Whirlwind's transformers are the product of our desire to supply the highest quality transformers at fair prices. Constructed to rigid quality-control specifications, they are used in the most demanding audio applications in both recording and live sound. We designed our transformers from the ground up. New core and housing materials, special windings, Faraday shielding, high level-handling capabilities, and frequency response were all considerations in design. As a result, we offer three types that fit any audio transformer application. The TRHL series is designed to convert high impedance signals to low impedance, and the TRSP-1 and TRSP-2 facilitate microphone isolation and splitting. The TRSP-600 is designed for isolating and balancing line level audio signals.