I swear that the Feedback Suppression doesn't seem to work on either of my L2t speakers. Doesn't matter if I select green, yellow or red. I could not get it to stop feeding back unless I specifically went into my ParaEq and notched out the offending frequency, whether it was at 8k, 10.1k, 4k, etc (after using an RTA to find it). I've set it up to try and "experience" the feedback suppression, but the L2t just keeps on ringing.... :(