KCS uses the transducer itself as the sensor to identify the instantaneous transducer parameters by monitoring voltage and current at the speaker terminals. While playing music in on-line mode, KCS constantly monitors voltage and current at the speaker terminals to continuously adapt the internal model with time varying transducer properties, such as variances of mechanical stiffness, voice coil temperature and voice coil position. Based on the identified parameters, the nonlinear transducer model estimates precise state information such as voice coil displacement, which is required by the protection systems.
Nonlinear and time-variant transducer parameters will cause nonlinear and linear distortion in the transducer’s output signal. KCS uses a nonlinear filter structure, which is a mirror image of the determined transducer model, to eliminate these undesired effects.
For achieving maximum sound pressure, the peak-to-peak displacement must be maximized. This requires the voice coil being centered between the boundaries. However, the voice coil position is typically not stable because it depends on softparts, which show high production variances and will change over time due to temperature, aging and other external influences like air pressure. In addition, transducer nonlinearities can cause dynamic voice coil position shifts due to instable behavior.
The Class-D amplifier unit of the active component has an intelligent power management and is able to provide the required power continuously with less than 1% THD. It is equipped with PFC for almost sinusoidal current draw on all common line voltages (90 - 264V 50/60Hz) for global use. The device also has an environmentally friendly power save mode while it is protected against DC, overcurrent and overtemperature. If no audio signal is present, the consumption voltage is reduced to a minimum. In addition the impedance of the 8” transducer is reduced to a minimum (RE < 1 Ohm) by design, where by the power consumption can be additionally reduced. A second channel of the amplifier is being used for the hf-compression driver and comes with an active X-Over with linear phase alignment.
The high frequency unit is characterized by a so-called Variable Acoustic Lens Technology (VALTEC™), which means that two variable lenses work in succession with an accurate waveguide to control the curving of the wavefront, which then leads to a wider or narrower dispersion beam. VALTEC™ makes it possible to control the vertical dispersion angle, also called vertical "beam steering". In addition, this also works in an asymmetrical mode, more upwards or more downwards, up to 30°.
When it comes to Line Array applications, a big benefit of this technology is the minimization of the comb filter effect. Because overlapping sinewaves do not have a phase shift with VALTEC™, they don't cancel each other out anymore. This constructive interference results in an average higher SPL, especially at greater distances. The Line Array configuration behaves as a true point source with cylindrical Dispersion
According to the mechanical curving of the single speaker cabinets the dispersion can be individually adjusted by a knob on the back of each loudspeaker.
A design, which reminds in its form language of the original form of a loudspeaker, but at the same time rounded and elegant, resembles a piece of furniture. Dimensions that are perceived as smaller by the eye due to curves and a play of colors, which do not impair the acoustic performance but support it. Handles, pole-mount and other mechanical components are integrated inconspicuously into the design and take on a multiple function there.
A design that is designed for longevity and has an ecologically compatible disposal concept in mind right from the start. Much work has gone into researching and testing new materials in order to break new ground in the field of sustainability. Often the details matter. The use of exclusively ecologically harmless wood glue, or the use of cables without halogens, are just one example of many others.