The Pioneer GR-555 is a classic 7-band stereo graphic equalizer from the 80s and 90s. This component is designed to precisely match the sound reproduction of hi-fi sets to room acoustics or personal preferences. The device is technically identical to the silver-colored Pioneer GR-551, but executed in the then popular black. Key Features 7 Frequency bands per channel: Manual sliders for the frequencies 60Hz, 150Hz, 400Hz, 1kHz, 2.4kHz, 6kHz and 15kHz. Built-in Spectrum Analyzer: A visual display that shows the sound level per frequency band in real time via illuminated bars. Flexible Connections: Equipped with RCA (tulip) inputs and outputs for an amplifier and an additional tape deck (for recordings with or without EQ correction).