Kala Rumbler U-BASS FS

^# 9

Equipboard's ranking is determined by analyzing factors such as professional artist usage, popularity, user ratings, reviews, and more.

$292.79 to $399.00 Price Tier: Standard

5.0 (4)

Find out who is using Kala Rumbler U-BASS FS

1 community setup

10 wishlisted

17 saved

Page last updated Jul 05, 2026

Pricing and availability

We compare 600+ stores and found this item at 6 stores. Prices updated July 4, 2026.

Store

Reviews

Price

4.0 (7)

$399.00

View Deal

4.5 (8)

$399.00

View Deal

3.9 (4)

$399.00

View Deal

5.0 (5)

$292.79 2 available Used

View Deal

5.0 (3)

$338.00

View Deal

£399.99

View Deal

Average Price: $366

Standard/Professional

$100

$401+

Price Tier

In the Ukuleles category, Kala Rumbler U-BASS FS 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.

Budget

Standard

High-end

Price History

Based on price data from 3 merchants for "Kala Rumbler U-BASS FS". 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

Edit description

Discover the Kala Rumbler U-BASS FS, where the worlds of portability and deep bass tones merge seamlessly. This acoustic-electric bass ukulele offers a surprisingly rich sound, defying its compact size. Designed with both the amateur and seasoned musician in mind, the Rumbler U-BASS is perfect for jam sessions, live performances, or just casual strumming at home. Its laminate mahogany body provides warm, woody undertones, while the custom Aquila strings ensure a full-bodied, resonant bass sound that rivals larger instruments.

Equipped with custom Kala electronics, including an active EQ and built-in tuner, the Rumbler U-BASS guarantees that you'll always have precise control over your tone. Whether you're plugged into an amp or playing acoustically, this instrument delivers a vibrant and punchy sound. Its 21" scale length and 16-fret fingerboard offer a comfortable playing experience, making it ideal for bassists of all skill levels. Plus, it comes with a deluxe padded gig bag, making it easy to take your music wherever you go.

Key Features:

Compact 21"-scale, 16-fret fingerboard for comfortable playability
Laminate mahogany construction for a warm, rich sound
Custom Aquila strings deliver deep bass resonance
Custom Kala electronics with active EQ and built-in tuner
Onboard piezo pickup for excellent live sound
Extremely portable and meets most carry-on standards
Includes a deluxe custom U-Bass padded gig bag for easy transport

Product specs

Number of Strings	4
String Type	Polymer
Body Type	Acoustic Bass
Body Shape	U-Bass
Left-/Right-handed	Right-handed
Finish	Polyurethane
Top Wood	Laminate Mahogany
Back & Sides Wood	Laminated Mahogany
Binding	Black
Neck Material	Mahogany
Fingerboard Inlay	Custom Kala Inlay
Number of Frets	16
Scale Length	21"
Nut Width	1.75"
Bridge Material	Walnut
Tuning Machines	Custom Die-Cast Tuners
Electronics	Shadow U-Bass Preamp
Strings	Aquila Silver Rumbler UBASS strings
Case/Gig Bag	Gig Bag

FAQs

What is the tuning of the Kala Rumbler U-BASS FS?: The Kala Rumbler U-BASS FS is tuned to EADG, similar to a standard bass guitar, allowing for familiar playability for bassists transitioning to this instrument.
Is the Kala Rumbler U-BASS FS suitable for live performances?: Yes, the Kala Rumbler U-BASS FS is equipped with a Shadow U-Bass Preamp, making it suitable for live performances with its acoustic-electric capabilities.
What kind of strings does the Kala Rumbler U-BASS FS use?: The Kala Rumbler U-BASS FS uses Aquila Silver Rumbler UBASS strings, which are made of polymer and contribute to its distinctive sound.
What materials are used in the construction of the Kala Rumbler U-BASS FS?: The Kala Rumbler U-BASS FS features a body made of laminate mahogany, a neck also crafted from mahogany, and a walnut bridge, providing a warm and resonant tone.
Does the Kala Rumbler U-BASS FS come with a case or gig bag?: Yes, the Kala Rumbler U-BASS FS includes a gig bag, offering protection and convenience for transport.

