There is a known issue with this product. On channel 2, the sliders for 40, 125, and 400 Hz are loose and don't function properly. Despite this, the ART EQ - 355 dual - channel 31 - band graphic equalizer can still bring a certain audio adjustment experience.

To use the ART EQ - 355 equalizer, first connect it to your audio system. You can adjust the sound by moving the sliders on each channel. However, be aware that on channel 2, the 40, 125, and 400 Hz sliders are loose and may not work well. When you're done using it, turn it off properly. For maintenance, keep it in a dry and clean place. Don't expose it to extreme temperatures or moisture. If you notice any other problems, it's best to consult a professional.