The Active Tesla Coil is an active variant of the Tesla Coils, used in much Audio Group Denmark electronics.
Before we delve into this specific type of Coil, let's first discuss the basic principle of every Tesla Coil technology from Audio Group Denmark. The Tesla Coil is a component consisting of 2 coils, a coil and a counter coil. The counter coil is wound in the opposite direction compared to the coil. Ansuz also calls this principle the 'Double Inverted Coil'. The principle of the Tesla Coils can be understood as the principle behind noise-cancelling headphones; a noise-cancelling headphone picks up external noise at certain frequencies and then adds it out of phase to the signal, thereby cancelling out these frequencies.
The Tesla Coils do the same thing, except now it concerns electronic noise rather than literally "audible" noise such as wind or airplane engines, etc. The unique aspect of electronic noise is that you don't really hear it until you remove it; afterwards you notice that you hear more layers in the recording and that there is space and air between everything happening in the recording. The more noise you remove, the stronger this effect becomes and the more you get from the recording and truly extract what is in your music. Returning to the noise-cancelling effect, a Tesla Coil ensures that the noise passes through the coil and thereby activates the counter coil. Because the counter coil is wound in an opposite direction, it imitates the noise but out of phase, thereby cancelling the initial noise peak. One or multiple Tesla Coil(s) sit parallel to the signal path; the signal does not pass through all the coils, but rather the coils 'pluck' the noise from your conductors from the side, so to speak. All types of Tesla Coils are supportive and work together; the more Tesla Coils in your set, the more noise cancelling and the more musical the sound.
The Active Tesla Coils are actually THE Tesla Coil that one knows from the images of Audio Group Denmark equipment. Take a photo of the inside of an Aavik Acoustics amplifier and you immediately see the circuit board or boards filled with black coils. The Active Tesla Coils are, as the name suggests, active. This means that the coils are energized with a DC signal, giving them a more powerful effect. With the separate Ansuz cables and with Børresen speakers where this technology is integrated, you power these Active Cable Tesla Coils from an Ansuz PowerBox or a PowerSwitch. With Aavik amplifiers and Ansuz PowerSwitches and PowerBoxes, the active Tesla Coils are powered by the built-in power supply of the equipment, and with the Ansuz Mainz8 power distributors, the active Tesla Coils are powered by the AC power signal coming in from the power cord, which is converted to DC to properly power the Tesla Coils.
All active versions of the Tesla Coils are 3-4 times more effective at eliminating noise compared to the passive variants. The passive Tesla Coils are simpler to apply, and both versions can be combined, but the active Tesla Coils are actually only found in all electronics from Aavik Acoustics, the Forté amplifiers from Axxess, and in the Ansuz power distributors (from the Mainz8 A3 and higher), network switches (from the PowerSwitch D-TC3 Supreme and higher), and PowerBoxes (only the PowerBox D-TC3 Supreme and D-TC3 Gold Signature).