I am an audio engineer for charity choir performances and sometimes it is very hard to control feedback in rooms. So I decided to buy ASF2 and now I made sure that without DBX we could not achieve such a good results in some spaces. Yes, it is not a magic wand and you need to set it up properly for fixed and live filters, gain staging and all the parameters. But in the conclusion you will be rewarded and public stay happy. The choir performances done with small diagramm condenser microphones on some distance from mouths so the acoustic feedback is a very big problem for them. Thanks Thomann and DBX. You make our lives easier.