Gallien-Krueger MB150S/112

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$699.99 Price Tier: Standard

5.0 (2)

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

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Page last updated Jun 14, 2026

Pricing and availability

We compare 600+ stores and found this item at 1 store. Prices updated June 14, 2026.

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5.0 (6)

$699.99 2 available Used

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Average Price: $700

Standard/Professional

$200

$701+

Price Tier

In the Bass Combo Amplifiers category, Gallien-Krueger MB150S/112 is priced in the upper end of the Standard/Professional range. This is quality gear at a fair price point, suitable for beginners, hobbyists, and pros alike.

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Description

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The Gallien-Krueger MB150S/112 is a compact powerhouse designed for bassists who demand both portability and performance. Part of the renowned MicroBass series, this amp delivers a robust 150 watts of sound through a single 12" speaker, ensuring your bass lines cut through the mix with clarity and depth. Whether you're jamming in a small venue or practicing at home, the MB150S/112 is built to adapt to your needs with its versatile tone controls and durable construction.

This combo amp stands out with its active 4-band EQ, allowing you to effortlessly craft your signature sound. The inclusion of an adjustable contour, high boost, and low cut buttons offer further tonal customization, making it easy to switch styles on the fly. Designed with the gigging musician in mind, the amp features a rugged aluminum chassis, ensuring it can withstand the rigors of the road while weighing in at just 26 lbs.

Functionality is at the forefront of the MB150S/112 design. The amp is equipped with an effects loop for integrating your favorite pedals, an XLR direct out with ground lift switch for seamless connectivity, and a headphone output for silent practice. Additionally, a line-out option provides flexibility for live performances or recording sessions. Compact yet powerful, the Gallien-Krueger MB150S/112 is a reliable companion for bassists who crave quality and convenience.

Key Features:

150 watts of power through a 12" speaker
Active 4-band EQ for precise tone shaping
Durable aluminum chassis for road-ready reliability
XLR direct output and 1/4-inch line-out
Effects loop and headphone output for versatile use

Product specs

Brand	Gallien-Krueger
Model	MB150S-112 150W 1x12" Bass Combo
Finish	Black
Year	2010s
Categories	Bass Combo Amps
Color Family	Black
Electronics	Solid State
Number of Channels	1 Channel
Number of Inputs	2 Inputs
Output Power (Watts)	150
Power Tube Type	None
Reverb	None
Speaker Configuration	1x12"

FAQs

What are the core tonal characteristics of the Gallien-Krueger MB150S/112?: The Gallien-Krueger MB150S/112 offers a clean and articulate tone, favored for its clarity and punch, making it suitable for jazz and studio work. Its solid-state design ensures consistent sound quality across various volume levels.
Is the Gallien-Krueger MB150S/112 loud enough for live performances?: With 150 watts of power, the MB150S/112 is suitable for small to medium-sized venues, especially when paired with a PA system. For larger gigs, additional amplification might be necessary.
Does the Gallien-Krueger MB150S/112 take pedals well?: Yes, the Gallien-Krueger MB150S/112 handles pedals effectively, making it versatile for different tonal needs. Its clean sound foundation allows effects to be clearly articulated.
How portable is the Gallien-Krueger MB150S/112 bass combo amp?: The Gallien-Krueger MB150S/112 is highly portable, weighing approximately 26 pounds, making it convenient for musicians on the move. Its compact design is ideal for travel and easy setup.
What type of speaker configuration does the Gallien-Krueger MB150S/112 have?: The Gallien-Krueger MB150S/112 features a 1x12" speaker configuration, providing a balanced low-end response suitable for various playing styles.

Videos

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Gallien-Krueger MB150S Demo by Norm Stockton

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GALLIEN-KRUEGER MB150S（Ⅲ）VS　PJB（PHIL JONES BASS）SUITCASE COMPACT BG-400 比較レビュー。Comparison Review

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Reviews

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PROS

Ideal for small to medium gigs, keeping up with full bands
Great tone with very good volume levels
Built-in low cut and compression features enhance sound quality
Aluminium construction avoids resonant frequency peaks
Lightweight, easy to transport compared to traditional amps
Compatible with extension cabs for increased output
Onboard limiter useful for peak control

CONS

Requires additional pedal for optimal volume without breakup
Might lead to envy from bandmates due to its lightweight design

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Gallien-Krueger MB150S/112.

Comparisons

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The GK MB150S is noted for its built-in DI, preferred for direct PA connection over miking, making it more versatile for live jazz performance settings.
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Users compare Gallien-Krueger's dry, tight, growly sound to Ampeg's pillowy, raspy tube sound, mentioning GK's suitability for metal and hard rock due to its ability to cut through mixes.
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Features and functionality

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The GK MB150S's 150 watts may struggle against drums or brass in jazz ensembles, but excels for solo practice due to its compact, combo design.
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The MB115-II is praised for its weight-to-power ratio, being 20 pounds lighter than comparable amps while still delivering significant output for smaller venues.
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Use cases and applications

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The MB150S is ideal for jazz, funk, and hip-hop styles, particularly when collaborating with quieter setups or using a PA system for amplification.
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The MB150S-III/112 combo is frequently used for live performances, noted for its excellent sound and durability in regular gig settings.
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Build quality

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The MB150S-III/112 combo is described as "indestructible" by a regular gigging musician, noting its resilience and excellent sound quality.
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User experience

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Owners report that Gallien-Krueger amps, such as the MB series, can have reliability issues, with some experiencing failures like circuit component fires and power issues soon after purchase.
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Value and pricing

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A used Gallien-Krueger 800RB can be found inexpensively and is recommended for those seeking a durable, classic solid-state bass amp.
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Les Claypool

Singer, Bassist

Primus

Verified via Photo

Used on basically all of 1997's "Brown Album". according to this old web interview/article, Les confirms that the main amp he used on the Brown Album was this small solid-state bass amp. he states, " for me, it's easier to get tones out of smaller, quieter amps, because you're not feeling the big sound in the room, but just hearing what the mic hears. The mic can't feel the rumble that you feel through the ground. Anyway, our success rate has been higher when we've kept the volume's down."