Gallien-krueger GK FUSION S 500 450W CLASS D
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Gallien-krueger
https://www.gallien-krueger.com
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Historical Context and Positioning in the Range
The Fusion 500S is rooted in Gallien-Krueger's DNA: bass amplification designed to cut through the mix with a fast attack and very clear definition. The manufacturer highlights over 50 years of amplification experience and a direct lineage with the spirit of the GK 800RB : a modern sonic signature, effective live, and a tone section designed to sculpt quickly, well, and straightforwardly. Within the "S" family, the 500S aims for the ideal balance between power, portability, and versatility.
Who This Amp Is For
This head is tailored for intermediate to professional bassists who want a reliable amp, easy to dial in, and capable of handling rehearsals, studio sessions, and gigs. Its lightweight format is perfect for mobile musicians (transport, fly dates, shared backline), while the balanced DI and effects loop make it an excellent foundation for a pedal rig. Style-wise, it excels whenever precision and impact are needed: rock, pop, metal, funk, punk, gospel, and anything requiring a well-controlled low end and present mids.
Features and Innovations
The core of the Fusion 500S relies on a very effective 4-band active EQ to fit your bass into a dense mix, complemented by voicing filters " Bump," " Contour," and " Presence " to change character instantly (more body, scooped, brighter). The dedicated overdrive, footswitch-switchable, adds an immediately usable gritty channel, and its Tone control helps maintain articulation within saturation. For stage and studio integration, there is a balanced XLR DI output with pre or post EQ selection, an effects loop (Send and Return on unbalanced jacks), as well as an Aux input and a headphone output for silent practice. The Twist Lock speaker outputs and load selection allow optimizing power according to your speaker cabinet setup.
The Sound
The Fusion 500S offers a very recognizable GK foundation: firm lows, fast attack, and clear mids that provide presence without unnecessarily boosting the low end. In clean tone, it delivers a tight and dynamic sound, ideal for fingerstyle and pick playing, with excellent note definition. In crunch, the amp responds quickly and keeps the lows clean, helping maintain clarity even when the band gets aggressive. The dedicated overdrive adds a more organic and musical grit, designed to move from a subtle "hair" to a more pronounced saturation while retaining control via EQ and voicings. Note: this specific model is still little documented in terms of officially associated artists but clearly fits within the GK tradition of percussive and "mix-ready" sounds.
Technical specifications
| Effects | Overdrive | EQ | 4 channels |
| Category | Bass amp head | Headphone output | Yes |
| Technology | Hybrid | Color | Black |
| Effects loop | Yes | Finishing | Steel |
| Category | Amplifier | Power output | 500 W |
| Voicing filters | Bump, Contour, Presence | Load capacity | 2, 2.7, 4, and 8 ohms |
Questions frequently asked
Gallien-Krueger Fusion 500 Bass Amp Head: what power and speaker impedances?
The rated power is 500 W. The Twist Lock speaker outputs accept loads of 2, 2.7, 4, and 8 ohms.
Is the DI output of the Fusion 500S suitable for stage and studio use?
The balanced XLR DI output provides a connection to a mixer or interface. The pre/post EQ switch determines whether the amp's EQ is sent through the DI signal. An effects loop with unbalanced Send and Return jacks is also included.
Is the overdrive footswitchable?
The dedicated overdrive is footswitchable and features a Tone control to maintain the articulation of the distorted sound.
Can one use headphones with this bass head?
For silent playing, a headphone output and an Aux input are provided. The head also has a 4-band active EQ for tone shaping.
What voicing controls are available?
The Bump, Contour, and Presence filters quickly shape the tonal character. They complement the 4-band EQ on this hybrid head with a black steel finish.
