Several of us are away at the Somerset Folk Harp Festival, and we may not be able to respond to emails and phone calls as quickly as usual. Thank you for your patience!
The L.R. Baggs Para Acoustic D.I. is both a preamp with EQ and a direct-in box. The preamp will boost the amount of signal going to your amplifier, allowing for a cleaner sound with a wider volume range. This is especially useful if you have a small or inexpensive amplifier. You'll also have easy control over the EQ, so you can fine-tune the balance across the range of your harp. The XLR DI output is useful for connecting a Hi-Z 1/4" cable to a PA system, which will typically have Lo-Z XLR inputs. You may need this feature if you are using the Dusty Harp Pickup and regularly need to plug into a PA instead of an amplifier.