Echo Calls 78900 XLT Single Reed Mallard Sounds Attracts Ducks Black Gold Pearl AcrylicThe Echo Acrylic XLT(Xtra Loud Timber) Call is said to be their most versatile duck call. It will produce a Loud Ringing Hail Call that will reach out when hunting big open water. And, when you need to get soft and nasty, the XLT Timber Call will put the finishing touches on those hard to work mallards.