I have been struggling to amplify my harp for a while. I have used expensive microphone, etc, but the faff of caring these, and them sometimes falling onto my soundboard, etc, were really annoying.
I bit the bullet, after reading a quick article online about the CH-3's and I bought one. OMG, I should have bought mine ages ago.
It was installed within 5 minutes, with no drilling necessary.
It amplifies the harp beautifully and evenly.
It's basically now fully installed inside my harp and I don't have to worry about mics and amplification anymore. All I need is a guitar/instrument lead and BANG, my harp can be amplified. I LOVE IT.