Pricing and availability

We compare 600+ stores and found this item at 4 stores. Prices updated .

Sweetwater
4.0 (7)
$299.00
Guitar Center
4.5 (8)
$399.00
Amazon
3.1 (25)
$389.00
Reverb
5.0 (5)
$502.60 New
$290.50 Used

Average Price: $376

Standard/Professional

$100

$401+

Price Tier

Budget

Standard

High-end

Price History

Based on price data from 2 merchants for "Kala U-Bass Rumbler Mahogany". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

* Product prices and availability are updated by Equipboard every 24hrs and are subject to change. Equipboard may receive compensation for purchases made at participating retailers linked on this site. This compensation does not affect what products or prices are displayed, or the order of prices listed. For more information, please refer to our affiliate disclosure.

Description

Unveiling a compact powerhouse, the Kala U-Bass Rumbler Mahogany redefines what you thought possible from a bass ukulele. This acoustic-electric marvel offers surprisingly deep, full bass tones that belie its petite size. Crafted with a laminate mahogany body, it delivers warm, woody undertones and a balanced midrange, reminiscent of an upright bass with a unique U-Bass twist. The custom Kala electronics with an active EQ and onboard tuner ensure that each note resonates with clarity and precision, whether you're in the studio or on stage.

What sets the Rumbler apart are the proprietary Aquila Silver Rumbler Strings, designed to produce a rich, resonant sound that fills any room. The 21"-scale, 16-fret fingerboard offers comfortable playability, while die-cast tuners and separate compensated saddles guarantee your tuning remains rock-solid. Portable enough to meet most carry-on standards, this U-Bass is ready to accompany you on any musical journey.

Whether you’re jamming at home or performing live, plug in this little beast using its piezo pickup, and prepare to be amazed by its massive sound. Plus, with a deluxe custom padded gig bag included, your Kala U-Bass Rumbler Mahogany is always ready to hit the road with you.

Key Features:

  • Acoustic-electric bass ukulele with compact 21"-scale and 16-fret fingerboard
  • Laminate mahogany body for warm, balanced tones
  • Custom Kala electronics with active EQ and onboard tuner
  • Proprietary Aquila Silver Rumbler Strings for rich, deep sound
  • Onboard piezo pickup for exceptional live sound
  • Die-cast tuners and separate compensated saddles for stable tuning
  • Includes deluxe custom U-Bass padded gig bag

Product specs

Brand Kala
Model RMBL-FS U-Bass Rumbler Fretted Acoustic Electric Ukulele Bass
Finish Satin Brown
Year 2010s
Categories 4-String Basses, Acoustic Bass Guitars
Active / Passive Pickups Active Pickups
Active Preamp Active Preamp
Body Shape Mini
Color Family Brown
Fretboard Material Walnut
Number of Frets 16
Number of Strings 4-String
Right / Left Handed Right Handed

FAQs

What type of wood is used in the construction of the Kala U-Bass Rumbler?

The Kala U-Bass Rumbler features a laminate mahogany back and sides, with a mahogany neck and a rosewood fingerboard and bridge, offering a warm and resonant tone.

How does the Kala U-Bass Rumbler's size affect its playability and portability?

With a 21-inch scale and mini body shape, the Kala U-Bass Rumbler is compact and easy to transport, making it ideal for travel and convenient for players with smaller hands.

Does the Kala U-Bass Rumbler come with built-in electronics?

Yes, the Kala U-Bass Rumbler is equipped with an active electronic system, including an active EQ and built-in tuner, allowing for easy amplification and precise tuning.

Are the Kala Silver Rumbler Strings suitable for this bass?

The Kala U-Bass Rumbler comes with Kala Silver Rumbler Strings, which are specifically designed to complement this instrument, providing a balanced tone and comfortable playability.

Is the Kala U-Bass Rumbler suitable for air travel?

