The grand-daddy of lightweight bass amplifiers, the GK 800 RB is particularly favoured by Jazz artistes, often in conjunction with Hartke 410XL , Hartke 115XL or Ampeg SVT 410 HE bass speaker cabinets.

The 800 RB has a built-in crossover for bi-amping suitable cabinets or cabinet combinations but can also be run full-range. In bi-amp mode up to 300W are available to the bass end with 100W for the top.