The DBX 1231 Dual Channel 31-Band Graphic Equalizer is a professional audio equipment designed for precise audio calibration. With switchable 3U EQ capability, this model offers adjustable equalization for a smooth and balanced sound. The black-colored unit features XLR audio inputs and a variety of audio outputs including a headphone jack, stereo L/R RCA jacks, and raw cable speaker jacks. Ideal for home audio setups or professional recording studios, this DBX 1231 equalizer is a reliable choice for achieving optimal audio performance.