Advanced Feedback Suppression (AFS) Each channel has 24 programmable filter, stereo or independent dual channel processing, selectable filter disengaged time, the type of filter applications, including: language filter, low, medium, high, 3 sections of music filters, input channel measuring meter, per channel 24-segs filter meter, electronically balanced input and output ports XLR and TRS, allowing users to eliminate acoustic feedback as perfectly as possible.