Description: The new SP4001 signal processing preamplifier is the most flexible preamplifier available. Its push button patching capabilities are endless. The SP4001 was designed for those audiophiles who take a hands on approach to their equipment. For tonal flexibility, we have included two ten octave graphic equalizers. For the tape enthusiast, the SP4001 is capable of handling two tape recorders with 2 way dubbing control. Along with this are two signal processing loops for added accessories, a subsonic filter and stereo/mono mode switching.