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Gallien Krueger Fusion 550 Bass Guitar Head

Quick Overview

The Gallien Krueger Fusion 550 Bass guitar head provides the rich warmth of tubes combined with the quick and punchy power section that Gallien Krueger bass amps are renowned for.
Gallien Krueger Fusion 550 Bass Guitar Head
The Fusion 550 incorporates a unique six stage tube preamp paired with a high current solid state power amp. The rich warmth of tubes, combined with the quick, punchy power section that GK bass amps are known for is an experience like no other. In addition, GK takes the next step in innovation by adding motorized controls which allow you to store two different settings that can be recalled via the provided footswitch.

Gallien Krueger takes the next step in innovation by incorporating motorized knobs which allow you to store two different settings. This gives you the ability to dial in a separate overdriven or slap tone and footswitch between them. The Fusion 550 also features a simplified version of GK's exclusive 50 watt Horn Bi-Amp System. Dial in the horn where you like it and as you adjust your volume with the master control the ratio between the woofer and tweeter is preserved.

Other features of the Gallien Krueger Fusion 550 include tube driven four band active EQ and voicing filters with a frequency select for the contour control. The rear panel features include Neutrik Speakon and ¼" speaker output jacks, effects loop, tuner out, and a footswitch input jack. Also on the rear panel is a DI output which uses an isolated transformer for ultra-quiet operation.


  • 500 watts (4 ohms) 350 watts (8 ohms)
  • 50 watt horn bi-amp system
  • Tube pre-amp (three 12AX7's)
  • Motorized knobs (footswitchable)
  • Four-band active EQ
  • Tuning mute (footswitchable)
  • Effects loop & tuner out
  • XLR out, pre/post EQ & ground lift switch
  • Speakon and 1/4” outputs
  • 19x5.25x9.75 (3 rack spaces)
  • 25 lbs.
  • Manufacturer Gallien-Krueger