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Double Bass C (or B) Extension

Discussion in 'Setup & Repair [DB]' started by rd112188, Sep 28, 2010.


  1. rd112188

    rd112188

    Feb 19, 2007
    Louisville Ky
    :help:

    I was wondering if anyone could shed any light on the differences in materials used to make the extensions. I have seen Brass, All ebony, as well as Maple with ebony fingerboard.
    Which will affect my current sound less?
    RD
     
  2. robobass

    robobass

    Aug 1, 2005
    Cologne, Germany
    Private Inventor - Bass Capos
    The biggest issue is weight, so anything made of wood will certainly have less impact than would a brass extension. The difference in weight of an extension made of maple with an ebony top vs. solid ebony is less significant than the design of the extension itself, as some luthiers build much more massive extensions than others, and the geometry of your scroll will also play a role in how it must be built. Stiffness probably also plays a role, but again I doubt the difference in sound between solid ebony vs. maple/ebony based on this parameter is very great. At least I've heard no such claims.

    One thing to consider though is that any extension is going to affect the sound of your bass somewhat, and the effect of added weight to the scroll is often positive. Traeger's book describes a clever trick: clamping weight to the pegbox, based on the predicted weight of the extension. It isn't a perfect indicator, but a very easy way to get a basic impression. An off-the-top-of-my-head estimate of the weight range of popular wood C-extension designs (without latch hardware) is between 150 and 250 grams. By doing a little experimentation at home, you can decide which way you want to go, and your luthier can choose woods and design parameters to build a heavier or lighter extension.

    Hope this helps!
     
  3. Primary

    Primary TB Assistant

    Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

     
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