Klark Teknik DF 1000

Klark Teknik's DF 1000 is a professional audio processor for feedback suppression in a 19" rack-mountable format that instantly detects acoustic feedback and automatically suppresses it using an internal algorithm. The processor handles two independent audio channels for stereo signals, which can also be processed as separate zone signals. With just three buttons, the DF 1000 is particularly user-friendly and can be operated even by non-professionals. The rear panel features XLR connections as well as three-pin Euroblock connections for signal inputs and outputs, and the DF 1000 is suitable for both vocal microphone signals and musical performances.

At the heart of the DF 1000 is a highly accurate digital algorithm that detects critical frequencies in both of the input signals and eliminates them using up to 32 filters per channel. All of the filters are designed as extremely narrow notch filters with a filter width of up to 1/30 per octave, while the rest of the signal remains unaffected. The DF 1000 thus removes feedback accurately without excessively affecting the original signal. To create more headroom in the overall signal, the DF 1000 can increase the output gain by up to 10dB. The Active button on the front panel activates the feedback detection algorithm. When the DF 1000 is completely switched off, connected signals pass through unaltered, and the Reset button resets the internal filters and clears the memory.

The DF 1000 declares war on feedback with its highly accurate algorithm, which will capably handle a wide range of situations ranging from clubs and concert halls to conference rooms and churches. The unit's practical 19" rack format also means it can be integrated into any professional touring rack, and the fully automatic DF 1000 requires no complicated advance setup. Once the DF1000 is installed in line between the mixing console and power amplifiers, all that remains in order to activate the processor is to press the Active button. To ensure that the algorithm will respond to new critical frequencies, the Reset button should be pressed beforehand. After these simple steps have been taken, the audio processor immediately begins to effectively suppress feedback.