Ashdown RMMAG420 420w Rootmaster Head, Sub Harmonics, Compression and Overdrive, DI, FX Loop Flexible, lightweight, and high powered bass amplifier Built-in compressor and foot switchable overdrive for added punch and growl On-board Sub-Harmonic effect for added depth (foot switchable via optional FS-2 footswitch) Comprehensive five-band rotary EQ; Shape function boosts high and low frequencies Balanced XLR Direct Out; Effects Loop; Auxiliary Line In with Mix Control