On unpacking 2 of these, noticed that the mic inputs were loose on both. I suppose I should have tested pre-gig as when I fitted them on adjacent t-bars right next to the bins one of them refused to come on. Had to keep on tapping the mic with a mic boom to get it to respond. It would work for a couple of tracks then switch off again. FOr ADJ kit I'm a bit dissapointed. The effect, when working was good.