Hi-Z Microphone Preamplifier
The dbx 570 is a quality variable impedance microphone preamplifier in a 500 series format module. The 570 provides a wide range of tonal color and can bring fresh sonic possibilities and new life to any microphone. The 570 Hi-Z is a powerful tool that will expand your microphone’s tonal scope and provide incredible audio excellence.
These merchants probably sell this module. Huh?