Quantum Bass Center
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The home for double bass (upright bass)!

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 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
- Call or email to get on the appointment list today!  Average construction time: 2 weeks
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
Picture
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 - USC Thornton School of Music - performers and schools in: Houston TX, Ft. Worth TX, Nashville TN and Taiwan - on stock basses in our showroom
See our WEB STORE for strings, accessories, and sheet music at unbeatable prices!
3414 La Branch St. Houston TX 77004 USA - 713-909-0994
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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
    • "Stuff" (Bass Gear) for sale
  • Repairs
    • Repairs Price List
    • Bubba Bass: The Just Wrong Repairs Gallery
    • Italian bass Restoration project
    • Quantum Bass Center C extensions
  • Directions / Jobs / Info
    • Directions
    • Employment Opportunities
    • Testimonials
    • Links
    • QBC is special
  • Education
    • SUMMER WORKSHOPS 2017
    • Our Bass Technique Programs
    • For Educators
    • 'Bassics' For New Bassists
    • 'Building a Beautiful Bow Arm' by Tracy Rowell
  • Web Store - Quantum Bass Market
  • Quantum Bass Blog
  • Beginning a stringed instrument
    • Houston Beginning Violin Viola Cello Orchestra
    • Houston Area School Orchestras
  • Rentals
    • Concert Rentals
    • Monthly Stringed Instrument Rentals >
      • TIPS FOR AVOIDING THE SCHOOL-RENTAL RUSH
    • Bass Trunk Rental/Bass Shipping
    • Rental Rescue Program
    • Who We Rent To...
  • Guides: Strings & More
    • Bow Hair Tightening
    • About Bass Strings
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