The MXR M87 Bass Compressor puts studio-style compression controls into a compact pedal for bass guitar. Separate Input and Output controls set signal gain and effect level, while Attack, Release and Ratio controls shape the compression response.

Choose ratios from 4:1 through 20:1 to move from gentler dynamic control toward stronger limiting. A ten-LED meter displays gain reduction, and the blue status LED shows when the effect is active. Constant Headroom Technology is designed to preserve clear performance, while true bypass passes the signal around the effect when switched off.

The pedal operates from a 9-volt battery or a compatible external 9-volt power supply. This offer is for one White M87 pedal. An external power supply, instrument and patch cables, bass guitar, amplifier and other equipment are not included.