Yes, the Kala U-Bass Rumbler meets most airline carry-on requirements and includes a Deluxe U-Bass Embroidered Gig Bag, making it a convenient choice for traveling musicians.

kalabrandmusic

kalabrandmusic

Kala Rumbler U•BASS

Video thumbnail for Kala Rumbler U•BASS by kalabrandmusic

Kala Rumbler U•BASS

kalabrandmusic

kalabrandmusic

Video thumbnail for Kala U-Bass Rumbler (Ukulele Bass) Demo by C. A. House Music

Kala U-Bass Rumbler (Ukulele Bass) Demo

C. A. House Music

C. A. House Music

Video thumbnail for Kala Ubass Rumbler - Mahogany - Sound Sample (Turn Up Volume) by Ukulele PuaPua

Kala Ubass Rumbler - Mahogany - Sound Sample (Turn Up Volume)

Ukulele PuaPua

Ukulele PuaPua

Reviews

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Kala U-Bass Rumbler Mahogany.

Build quality

  • Some owners report issues like poorly fitting string replacement compartments and finish cracking at the neck joint.

    Source
  • The unique rubbery strings require an adjustment period, which may affect user preference after prolonged use.

    Source

Features and functionality

  • The Rumbler model's pickup section is similar to more expensive models, lacking only a built-in tuner.

    Source

Use cases and applications

  • Ideal for folk music, but less effective for styles requiring defined bending, slapping, and popping.

    Source
  • Owners find the Kala U-Bass suitable for tight stage spaces and gigs where portability is crucial, offering a unique blend of stand-up and electric bass tones.

    Source
  • Owners appreciate the U-Bass for casual use, like couch playing and travel, due to its compact size and acoustic sound.

    Source

User experience

  • The short scale is noted to be easier for mandolin players, but may not suit those accustomed to full-scale bass guitars.

    Source
  • Fretless models are preferred by some due to reduced fret buzz compared to fretted versions, enhancing the overall playing experience.

    Source
  • Heavy action is noted as a downside for some users, potentially affecting playability, especially for novices or those used to lower action instruments.

    Source
  • Roundwound strings can cause squeaky slide noise; some prefer Kala's flatwounds despite requiring nut filing for proper fit.

    Source

Setup and maintenance

  • The rubber strings require frequent retuning upwards due to continuous stretching, and some owners have trimmed and reinstalled them for better stability.

    Source
  • Pre-tensioning strings with minimal wraps helps stabilize tuning by reducing stretch length.

    Source

Mods and upgrades

  • Switching to roundwound strings demands a different nut, but allows the U-Bass to mimic traditional electric bass playability, though it alters the deep double bass sound.

    Source
  • Aquila Thunder Reds are suggested for improved tone; they're waxier than stock strings, offering a unique feel and lasting up to two years.

    Source
  • LaBella Silverback strings enhance intonation and feel, requiring only a truss rod adjustment for optimal performance.

    Source

5.0 out of 5

Based on 1 Review and 2 Ratings

5 star
4 star
3 star
2 star
1 star
trukadi

it hella fun to use

idk i bought this recently and it makes an amazing sound and is hella fun to play B)

Artist usage

Add artist
See how Jacob Collier uses Kala U-Bass Rumbler Mahogany

Jacob Collier

Singer, Guitarist

...
Verified via YouTube

Jacob and his bassist are seen in this video playing the Kala Wanderer U-Bass. (Model can be identified based on wood type and binding)

You can also see him playing it in the video "Jacob Collier - Boogie On Reggae Woman (on the U-Bass)" [*]. The bass is very visible throughout the entire video.

[*] https://www.youtube.com/watch?v=fDy20irhd6o&ab_channel=JacobCollier

See how Abe Laboriel Sr. uses Kala U-Bass Rumbler Mahogany

Abe Laboriel Sr.

Bassist

Koinonia (Band)

...
Verified via YouTube

In the attached video (courtesy of U-Bass's website and Kala's YouTube channel), Abe is featured playing a Kala U-Bass that appears to be the Rumbler with a mahogany body.

Genre Usage

Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.

Used With

Based on how musicians on Equipboard use Kala U-Bass Rumbler Mahogany, it is most commonly used with the following gear.

Gibson J-45
Gibson J-45 Steel-string Acoustic Guitars
1

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