Klark Teknik DF1000
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Klark Teknik
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An Essential Tool for Live Sound Reinforcement: Klark Teknik's Answer to Feedback
The Klark Teknik DF1000 fits within the "field" approach of processors designed for sound reinforcement: a format designed to easily integrate into an existing audio chain, with a straightforward interface and a clear mission. Here, the goal is to secure your speeches and musical performances against feedback without imposing complex settings. The result: a processor with a decidedly professional positioning, focused on efficiency and reliability, designed to work continuously at the heart of a sound system.
Who Should Use the DF1000 and In What Situations?
The DF1000 is aimed at technicians, musicians, and service providers who need to ensure stable sound reinforcement in "high-risk" environments: conference rooms, places of worship, multipurpose halls, concerts, mobile stages, or any live sound installation. It is particularly useful when multiple microphones are open, the room acoustics are challenging, or the monitor level needs to remain comfortable for performers.
Thanks to its two independent channels, you can use it in stereo on the front of house (FOH), or split the tasks: one channel for mono front of house and one channel dedicated to stage monitors/returns. This is a simple solution to centralize feedback management without multiplying devices.
Automation, Precision, and Transparency: Feedback Suppression Without Compromise
Plug and Play Setup
The DF1000 was designed to operate without calibration : insert it inline between your mixing console and power amplifiers, power on the device, activate processing from the front panel, and let the processor react instantly. This approach is ideal when speed is essential (setup/teardown), or when multiple users take turns on the same system.
32 Filters per Channel and Ultra-Fast Detection
When feedback starts, the algorithm locates the critical frequency and automatically applies a very narrow notch filter. The DF1000 can handle up to 32 independent digital notch filters per channel, allowing it to absorb multiple feedback modes during an event (microphone movements, placement changes, level variations, etc.). The advantage of narrow filters is to reduce the problematic frequency while limiting impact on the overall timbre, resulting in a more natural sound than broad corrective equalization.
A More Stable, Louder, and More Relaxed System
Beyond auditory comfort, feedback suppression helps protect your loudspeakers and stabilize the entire mix. Practically, this translates to a possible gain increase before feedback, reported up to 10 dB, useful for regaining headroom on vocals, ambient microphones, or acoustic instruments. The DF1000 thus becomes a discreet but decisive ally, especially in reverberant rooms or setups with monitors close to microphones.
Connectivity Designed for Integration
To adapt to modern configurations, the DF1000 offers inputs and outputs in XLR and Euroblock formats. Inputs are available via XLR/6.35mm Jack combo connectors and 3-pin Euroblock at line level, while outputs are provided in XLR and Euroblock. Whether in a rack, technical bay, or fixed installation, the device easily integrates into a professional sound reinforcement chain.
Technical specifications
| Number of channels | 2 |
| U-height | 1 |
| Connections | 2 x XLR / TRS combo |
| Input impedance | approximately 20 kohms |
| Nominal input level | +4 dBu |
| Maximum input level | +21 dBu |
| Output impedance | approximately 50 ohms |
| Nominal output level | +4 dBu |
| Maximum output level | +21 dBu |
| Controls | On / Off |
| Indicators | Power |
| Frequency response | 20 Hz to 20 kHz, +0/-0.5 dB |
| Dynamic range | 104 dB |
| THD+N | < 0.01 % @ 20 Hz to 20 kHz, +4 dBu input |
| Crosstalk | < -81 dB |
| S/N ratio | > 88 dB @ +4 dBu In |
| CMRR | > 45 dB |
| Processor system gain | 0 dB |
| Additional acoustic gain | 10 dB |
| Converters | 24-bit |
| Sampling rate | 48 kHz |
| Feedback reduction method | detection and automatic application of a notch filter |
| Filters | 32 independent digital notch filters per channel |
| Filter bandwidth | min. 1/126 octave, max. 1/38 octave |
| Resolution | 0.2 Hz |
| Time to detect a feedback mode | 100 - 400 ms |
| Time to detect multiple feedback modes | 2 - 4 seconds |
| Type | automatic switching power supply |
| Mains voltage (all regions) | 100 - 240 VAC, 50/60 Hz |
| Fuse | T 1.25 A H 250 V |
| Power consumption | 10 W |
| Power connector | standard IEC socket |
| Dimensions (H x W x D) | 50 x 483 x 296 mm |
| Weight | 2.9 kg |
| Operating temperature range | 0 degC to +45 degC |
| Storage temperature range | -20 degC to +60 degC |
Questions frequently asked
Can the Klark Teknik DF1000 process front of house and monitors separately?
Its two independent channels allow assigning one channel to the mono front of house and the other to stage monitors. Stereo use on the front of house is also possible.
How many feedback suppression filters are available per channel?
Each channel has 32 independent digital notch filters. Their bandwidth ranges from 1/126th to 1/38th of an octave to target feedback frequencies precisely.
Is calibration required for the DF1000 before a concert?
No calibration is necessary: the processing automatically detects the onset of feedback and applies a notch filter. Detection of a feedback mode occurs within 100 to 400 ms.
What audio connections are available on this feedback suppressor?
Line inputs are provided on 2 combo XLR/6.35 mm jack connectors as well as on 3-pin Euroblock. Outputs are available on XLR and Euroblock, with a nominal level of +4 dBu.
What is the gain before feedback that this device can provide?
The additional acoustic gain announced reaches up to 10 dB. The processor maintains a system gain of 0 dB and a frequency response from 20 Hz to 20 kHz, with a tolerance of +0/-0.5 dB.



