In my website traffic statistics I noticed a Google search for "what kind of harp does Rick Davis play?" Here's the answer: Hohner Special 20, Marine Band Deluxe, and Crossover harps. At this time all my harps are stock, out of the box.
Here is the rest of my gear, going down the signal chain:
1- Hohner harp
2- Front and Center mic w/crystal element
Thanks for asking...