This EQ was everything I hoped it would be and more. I have QSC K12's for my PA at home in a pretty small space. Feedback was a huge issue for me. I have fedback detection on my dbx driverack pa but that is a little difficult to use and although it helped it was I felt taking too much of the frequency range out. The HQ-231 does exactly what it says it would do by telling you the problem frequencies and allowing you to manually adjust it. WOW!!! Tons more game and clarity like never before.And the lights are cool too.Yuk Yuk.