Shure A95UF - Line Matching Transformer for 75 to 300 Ohm Mics - In-Line XLR Female to 1/4" (Jack and Plug) BarrelThe Shure A95UF is a reversible transformer that matches low impedance microphones to high impedance inputs or high impedance microphones to low impedance inputs. The transformer permits use of very long microphone cables with either low impedance or high impedance microphones. The only requirement is to limit the cable to 4. 6 m (15 ft) between the high impedance end of the transformer and the low impedance microphone or microphone input. The