Guitar Center has all of your dtar needs. Dtar is a brand name and an acronym that stands for Duncan Turner Acoustic Research. Dtar sells pickups, preamps, amplifiers, accessories, and more. Guitar Center currently has a wide variety of Dtar brand products for sale. The best sale right now is the Dtar Mama Bear Digital Acoustic Guitar Preamp, which is on sale for $349.30! Free shipping on orders of $25 and over. Free shipping to stores. Find a location near you.