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Product 481858

Gallien-Krueger MB2-500 Ultra Light Bass Amplifier Head   

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The excellent MB2 Ultra Light Bass amplifier head is fully equipped with professional features: master and gain, padded input, contour, 4-band active...Click To Read More About This Product

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Big power, awesome tone, and less than 4 pounds!

The excellent MB2 Ultra Light Bass amplifier head is fully equipped with professional features: master and gain, padded input, contour, 4-band active EQ, footswitchable boost, tuning mute, effects loop, isolated DI, Speakon combo outputs, headphone/line out, and 500W of power into 4-ohm loads.

  • 500W at 4 ohms, 350W at 8 ohms
  • 10dB pad
  • Tuning Mute
  • Input Gain, Master
  • Contour
  • 4-band active EQ
  • Footswitchable boost with independent volume
  • Effects Loop & Tuner out
  • Transformer Isolated DI out with Pre/Post Switch and Ground Lift
  • Dual Speakon Combo Outputs
  • Headphone/Line Out
  • Footswitch Input

MB2-500 Ultra Light Bass Amplifier Head

  • Dimensions: 11"W x 1-3/4"H x 7-3/4"D
  • Weight: 3 lbs.12 oz.

Review Snapshot

by PowerReviews

(based on 7 reviews)

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Reviewed by 7 customers

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(1 of 1 customers found this review helpful)


Decent for Jazz or other quiet gigs

By Zippo the Heavier

from markle

See all my reviews

The "D" in class D amp designation does not stand for "digital." It's a switching mode topology amp. (You can look that up on Wikipedia if you want to know more)What's bad about class D amps is that they are tricky to design for high performance in pro audio. What's cool about them, literally, is that they are much more efficient, and therefore run cooler. That means they can drive low ohm loads without melting. When it comes to delivering high power in a lightweight package, Class D is fine for bass amps, especially if you don't drive a high-impedance. This particular amp actually sounds good and has adequate power for most users. If you are playing in a very loud band, this won't cut it, but for Jazz and most reasonable-volumes, this is a great low-cost solution.Although I am not a fan of GK products, this is one of their best and so far, it seems to be working well. I am running it through Two, 10" speakers, (Eminence CA2010)wired together for 4 ohms, in home-made cabs that weight only 22lbs loaded. This suits my style, our volume and our travel needs nicely. The amp head w / speaker cab serves its function as a stage monitor well without bass-loading the rooms we play in. The line out provides signal to the mains which fill the FOH sound. If this is similar to your set-up, you will probably get good results too.



By Anonymous

from Undisclosed

I have a GK combo amp & cab that I love (except for the weight), so I was intrigued when I got to play through this at a show. The bands that night shared their backline. Everything went smoothly for me, but this amp shut itself off mid-song for 2 other bassists. The power light would turn orange and then nothing. It would come back on only to shut itself off again a few bars later. In fairness, these bassists are pretty loud and heavy, and the amp was working hard all night long. Shutting off unexpectedly is unacceptable though.


David beats Goliath

By Sylvester(Snap) Andrews

from New Orleans,La.

See all my reviews

I played on a show with another band and the other bass player had a big 1000 watt amp with 8-10 cab. I saw them looking at my little GK Micro Rig with 2-12 cabs. When I played my 12 string bass through it they were blown away!! I didnt have to go past 3 on the volume. WOW


Big Little Monster

By Himig Pinoy

from Nassau, Bahamas

I have this little monster for about two months now and I can say that this is powerful enough for medium sized gigs. You can get tones from thundering lows, powerful mids and ringing highs. Light enough to carry around and it could fit in the outside pocket of your gig bag. Plug a 4 ohms 2 x 15" bass cab and you are ready to rumble.



By BbBassman

from Brooklyn

I could not believe how much sound comes out of this little amp! I've been playing for years and have owned lots of amps. Love that big GK tone!A++++


Little Box O' Thunder

By Jaco Von Funkenheimer

from Triangle, North Carolina

?What ?cha got there, some little pre-amp?? said a fellow bassist looking at the MB2-500 perched on my Trace Elliot 4X10. ?No, my friend, that is the 500 watt Thunder Box!"GK's MB2-500 is light, compact, simply laid out, and yet has the tone shaping circuitry to get a wide variety of sounds. Take the Contour and Boost knobs for a spin, and use the well thought out EQ to find the tone you like. Leave the DI box at home, as the unit has an XLR out that can be set for pre or post, and a ground lift switch. I love the tuner output, and although I?ll probably never use the effect send/return, it?s nice to know they?re there. The combination Speakon/1/4 inch outputs are innovative and save real estate on the back panel. Oh, and this thing CRANKS. The first gig I played with it was an outdoor show, and it had plenty of power with headroom to spare. And did I mention it?s light? Less than 4 pounds ? unbelievable.


great lil amp which couldn't

By pork chops

from east coast

See all my reviews

great idea, great tone, unfortunately very questionable execution, probably the worse GK product of all times.1st amp was noisy out of the box with very poor signal to noise ratio and was only usable with treble turned down to <30%, 2nd one was better but boost is not usable, and after ~1hr at ~150wt volume starts breaking up and shutting down due to elevated level noise. Funny thing that all problems centered around pre-amp/tone section, running directly into power amp via external pre-amp produces zero noise.Don't buy it get RB700 if you are after GK tone.

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