The devices meet expectations: precise frequency response adjustment. It works well both when listening to music and at band rehearsals. At this price you are unlikely to get anything better, unless some used equalizer with an unknown history." Recommended for anyone entering the world of musicianship or music recording. Of the downsides, there are four things related to the ergonomics of use: 1) using the on/off switch on a rack-mounted unit is inconvenient - the switch is on the back panel and when connecting cables it is hard to find it. 2) mechanically and electrically the sliders are correct, but they lack softness and their middle position is not always well felt. 2) the bass cutoff potentiometer for the subwoofer is on the back and it is difficult to set the cutoff frequency with it (you can't see the scale), yet it is used quite often when changing music styles. Probably it is better to connect the subwoofer to the amplifier. 4) the LEDs on the faders shine evenly, but when looking from above or below, some are partially obscured by imprecisely made fader caps and seem to shine unevenly. In conclusion - at this price I recommend the device. This is my first equalizer. It works with the UCM1820 and the ADA8200. It seems to make no sense to spend more money at the beginning, when the end is not sure if it will be useful. When mounting in the rack, it is worth leaving space between the equalizer and other devices - after a few hours the equalizer gets a little warm.