DRT Calls. Our Acrylic Echo DRT(Double Reed Timber) Duck Call is Echo’s newest Double Reed Timber call. Great for medium to close up calling. Ducky tone yet, easy to operate for beginners or seasoned hunters. This call is excellent for the hunter looking to start calling. If you’re new to duck calling and plan to hunt in the timber, then this is the call we recommend for you. The DRT is great for a finishing call because it can get extremely quiet. Works excellent even in late season hunting when ducks are more skittish. The Echo DRT could be the first and last duck call you ever buy!