Low C Extension: Double Bass C Extension Bass Extension

5 out of 5 based on 2 customer ratings
(2 customer reviews)

Upton Bass can build a low extension exactly to your requirements, leaving the scroll intact.

Starting at $1,500

SKU: SKU-501 Category:

Product Description


Upton Bass Low C Extension for Double Bass


Choosing the “C” Extension upgrade option
on your Upton
Double Bass allows you to hit those low notes in the score! We custom
make each extension. $1,500 gets you a custom made English sycamore and
extension and one
gate at the “E” (full ebony extensions start at $2,000). Each
additional gate is $250.

Our fingered bass C extension is
constructed of top quality
English Sycamore and best grade ebony for a lightweight addition
to your bass. An added benefit of our design is that it does not
significantly add length to the scroll, and your bass will still fit in
a standard size bass bag.

The Upton Bass Extension
is not only available on Upton Basses, we can custom make a
C-extension for any double bass
.  If you need an extension for
your precious vintage instrument, the Upton Bass extension is
we will not cut
or drill into your scroll
like the vast majority installed by
other luthiers.  We weep when we see the butchered scrolls of
historic basses!  You know who you are, put away those saws!!
There should be a law.


Low B
are also available if you require!  Please call
us to discuss the B option and pricing for your bass build or existing


English Sycamore and Ebony
C-Extension with Full Gates

The Legendary Low B Extension with Full Gates!

Please e-mail us at
or call us at 860-535-9399 to discuss this or any Upton Bass double
bass upgrade option.


Share your thoughts!

5 out of 5 stars

2 reviews

Let us know what you think...

What others are saying

  1. Matthew Pfeuffer

    5 out of 5

    About three months ago I got the Upton Bass C-Extension put on my Upton Bass Professor Deluxe. I had always wanted a C-Extension for my orchestral playing and finally got the chance to do it. Honestly, I could not be more happier with the purchase. This C-Extension is so innovate and well designed. The low end tone it gives my bass is literally ground shaking. There is no better feeling then letting all the gates go and pounding out a couple low C’s.

    However, in all seriousness, I would recommend this particular C-Extension to anyone who is looking for one. The first amazing thing about this C-Extension is that it doesn’t require drilling throughout the headstock of the bass. The guys at Upton Bass have found a way not to puncture your beautiful bass and still maintain a high quality C-Extension. The second thing the look/design. Incredibly player friendly, this C-Extension is very easy to get around. And finally the C-Extension actually comes off easily! For whatever reason, if you didn’t want it on anymore, you just simple take the string off and the C-Extension comes with it!

    A must have for any serious orchestral player or any player in general because of the demands of modern playing on the double bass.

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  2. Robert Hall

    5 out of 5

    I had the Upton crew put one of these C-extensions on a Hawkes Hybrid. I received it a couple of weeks ago and have been testing it ever since. And, I must say that great care was taken in the design and implementation of this extension and bass. The extension produces a strong and solid low end. It is a very impressive C-Extension. Although, I might suggest that a thin layer of some type of isolation (perhaps rubber) be placed between the wood of the extension and the scroll to reduce rattles. But, overall this bass with the extension performs far and above other basses in this price range. Thanks Very Much!

    A layer of cork actually sits between the maple extension and the scroll to reduce vibrations. I believe the \”rattles\” you are hearing are the string oscillating on the extension. To make an extension not do this, the string heights would have to be VERY high. Enjoy your bass!

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