The SP-4 is a high-reliability audio transformer designed for impedance matching in demanding audio applications. It operates at a 10 mW power level, matching a 200,000 Ohm center-tapped primary to a 1,000 Ohm center-tapped secondary. This transformer features a frequency response of ±2.0 dB from 300 Hz to 100 kHz and has a turns ratio of 14.1:1.0. Housed in a durable epoxy-molded case with gold-plated nickel alloy leads, the SP-4 is built for precision and reliability in a wide variety of designs.