Gallien-Krueger MB Fusion 500-Watt Ultra Light Hybrid Micro Bass Head

500-watt Bass Amplifier Head with All-tube Preamp, 4-band Active EQ, 14dB Pad, Dual Gain Settings, and Boost Switch
Gallien-Krueger MB Fusion 500-Watt Ultra Light Hybrid Micro Bass Head image 1
Gallien-Krueger MB Fusion 500-Watt Ultra Light Hybrid Micro Bass Head image 1
Sweetwater Savings: $309.50 MSRP: $1,048.50
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Gallien-Krueger MB Fusion 500-Watt Ultra Light Hybrid Micro Bass Head
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Big Tube Tone in a Tiny Package!

Get the power you need and the tone you crave with the Gallien-Krueger MB Fusion bass guitar amplifier head. A six 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. It delivers 500 watts of power in a less-than-1U amp that weighs under 4 lbs. - easily small enough to fit in your gig bag. Professional additions such as 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 MB Fusion bass amp head today!

Gallien-Krueger Fusion 500 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 MB Fusion. The pre-amp features three 12AX7 tubes for real tube tone. From rock to fusion to slap to reggae, the MB Fusion has your back. Pumping out 500 watts of low end, 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 MB Fusion gives you complete control over your sound. Sculpt your tone with the 4-band active EQ and contour controls, 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 MB Fusion.

Extremely functional

As a gigging musician, you need to be flexible and have gear that is flexible, too. The Gallien-Krueger MB Fusion 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 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 - go straight into the board
  • Built GK-tough
For a flexible bass head that's small enough and light enough to go anywhere, check out the Gallien-Krueger MB Fusion!

Additional Media

Bass Guitar Amp Buying Guide

Tech Specs

Type Hybrid
Number of Channels 2
Total Power 500W, 4 ohms/350W, 8 ohms
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 10.75"
Depth 8.5"
Weight 4.5 lbs.
Manufacturer Part Number 302-0540-A

Customer Reviews

Based on 4 reviews
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Fat and warm

Love it.. I play on a worship team a few nights a week and right away I noticed the difference in tone through my in ears.. warm and clear. Not punchy and shrill like the last head with di out. Best tone I've ever had, and I can get great tones at low volume for my acoustic trio\duo gigs. And I can rattle the walls during full band gigs. The dual channel is killer amd with the foot switch I can get an awesome gritty boost.. Love this head.. I haven't even tapped into all it can do but I know this is the one! It's a keeper!

gkmb500 fusion bass head

Received this as a gift from my wife as she understands the importance of portability regarding bass gear and Quality sound. Honestly I have played and owned Ampeg, Carvin and Line 6 bass gear but needed something portable and with great tone. After researching this for a couple months and reading numerous reviews on the portable amps out there decided on the GK. This amp arrived at my place in Maui in 3 days. Packaging was primo, opened it up, set all knobs flat for starters, fired it up with my euphonic speakers and hagstrom bass and I am blown away by the clarity, tone and power that this beast produces. The fact that it is made in USA is even better. Thanks Ryan for the great service on this order.
Music background: Playin bass for 40 years

Light in weight but not in tone!

Honestly, I wasn't expecting much when I bought this to appease my lower back. But really? REALLY?? I've had this amp for close to a year now, played about 30 shows with it and it simply KILLS! Period. Super tone, plenty of options you can actually USE and did I mention that my CAT can carry it?I'm sold. End of story.
Music background: 44 years pro, semi-pro. Old guy. :-)

Great amp!

This amp sounds great for live and recording with is XLR direct out.Great in your face low end, lots of warmth and just clear as can be. Overall a great amp for a great price.
Music background: Pro musician
See also: Bass Amp Heads, Gallien-Krueger, Gallien-Krueger Bass Guitar Amp Heads