Videos

Add video

Reverb

Kala U-Bass Demo with Rob Scallon | Reverb.com

Reverb

Kala Rumbler U•BASS

kalabrandmusic

Kala U-Bass Rumbler (Ukulele Bass) Demo

C. A. House Music

Kala U-Bass Rumbler - Fingerstyle Demo

Maarten Plukker

Reviews

Add review

Owner Insights

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

User experience

0 0

Playing with a pick on rubber strings is possible and enhances articulation, despite initial tactile drawbacks.
Source
0 0

Transitioning from a 34" bass to the 20" U-Bass scale is manageable with practice, though playing above the 12th fret is less optimal.
Source
0 0

The fretless U-Bass models avoid mild buzzing issues reported on fretted versions, offering a cleaner sound.
Source
0 0

Pre-tensioning strings with minimal wraps can improve tuning stability, though it requires securely knotting the strings to the tuner.
Source

Use cases and applications

0 0

The U-Bass is not suitable for outdoor campfire settings due to ambient noise overpowering its acoustic output.
Source
0 0

The U-Bass is ideal for quiet practice settings, allowing players to rehearse in environments where a full-sized bass might be obtrusive.
Source
0 0

The Kala U-Bass, when paired with a Phil Jones Double Four amp, offers portability and enough volume to accompany an acoustic guitar effectively.
Source

Value and pricing

0 0

Some owners have purchased discounted Kala U-Basses with minor cosmetic defects for as low as $100, finding the flaws negligible.
Source

Features and functionality

0 0

The U-Bass can sound akin to a P bass when fitted with steel strings and amplified, offering versatility for various musical styles.
Source
0 0

The Kala U-Bass is noted for sounding remarkably like an upright bass when amped, despite its small size.
Source

Mods and upgrades

0 0

Labella Silverbacks strings improve unplugged clarity, making it suitable for smaller, intimate settings without overpowering accompanying instruments.
Source
0 0

Installing roundwound strings on a Kala Nomad requires a different nut but offers an electric bass-like playability.
Source
0 0

The Aquila Thunder Reds are highly praised for tone and durability, offering a waxier feel than the stock rubber strings.
Source

Comparisons

0 0

Compared to cheaper models like the Hadean, the Kala U-Bass offers more precise tuning and is suitable for gigs.
Source
0 0

The Kala roundwound strings maintain a thumpy tone akin to an electric bass, contrasting with the unique warmth of the rubber strings.
Source

Setup and maintenance

0 0

The E string's truss rod adjustment can address buzzing issues, though its location may be tricky for new users to find.
Source
0 0

High action can feel clumsy; roundwound metal strings may alleviate this but require a truss rod, which Kala models have.
Source
0 0

Frequent tuning adjustments are necessary as strings continue to stretch, though the stretching slows after a few months.
Source

Add review

5.0 out of 5

Based on 0 Reviews and 4 Ratings

5 star

4 star

3 star

2 star

1 star

Artist usage

Add artist

Jacob Collier

Singer, Guitarist

Verified via YouTube

Collier uses this instrument in various songs, including his rendition of Georgia On My Mind, during the melodica solo.

Scott Devine

Bassist

Verified via YouTube

"So, a Kala-U bass… I’ve been wanting to get my hands on one of these for SO long.

After watching so many fantastic players over the last few years get such a great tone out of them, when my wife asked me for some Christmas present hints of what i’d like Santa Claus to bring me - I had one thing in mind…

… a Kala U-Bass!

Luckily, my wife and Santa came up with the goods this year and on Christmas morning I had a beautiful little Kala U-Bass waiting for me under the Christmas tree.

Now, I should say at this point - after about 4 hours of me playing the thing constantly since the unwrapping took place (through everyone else opening their presents - oops) and essentially forgetting that Christmas was actually taking place… I think my wife was regretting the idea, lol… but, that’s a whole different story!

Anyway, what were we talking about?… oh yeah, the U-Bass.

Ok, so I thought i’d film a short review type of vid… not that it’s really a review, but more of my first thoughts, and a little issue I discovered that happens when you slide into a note that might help you out f you buy one of these basses in the future.

Hope you enjoy it.

If you do, check out some of my other lessons - you might like those too! ;) "

Nicole Row

Singer, Bassist

Panic! at the Disco

Verified via Photo

In this post Nicole can be seen using her Kala ubass

Chris Baio

Singer, Guitarist

Vampire Weekend

Verified via Home Brew Audio

Chris Baio began using the Kala U-Bass in 2019 on the Father of the Bride tour. The U-Bass was used throughout the tour on the song "Sympathy." The bass appeared on The Late Show with Stephen Colbert on Sep. 11, 2019.

Late Show: https://www.youtube.com/watch?v=mEZLc6iB_v8

Live show in Ot 2019: https://www.youtube.com/watch?v=ayehItqhdK4