Entferner LE is a mono, resonant, and self-oscillating 12dB low-pass filter.
It is a simplified but more aggressive sounding version of the Entferner L.
Entferner filters, in general, are based on a cascade of very versatile 6dB filters. In the case of the Entferner LE filter solely two of the filters are used, and the algorithm is tuned to be capable of an even more aggressive sound when activating the resonance color mode.
Since the filter is using internal saturation, the sound is highly dependent on the input voltages. Red LED lights beside the ports indicate any voltage overdrive. If the LED is blinking from time to time, the filter is operating in its sweet spot. If the LED is continuously red, the filter will still work but might result in a harsh sound or unwanted behavior.