Breakthrough Proprietary Phono Equalization Grado's model PH-1 phono preamp represents the successful solution to one of the most complex technical challenges in the field of audio that Grado Labs has ever tackled. The company's design goals were to create a truly superb sounding phono preamp that would work equally well with both low and high output cartridges with negligible noise. Furthermore, the phono preamp needed to have ultra-wide band pass, high overload, virtually perfect RIAA amplitude and phase coherency, and very low output impedance.
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