Gallien-Krueger MB Fusion 800 800-Watt Ultra Light Hybrid Micro Bass Head

800-watt Bass Amplifier Head with All-tube Preamp, 4-band Active EQ, 14dB Pad, Dual Gain Settings, and Boost Switch
5/5 12 Write review Item ID: MBFusion800
Gallien-Krueger MB Fusion 800 800-Watt Ultra Light Hybrid Micro Bass Head image 1
Gallien-Krueger MB Fusion 800 800-Watt Ultra Light Hybrid Micro Bass Head image 1
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Gallien-Krueger MB Fusion 800 800-Watt Ultra Light Hybrid Micro Bass Head
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The Powerful and Portable MB Fusion 800!

The Gallien-Krueger MB Fusion 800 bass amp combines the all-tube preamp of the MB Fusion and the massive power and control of the MB800. The folks at Gallien-Krueger have designed a bass amp that weighs very little and delivers a massive 800 watts. The MB Fusion 800 can handle the largest venues, and you won't even break a sweat carrying it. Also, the MB Fusion 800's controls are illuminated to indicate its operating status. Get an all-tube sound with the MB Fusion 800 today!

MB Fusion 800 at a Glance:
  • Extreme functionality
  • Highly portable
  • All-tube preamp
Extreme functionality

The Gallien-Krueger MB Fusion 800 has an all-tube preamp grafted onto the power amp section of the MB800. The MB Fusion 800 also gives you powerful tone-shaping options, including an active 4-band EQ that's equipped with a contour switch, as well as a footswitchable boost control that lets you kick in extra punch when you need it. Sculpt your tone with the 4-band active EQ and contour controls, and then add just the right amount of growl with GK's gain control.

Highly Portable

At five and a half pounds, the MB Fusion 800 packs in more than 100 watts per pound. And, with that much firepower at your disposal, you'll be ready to push some air in any venue. Plus, it's small and lightweight enough to fit in your gig bag.

All-tube preamp

This all-tube preamp runs on three 12AX7 tubes at high voltage. The MB Fusion 800 has two footswitchable gain and master volume controls. This means that two flavors of all-tube sound are only a tap away. With the wide range of tones and textures available, the MB Fusion 800 is sure to exceed the expectations of any bass player.

MB Fusion 800 Features:
  • Passive and active switch
  • Preamp gain control
  • Contour control
  • Active 4-band EQ
  • Balanced XLR DI output jack
  • State-of-the-art Class D power amp
  • speakON speaker output jacks
Get blown away by the power and portability of the Gallien-Krueger MB Fusion 800!

Additional Media

Bass Guitar Amp Buying Guide

Tech Specs

Type Hybrid
Number of Channels 2
Total Power 800W
EQ 4-band
Preamp Tubes 3 x 12AX7
Inputs 1 x Instrument
Outputs 2 x speakON, 1 x XLR
Footswitch I/O Yes
Effects Loop Yes
Height 1.75"
Width 12.25"
Depth 10.75"
Weight 5.5 lbs.
Manufacturer Part Number 302-0710-A

Customer Reviews

Based on 12 reviews
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Small, lightweight and powerful

The title says it all. Love this head. Playing through an older Bag End 410 cab the sound is amazing at low and high volume levels. The EQ is very responsive so the tonal possibilities are endless. Engaging the deep button at my EQ settings, which are mostly flat, added some nice punch to my sound instead of low-end rumble which is what you usually get with that feature. I get some hiss from my cab if I engage the presence, but it's not noticed during playing. Kenny Stratton at Sweetwater brought this head to my attention and I couldn't be happier with it. If your looking for a small, lightweight bass head with huge sound this is the head you're looking for.
Music background: Semi-pro stage and studio

This amp is a HAMMER!

I've been playing over 30+ years, I gig regularly and know bass gear. Pick an amp manufacturer and I've used their product and liked most and loved some. When my M6 Carbine gave up the ghost last week I decided to give the Fusion 800 a try after much research and the need to help out my aging back. I've used GK amps before and liked them, but a little too modern sounding for my style. However...the Fusion 800 is a different animal. It is clear that it is still in the GK family, you can get that classic GK growl that you've always heard about, but, you can get everything else you can imagine out of it as well. Best I can describe it is - smooth, articulate and clean up to warm fuzzy overdrive and everything in between. What impresses me most about this amp it the fact that it is a HAMMER. It is clear that from the moment you power up right through the moment that you find your tone and sweet spots on the gain channels, that this amp sounds and feels like it can punch through concrete! All other great things about this amp aside, its ability to punch is above and beyond any other I've played through. Finally, after 30+ years, I know what PUNCH means! To fully disclose, I play it through 2 Markbass NY151 15" cabs, I am sure that adds to it, but it seems that no matter how I change the tone on the amp, it never fails to blow me away with its ability to PUNCH, and no other amp I've used with these cabs has been able to duplicate what I am experiencing with the MBF800. 6 stars on the amp and as always, my rep Frank G gets 6 stars also.
Music background: gigging musician

Exceptional Tone Control

The A and B channel gains with B-ratio and a Master Volume offers precisely the control I wanted for managing levels across loops (on Ditto X2) without losing the ability to drive one channel's tubes harder but not necessarily louder. If that makes any sense to the reader, then you know how hard it is to get a clean sound on one channel that isn't completely buried under loops recorded with more drive on the other channel. This amp gives you that control and sounds fantastic. As is frequently reported, the quality of GK's direct out is excellent. Also as reported by another reviewer, the knobs turn very easily so each setup can take a little more time. Easy fix: painters masking tape (comes off easily) along the top-front edge with all your "o'clock" settings noted; e.g. 4, 6, 5, 6, 7, 5, 7...

Tonal Bliss!!!

I've owned a lot of bass amps over a 50 year career, and NEVER have I been as satisfied with an amp purchase. The tonal variations that are attainable with this amp are endless. The fact that the ratio between channel 1 and 2 is held when changing the master makes it nice and user friendly onstage. I've owned many bass amps that have a bass boost, but usually stayed away from using it due to the mud that also accompanied that boost. Not so with the G-K MB Fusion 800! This is the most useable bass boost I've ever heard! The Presence boost is just as incredible! I've used my head with three different speaker cab combos. 1) Two G-K Neo 115 III cabs 2) Two Aguilar GS-112 cabs 3) One Eden D210XST 4 ohm cab every instance, this amp soars above the rest! After using SWR, Ampeg, Fender and an array of others, I cannot say enough good things about the G-K. Well built, light weight, user friendly front panel, and foot switchable channel selection are just a few of the features on this well thought out design. If this amp ever got stolen, I would most definitely buy another immediately. Absolutely no regrets on this purchase. Worth every penny!
Music background: 50+ years of playing bass professionally.

GK MB Fusion 800

After my last MB 800 was stolen after a gig I decided to try the new MB Fusion 800. This is a beast with the growl and bottom end I am always trying dial in. The power is simply put, “insane”. After each set on my first gig with this fusion, I was approached by friends telling me they have never heard me so clearly and that they can feel my bass. I even pulled out of the mains and still had to keep the volume level down or I would overpower everyone else. Yes, I am very happy with this lightweight but powerful amp pushing my 8 x 10 cab.
Music background: weekend musician
See also: Bass Amp Heads, Gallien-Krueger, Gallien-Krueger Bass Guitar Amp Heads