I had a 29 string Blevins Eden which I had a K&K single pickup installed by the builder when it was built. You plug in with a short cord to a small simple pre-amp (which allows the K&K to work at its optimum) K&K sells them, and plug the pre-amp with longer cord into any sound system (or PA system). If your speakers are “IN FRONT” of your harp, you will not get feedback. This little setup works great! And it’s simple…You can put it in yourself using a Dusty Strings Jack Clamp (that clamps in the back of your harp inside and outside of one of the holes that is removable — no holes drilled into your harp), or find someone to do the permanent install who has done this sort of thing before. The sound is just fine with a harp this size. Any bigger, I would recommend the K&K “Big Twin”, 2 pickups placed inside against the soundboard instead of just one, which I used in my 36 string Pratt Chamber Harp, and it worked great. Not too expensive at all 🙂