Klark Teknik DF 1000

18

Two-Channel Feedback Suppressor

  • Fully automatic operation with configuration-free setup
  • Provides up to 10 dB increase in system gain
  • Instantly detects and stops acoustic feedback
  • Fast and precise DSP selects and applies up to 32 filters per channel
  • Two fully independent audio channels for processing stereo or separate zone signals
  • Extremely narrow filters (down to 1/30th octave) to maintain overall signal integrity
  • Front-panel control with suppression and filter reset buttons
  • Two balanced/unbalanced inputs - line-level XLR/TRS combo and 3-pin Euroblock connectors
  • Automatic 100-240VAC universal Switched-mode power supply
  • Dimensions (H x W x D): 50 x 483 x 296 mm
  • Weight: 2.9 kg
Available since June 2019
Item number 466332
Sales Unit 1 piece(s)
Channels 2
$179
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Just say no to feedback

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.

32 filters for zero feedback

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.

Ease of use guaranteed

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.

About Klark Teknik

Founded in 1974 by brothers Terence and Phillip Clarke, Klark Teknik designs and manufactures professional audio equipment used primarily in the events industry. Based in Kidderminster, Worcestershire, UK, the company has developed a number of innovative products in the audio field (including the DN60 Real Time Analyzer and the DN300 Graphic Equalizer) and it won one of the Queen's Awards for Enterprise in 1986. Today, the firm (along with Midas) is owned by the Music Group, to which Behringer also belongs.

Integrated Euroblock connections

In addition to the input and output sockets in XLR format, the DF 1000 also has four three-pin Euroblock connections on the rear. Just like XLR sockets, these connections have ground, plus, and minus contacts. Euroblock connectors are often used in audio equipment because of their low cost and compact dimensions, as these attributes enable a variety of possible connections. In the case of the DF 1000, they are connected in parallel and accept balanced as well as unbalanced signals. Thanks to these additional connections, users are provided with flexible input and output options. Power is supplied to the DF 1000 via the included IEC power cable.

18 Customer ratings

4.4 / 5

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13 Reviews

A1
EXCELLENT, AUTOMATIC, FOR NON-TECHNICIANS. REMEMBER: DON'T OVERLOOK WITH VOLUME, A VERY BIG LARSEN WILL NOT STOP IT.
Alessandro 1965 25.04.2023
... perfect for non-technicians, very narrow filters, does not alter the sound. Mounted in a church, its job does, even if I was hoping for a little quicker time. In my case, one channel to the choir mixer, one channel to the priests' microphone mixer. output to a stereo power amp, left channel for priests voice, right channel for choir mixer. Church lenght 50 meters! It works, but be careful not to exaggerate the volumes...if the LARSEN is too loud, the device is not able to stop it...and in that case you need to reduce the volume quickly, before the speakers are damaged! ! Don't wait!! For me, a good practice is to keep the volume just high enough to cause little Feedback...at which point the device works properly. When you heard the filter "kicked in", at that point you can slightly lower the volume to be even safer. What I didn't understand is if the device ALWAYS keeps the filters in its memory, even if you turn it off and on again...sometimes, when it's turned on, it behaves as if I had pressed the reset button...but this, only if I turn on with the amplifier volume very high. Overall, GREAT. It promises up to 10 db of output, I think I earned 9!!
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audiodes 25.07.2021
Used one of these in a Church Sound installation and I must say very easy to use and set up. It works well and gives the system a lot more gain and control of feedback. Would recommend and will use again and good value for money.
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f
Funktioniert, ist aber raumabhängig
fishsoft 22.01.2021
Ich habe das Gerät beschafft für technikerlose Beschallung. Es funktioniert grundsätzlich, aber Wunder sollte man von diesem Teil nicht erwarten. Es ist eher als Sicherheit gedacht. Am besten ist es immer noch, durch Wahl der Mikrofone und Standorte, dafür zu sorgen das keine Feedbacks entstehen. Was ich festgestellt habe, ist das die Funktion sehr stark abhängig ist von den vorhandenen Räumlichkeiten. In normalen Räumen klappt es gut, aber bei uns in der Kirche hat der Supressor echte Schwierigkeiten durch den Hall und durch die Echos. Es entsteht erst einmal eine Pfeiforgie, wenn ich eine Rückkopplung absichtlich provoziere. Irgendwann schafft es dann die Kiste dem Pfeifen ein Ende zu setzen, das dauert aber. Nicht so, wie in den technischen Daten beschrieben bei einfachen Rückkopplungen im Milli- und bei multiplen im Sekundenbereich, das kann dan schon mal 30 Sekunden dauern (zumindest in unserer Kirche). Was dem Teil fehlt, wäre eine Anzeige wieviel der 32 Filter schon belegt sind. Dann hebt der DF 1000 den Ausgangspegel nach dem Einschalten etwas an, so dass man da mit Rücknahme der Verstärkung gegensteuern muss. Der Signal-Rauschabstand könnte etwas besser sein, es ist doch im Hintergrund etwas Rauschen zu vernehmen, welches verschwindet, wenn der DF ausgeschaltet wird (dann wird der Ein- Ausgang hardwaremäßig durchgeschaltet). Durch die vollautomatische Funktion ist der Supressor auch von Laien bedienbar, das ist ein klarer Vorteil. Es sind ja nicht alles Tontechniker, die bei uns am Werke sind. Ich kenne mich zwar etwas aus, bin aber auch kein Profi. Was gibt es noch zu sagen? Das Netzkabel ist mit 1,5m etwas kurz geraten. Das habe ich durch ein lägeres ersetzt.
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JW
Déçu : Peu efficace
Jean-Marc W. 15.06.2021
Ne correspond pas à mes attentes. J'espérais que cet appareil puisse me permettre d'augmenter le gain de près de 10dB comme annoncé dans la pub, il n'en est rien... Je règle le niveau sonore à la limite inférieure du larsen avec l'appareil éteint. J'ai parfois des accrochages selon ma position devant le micro. J'active l'appareil, c'est à peine mieux, et toujours des accrochages, même s'ils sont moins violents. On entend que l'appareil enclenche des filtres, mais leur efficacité n'est pas là. J'ai ensuite commandé un DBX, plus cher, pour comparaison, mais la procédure de réglage du DBX, pourtant bien faite, a détruit mes tweeters, car trop lent à mettre en place ses filtres (plusieurs secondes) ce qui est un comble pour ce type d'appareil sensé protéger les tweeters... J'ai donc aussi retourné le DBX, car là, carrément pas content, j'ai 2 enceintes à réparer maintenant...
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