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  • Home
  • Instruments/Bows
    • Basses
      • Fine Double Basses
      • Quality Double Basses
      • Hybrid and Laminated Basses
      • Fractional (Small sized) Basses
      • Sold
    • Bows
      • Archetier (Fine) Bows
      • New / workshop bows
      • Hybrid and Period Bows
      • Violin / Viola / Cello Bows
    • Electric
    • Violins / Violas
    • Cello, Gamba, Harp
    • How to buy or sell with us
    • Bass Gear For Sale
  • Repairs
    • Bubba Bass: The Just Wrong Repairs Gallery
    • Repairs Gallery
    • Italian bass Restoration project
    • Quantum Bass Center C extensions
  • Rentals
    • Concert Rentals
    • Who We Rent To...
  • Web Store - Quantum Bass Market
  • Quantum Bass Blog
  • Info
    • Our Client Stories
    • Links
    • QBC is special
    • Bass Shipping Info
  • Beginning an instrument
    • Beginning Violin Viola Cello Orchestra
  • Guides: Strings etc
    • Bow Hair Tightening
    • About Upright Double Bass Strings
    • About bass rosin
    • 'Bassics' For New Bassists

NB: Per COVID-19 conditions which led to a long backlog, we are currently not taking in new repairs, including building and repairing C extensions. We'll update these pages when circumstances change.

Quantum Bass Center's handmade C extensions

- Top-quality parts and workmanship
- Genuine ebony extension body
- Crack-resistant, highly durable, self-lubricating composite gates (levers)
- Extremely precise intonation
- Adjustable if you change your bridge height/placement
- Elegant and extremely strong while minimizing excess bulk and weight
- Hand-fitted to your scroll: no pads, filler, gaps, or cutting of the scroll; see photos for widely varying scroll projections to which we have fitted extensions that play with no more than 4mm fingerboard clearance at the E gate!!
- Straight string pull both down the fingerboard and through the scroll to the tuning peg
- Only one small hole through the scroll - the side of the scroll is never cut
- For lowest tuning friction and minimal weight, our default is to pass the string through the scroll without the use of additional pulleys.
- Accurate string spacing and minimal fingerboard scoop so you can close the E gate with one hand
- We have built perfectly-functioning extensions WITH a false nut, and also on a 5-string bass
​- QBC is the trusted constructor of top-notch C extensions to numerous nationwide professionals
C extension at Quantum Bass Center
The latest C extension by one of our new luthiers, Alissa Keselmann! A challenging build per the angle of the scroll to the neck, she aced it and it performs perfectly.
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First C extension by one of our new luthiers, Alissa Keselmann!
Bass C extension at Quantum Bass Center
QBC extension, James Fegley bass
5-string bass extension at Quantum Bass Center
QBC extension, 5-string bass
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QBC extension, Pietro Meneghesso bass
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QBC extension, Giovanni Marcolongo bass
Prescott bass C extension at Quantum Bass Center
QBC extension, Prescott bass
Quantum Bass Center extension front view
Prescott extension front view
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QBC extension, fine 19th-century German bass
Where are QBC's C Extensions?  
Baylor University - Houston Symphony - Corpus Christi Symphony - Washington National Opera - Bach Society Houston - Shepherd School of Music (Rice University) - Galveston Symphony - Brazosport Symphony - University of Texas Rio Grande Valley - Northwestern University - Interlochen - USC Thornton School of Music - performers and schools in: Houston TX, Ft. Worth TX, Nashville TN and Taiwan - on stock basses in our showroom
Quantum Bass Center Inc
quantumbasscenter@gmail.com
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