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Gallien-Krueger MB150S-112III 150W MicroBass Combo Amp  

Product #482567

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Item Note:

This product has been discontinued but may be available as a Open Box item.

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There's nothing micro about this amp's sound or abilities!

This MB150S-II2 amp is the realization of every bass players secret dream - a light, small, super-portable amp with sweet tone and ample power. Housed in specially designed aluminum cabinets, it is a little over a foot high and wide, weighs only 25 pounds, and drives a 12 speaker. With standard features like a 4-band EQ, standard patching, and a limiter, it makes it the ultimate practice and backstage amp, with many players finding theirs fully gig-worthy.

  • Constructed of 0.1" aluminum chassis with an 18 gauge steel grill
  • 1-year warranty on speakers
  • 2-year warranty on electronics

MB150S-112III 150W MicroBass Combo Amp Specifications:

  • Cooling: Convection
  • Dimensions: 13.7"W x 15"H x 8.5"D
  • Direct Out: XLR and ground lift
  • Equalizer: Bass Specific Series Four Bank Active
  • Input Section: 1/4" Jack, 10dB Pad and Volume
  • Output: Master and Limiter (Adjustable Level and LED)
  • Patching: Send, Return, Line Out and Head Phone
  • Power <1% THD: 150W at 4 ohms,100W at 8 ohms, 1 kHz
    Power Connectors: Two 1/4" jacks and Speaker On/Off Switch
  • Voicing Filters: Low Boost, Adjustable Contour and High Boost
  • Weight: 24 lbs.
  • Woofer: 1 x GK-Paragon 12LB150-8 Stamped Frame, 12"
review resources


by PowerReviews
Gallien-KruegerMB150S-112III 150W MicroBass Combo Amp

(based on 4 reviews)

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Reviewed by 4 customers

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(1 of 1 customers found this review helpful)


A Great Little Power Horse


from Sydney Australia

About Me Professional Musician

Verified Buyer


  • Easy To Use
  • Excellent Sound
  • Good Warmth
  • Portable
  • Powerful


    Best Uses

    • Performances

    Comments about Gallien-Krueger MB150S-112III 150W MicroBass Combo Amp:

    Hi Guys,

    I recieved the amp last Wed.13 Nov. Arrived in one piece and is in good A1 Condition. Once I had the Power lead Changed to Aust. format and the power upgraded to was up and running.
    I bought it specifically for standup double bass. Plenty of tone variation and volume headroom. My Fender Jazz sounds great too.
    Thanks for your prompt delivery, I'm very happy with my purchase.

    Kind regards,

    Phil Small

    (4 of 6 customers found this review helpful)


    Great design, but better suited for rehearsals


    from Chicago, IL

    Comments about Gallien-Krueger MB150S-112III 150W MicroBass Combo Amp:

    I owned this for 2 yrs. The only problem I've had was that the blue LED went out. It was under warranty & GK paid for the repair. This unit is very sturdy (metal case instead of wood). There are lots of great features, incl. XLR Direct Out, Contour, Limiter, Hi and Lo Mid controls (+ Bass & Treble); Send/Rtn Loop & jacks for extension speakers. Its the most portable; i.e. LIGHTEST 100-watt combo I found. I bought the GK bag which allowed me to carry it on my shoulder, leaving both hands free. It's definitely powerful enough for rehearsals, even with a loud drummer. However, in those cases I did need to run @ almost full power. Since the cabinet isn't very deep, it doesn't project as well as a larger, deeper cab would, even if they're rated for the same watts. That's the trade-off when you want to carry 100 watts on your shoulder (note: it only outputs 150w with the extension cab). Later I bought the extension cabinet. I think this would work okay for smaller gigs, but I still don't believe most bassists would think there was enough bottom if the room had a higher ceiling. Also re: tone - there wasn't enough high end/snap for me when slapping, even with the Hi Boost engaged, but if you only play finger-style there should be more than enough tonal options. After Peavey introduced the Tour series heads I decided to pair the Tour 450 with (1) Bag End S10-DX cab. The S10 is about the same size and weight as the GK, but sounds MUCH better to me. And, the head + cab cost about the same as the GK by itself. I put the head in a roller rack and I can still move everything to the car in one trip without strain. The Tour 450 delivers 300w into 8 ohms, meaning I can now use the same setup when rehearsing and for small to mid-size gigs. I left the GK at church for practices and I don't miss it too much.

    (70 of 97 customers found this review helpful)


    Awesome Sound, Worth It!


    from Florida

    Comments about Gallien-Krueger MB150S-112III 150W MicroBass Combo Amp:

    I just purchased the extension cab for this unit. I am very pleased with the sounds that I am able to get from the combo. Crystal clear sound, booming lows, very compact and very sturdy. Couldn't be happier!

    (76 of 116 customers found this review helpful)




    from sf,ca

    Comments about Gallien-Krueger MB150S-112III 150W MicroBass Combo Amp:

    Excellent amp Great tonePlenty of volumeSuper light!Electric and Acoustic basses sound great through itHighly recommend

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