BOSS PQ-4 Parametric Equalizer is a rare and powerful EQ pedal released in 1991 and discontinued in 1997. Unlike graphic EQs, it offers **4-band parametric control**—LOW, MIDDLE, HIGH, and PRESENCE—with adjustable frequency ranges for MIDDLE (100Hz–1.6kHz) and HIGH (500Hz–8kHz), and fixed bands for LOW (below 100Hz) and PRESENCE (above 8kHz).

1993 made in Taiwan. it comes with original box.

The product is sold with all functions working properly and its internal circuitry condition recorded/documented. As this is sold as “As-Described”, please feel free to contact us in advance with any questions or requests for additional photos. Accessories (power adapter, box, instruction manual, etc.) are limited to those shown in the photos. Items not pictured are not included.

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