Gallien-Krueger Fusion 550 - 500+50-Watt Bi-Amp Hybrid Bass Head

550W Hybrid Bass Amplifier Head with 2 Channels, 4-band Active EQ, Contour and Presence Controls, and Effects Loop
Gallien-Krueger Fusion 550 - 500+50-Watt Bi-Amp Hybrid Bass Head image 1
Gallien-Krueger Fusion 550 - 500+50-Watt Bi-Amp Hybrid Bass Head image 1
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Gallien-Krueger Fusion 550 - 500+50-Watt Bi-Amp Hybrid Bass Head
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Tube Preamp and Solid-state Power Amp!

Get the power you need and the tone you crave with the Gallien-Krueger Fusion 550 bass guitar amplifier head. A 6-stage tube preamp gives you the rich warmth of tubes, and the punchy solid-state power amp delivers the power that GK is known for. Motorized controls change as you toggle between channels via the included footswitch. Professional additions such as an effects loop, DI, tuner out, and speakON connectors make this the perfect amp head for any level of musician. Call Sweetwater and upgrade your rig with the hybrid Gallien-Krueger Fusion 550 bass amp head today!

Gallien-Krueger Fusion 550 Bass Guitar Amplifier Head at a Glance:
  • Big tube tone
  • Sculpt your sound precisely with onboard 4-band active EQ
  • Extremely functional
Big tube tone

Capture the tone you want with the 3-rackspace Gallien-Krueger Fusion 550. The preamp features three 12AX7 tubes for real tube tone. From rock to fusion to slap to reggae, the Fusion 550 has your back. Pumping out 500 watts of low end and 50 watts of high end for your horn, this amp is perfect for any sized venue. An XLR direct out can be used for recording or running to the live mixer.

Sculpt your sound precisely with onboard 4-band active EQ

The Gallien-Krueger Fusion 550 gives you complete control over your sound. Sculpt your tone with the 4-band active EQ, contour, and presence controls, and then add just the right amount of growl with GK's gain control. All the tools you need to dial in your perfect bass sound are onboard the Gallien-Krueger Fusion 550.

Extremely functional

As a gigging musician, you need to be flexible and have gear that is flexible, too. The Gallien-Krueger Fusion 550 is ready for pretty much anything. An effects loop lets you utilize your favorite pedals after the EQ section of the amp. An XLR direct out sends your signal out pre- or post-EQ, and has a ground lift switch.

Gallien-Krueger Fusion 550 Bass Guitar Amplifier Features:
  • Dual-channel hybrid bass guitar amplifier head
  • Sculpt your sound precisely with onboard 4-band active EQ
  • Effects loop for using your favorite pedals
  • XLR direct out lets you go straight into the board
  • Built GK-tough
Shake the house with the Gallien-Krueger Fusion 550 bass amp head!

Additional Media

Bass Guitar Amp Buying Guide

Tech Specs

Type Hybrid
Number of Channels 2
Total Power 550W, 4 ohms
EQ 4-band (Deep Switch, Bright Switch, Contour Switch)
Preamp Tubes 3 x 12AX7
Inputs 1 x Instrument
Outputs 4 x Speaker, 1 x XLR
Footswitch I/O Yes
Effects Loop Yes
Height 5.25"
Width 19"
Depth 9.75"
Weight 25 lbs.
Manufacturer Part Number 302-0420-A

Customer Reviews

Based on 6 reviews
Write your review

Oh so good!!

This is my second time around with the Fusion 550. I got rid of the first one for financial issues and missed it tremendously afterward. So, I finally got around to getting another one . I pair this with a newly acquired CX 410 4ohm cab and also a NEO 212. It sounds so good with 3 12AX7 tubes driving the preamp. It has plenty of volume to cover all of my playing situations. I highly recommend this head.
Music background: Weekend Warrior for 20 years


There wasn't a 10 star option so 5 will have to do. This amp can take whatever you throw at it, unrelentingly so. It's always at least 5 steps ahead of you but without drastically changing your tone. I've seen some subpar reviews out there and honestly I understand why BUT they are not really correct. If I had to choose one word to describe this head I'd choose "unforgiving" due to it's truly user driven potential. Basically what I mean is that if you can't do it, the amp won't do it for you. It reminds me of the old Genz Benz El Diablo guitar amps that got a bad rap due to bad players (lol), basically if you aren't a tone hunter you will not truly understand the capabilities of amps like this. If you're faint of heart go buy a regular solid state. Honestly I think even some tone hunters will be frustrated, so if you aren't a tonal warrior this amp may be too much. Greatest amp I've played, by far, and I've had the opportunity to play some incredible custom and mass produced amps. Really has a seemingly endless amount of tonal options, it's all in your fingers, equipment, and imagination! Buy it, love it, create masterpieces with it

GK Fusion 550

Being an owner of two other GK amps I purchased this one on Dave C. 's word and have not been disappointed one bit. Great amp and great tone and killer Sweetwater service.

Phenominal Tone!

Just got this amp after a lot of research into all the brands out there. Used it this last weekend first time and and was completely floored at the great tone! I ran it through a Hartke 4X10 XL cab and the tone was warm and clean. Lots of power and a lot of options in regards to set up with the two channels available. Motorized knobs are cool when switching between the two channels. They work quickly and move to exactly where you lef them. Best amp out there, a lttle pricey but worth every penny!
Music background: Professional Musician and engineer

A fantastic amp!

Tons of power for that clean, potent low end. A hot tube preamp that ranges from clean and warm to all--out distortion. The classic "just right" GK eq controls. Motorized knobs that quickly and smoothly glide between two different settings. Most importantly, big fat tone. I have played (and own) quite a few great amps, but this has become my go-to. I play loud rock music, and this amp's 550 watts are louder and faster than 1,000 watts in any other head or power amp I have tried.
Music background: Old punk rocker who can't stop
See also: Bass Amp Heads, Gallien-Krueger, Gallien-Krueger Bass Guitar Amp Heads