Action Filter 4 Bedienungsanleitung User Guide
EN Foreword The Action Filter 4 is a beastly thing that will rip out the best parts of your favorite tracks. Fat basses and silky highs will disappear with a single hand movement while the resonance being produced by the Action Filter 4 doesn‘t really compensate for that loss. Well, why do we build the Action Filter 4 anyway and even in its fourth generation? The answer is easy: It is a great unit.
Table of Contents Foreword...........................................................................................................................................1 Important safety information............................................................................................................3 What you should generally know......................................................................................................5 Scope of delivery........................................................
EN Important safety information The following safety precautions must be observed during all phases of operation, service and repair of this equipment. Failure to comply with these precautions or with specific warnings in this manual violates safety standards of design, manufacture and intended use of this equipment.
The manufacturer will not be liable for any claims in these cases! Opening the unit violates the warranty rules.
EN What you should generally know Scope of delivery To ensure top quality, we carefully inspected the Action Filter 4 before packaging. Nevertheless, the unit could have been damaged during transportation. Therefore, we ask you to take a serious look at the unit when unpacking. Do not hesitate to contact your dealer or us, should there be anything unusual with the unit or its packaging.
Setup and Powering Presuming there were no issues while unpacking the unit (which we of course hope), the Action Filter 4 is ready to be setup: 1. ☛ ⚠︎ Connect the provided 12 volts DC-power-supply to the Action Filter’s POWER input. When connecting the power supply, the polarity can be disregarded. The labeling on the unit‘s rear (minus = inner tip) refers to the provided power supply. It is important that the performance will not be under-run 1 A. It should not exceed 1 A as well.
EN What did you buy after all? Action Filter 4 is an analog stereo filter designed to mainly process complex audio sources. This means, full tracks or loops will be processed entirely. Be it in a DJ-setup or during studio productions, the Action Filter 4 is a lot more effective and versatile than typical Kill-EQs. We chose the word “action” in the unit’s name because the filter is always operated manually. There is neither MIDInor control voltage (CV) automation.
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EN Can a band pass through the filter or will it be rejected? What happens if you combine a high- and lowpass filter? There are two possibilities: a serial or a parallel routing - one after the other or both next to each other. In series, high- and lowpass form a so-called bandpass. In the Action Filter 4, a highpass will first remove lower frequencies. From here the signal is send into a lowpass, where higher frequencies are processed.
Now what happens with both filters being interconnected in parallel? High- and lowpass filter work as always. When connected in series to create a bandpass, the spectrum is being cut from top AND below. In parallel connection, there is a highpass filtered signal AS WELL as a lowpass filtered signal in existence.
EN ☛ Back to practice: a bandpass filter can emulate specific speaker types such as old single-chassis monitors or laptop-speakers by creating a frequency limited band and additional accents using resonances. Complex loops may be processed by a bandpass filter in order to isolate a certain frequency range - very useful for sampling. The notch filter is a useful mixing tool that allows preserving the low and high frequencies of a track.
Control elements Figure 7: The Action Filter 4’s front panel GAIN – make fit what doesn‘t fit The GAIN control sets the input level in order to match the Action Filter 4’s input to different output levels of connected units such as DJ-mixers, groove boxes, audio-interfaces etc. In case, the output level of the connected unit is pretty high by default, the Action Filter 4’s inputs may clip. This is indicated by a red LED located top right of the GAIN control.
EN MODE - small switch, large pull Each of the Action Filter 4’s channel houses a high- and lowpass filter with a slope of 24 dB per octave. As described in section "Up with the lowpass" on page 7, it is circuit-dependent whether both filters form a bandpass- or a band-reject-filter. With MODE switched to BAND, both filters are connected in series. In contrast, the NOTCH position offers parallel wiring. The MODE switch has a larger effect than it may seem at first.
Figure 8: The frequency being passed through the filter, shown as “fan”. ☛ To use Action Filter 4 as a classic lowpass filter, select BAND mode and keep FILTER A fully open (CUTOFF set fully left). Use FILTER B‘s CUTOFF to control the lowpass filter as desired. Do the opposite for getting a pure highpass filter. The filters in NOTCH-MODE The world upside down: With MODE set to NOTCH, the filters work inverted.
EN Figure 9: The frequency range being rejected by the notch filter shown as “fan” With both CUTOFF controls pointing towards each other, both filter-signals overlap which results in a slight emphasis in the overlapping area. RESONANCE - nothing to boo Resonance in a filter is achieved by internal feedback. This leads to amplification of the frequencies around the CUTOFF value. Resonance generates a change of timbre that will sound synthetic with increasing intensity.
Connections Figure 10: The Action Filter 4’s rear INPUT Input jacks L and R serve to connect the audio source to be processed. The connections are available as 1/4“-TS- as well as RCA-connectors. Both inputs can be used at the same time but you won’t be able listening to both input pair’s signal simultaneously. Both types serve to facilitate connections in the corresponding setup so there is no need to use adapters which would introduce a possible source for problems.
HDB electronic GmbH Badesteig 20 08258 Markneukirchen GERMANY Fon Email Web +49 (0) 37422 4027-0 info@vermona.com vermona.
