Model #WMT1A Line Matching Transformer Lo-Z to Hi-Z Line Input Adapter - 600 ohm Matching Transformer The Bogen Model WMT1A transformer is designed especially for matching inputs from, or outputs to, a 600-ohm line. As an input-matching transformer, it may be used to connect telephone systems to most Bogen public address amplifiers for telephone paging. It also functions as an output-matching transformer in feeding program material over a 600-ohm telephone line for "music-on-hold". It is compatible with any amplifier having a 25V output terminal. Read More   $31.99