The Technics SH-9010 is a highly regarded vintage stereo parametric-graphic equalizer introduced in the late 1970s. Designed for audiophile and semi-professional audio markets, it allows users to precisely shape the frequency spectrum with surgical precision. Key specifications and features include : Bands & Channels : Two independent channels with 5 bands of parametric equalization per channel. Nominal Center Frequencies : 60 Hz, 240 Hz, 1 kHz, 4 kHz, and 16 kHz. Frequency Adjustment : Center frequencies can be shifted above and below nominal values (giving about 1.6 octaves of sweep), resulting in over an octave of overlap between adjacent bands. Q-Factor Control : Adjustable bandwidth/Q-factor (0.7 to 7) for each frequency band, enabling broad or extremely narrow (surgical) cuts and boosts. Boost/Cut : Provides up to ± 12dB of boost or attenuation. Performance : Very low total harmonic distortion (around 0.02%) and a signal-to-noise ratio of about 90 dB.