I have a pair of this equalizer for many years.
The sound is very different equalizers frequency slippery.
We choose the frequency with one push button. Then we choose the gain with another button.
The sound is amazing, very deep bass and very musical midrange. As for the treble, they are gentle and very precise. It adds warmth to everything that goes into it.
However, rather s'adesse sound engineers who have some experience because you have to know the frequency to be processed.
Indeed, it is impossible to search the bandwidth frequency hoping to find work.