A bass amp legend with a reputation built on reliability, punch, and unmistakable GK growl, the Gallien-Krueger 400RB has been a favourite of gigging bassists since the 1980s. Designed as a more compact sibling to the iconic 800RB, the 400RB delivers fast transient response, tight low end, and a cutting midrange character that sits perfectly in a live mix. Despite its modest power rating on paper, the 400RB is renowned for sounding far louder than expected, making it a dependable choice for rehearsals, clubs, and touring alike.
Its straightforward control layout offers plenty of tonal flexibility, from clean, articulate sounds to the aggressive, slightly gritty edge that became a Gallien-Krueger hallmark. Whether paired with a modern cabinet or a vintage 4x10, the 400RB remains one of the most respected solid-state bass heads ever produced, prized for its rugged construction, roadworthiness, and instantly recognisable voice.
