captdistraction said:all of mine are powered and still end up low on gain. I'm not sure if its a gopro thing (is there a gain adjustment for external mics?) on a canon DSLR, they work great. My main one is a audio-technica pro 24cm, which makes a world of difference. I tried a sony one that was similar to the above for a while, really enjoyed it as well (though in some karting videos, it was sensitive enough to pick up some of my foul on-track language)