- Matching Transformer Line Input- Used as an input-matching transformer it connects telephone systems to most public address amplifiers for telephone paging. In addition it functions as an output-matching transformer to feed program material over a 600-ohm telephone line for music-on-hold . It is compatible with any amplifier having a 25V output connection.- Hi-Z 10k-ohm primary impedance- Lo-Z 600-ohm secondary impedance balanced with center tap- Matches high-to-low impedance or low-to-high impedanc