Shure A95U - Reversible Impedance Line Matching Transformer - In-Line XLR Male to 1/4" Phone (Plug and Jack) BarrelThe Shure A95U is a reversible transformer that matches low or high impedance microphones to high or low impedance inputs. The transformer permits use of very long microphone cables with high impedance microphones. However, when connecting a high impedance microphone, limit the cable length between the microphone and the transformer to 4. 6 m (15 foot). The cable from the transformer to the low impedance input can be any desired length. The