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  • SpectraTone Add-ons
  • >
  • SpectraTone Backbore Variations

SpectraTone Backbore Variations

SKU:
$42.00
$42.00
Unavailable
per item

We will stop taking orders for Kickstarter add-ons January 7th, 2022.


Your order must ship with your Kickstarter SpectraTone mouthpiece and you must include your backer number to be eligible for this promotion. Please choose "pick-up" option to complete checkout.


The Backbore is an extension of the Throat that determines tonal color, intonation, and projection pattern.

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Add to Cart
Most standard mouthpieces have backbore measurements in the following range:
Beginning Diameter = .20 to .22 inches
End Diameter = .31 to .35 inches
* Extended length backbores are available to adjust gap and fit extra long receivers


A 3C backbore is typically .21 by .33 inches and is designated as 21.33. 

Need help with sizes and options? Call us at 303.657.2747 or email harrelsontrumpets@gmail.com to discuss your needs with our team of experts. Over 60 standard sizes are in stock and ready to ship! Please allow up to 12 weeks for custom extended length and special sizes.

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Have questions?

Send an email by clicking the envelope icon to the right. Or call ahead and visit us for an in-person lesson or tour. 303.657.2747

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  • Performance
    • SpectraTone
    • Build My Mouthpiece >
      • Intro to Mouthpieces
      • Artist Series >
        • Artist Bodies
        • Artist Rims
    • Mouthpiece Components >
      • Rim Sizes
      • Cup Sizes
      • Throat Sizes
      • Body Sizes
      • Backbore Sizes
      • Nut Sizes
    • Increase Efficiency >
      • Mod Kits
      • Finger Button Options
    • Adjustable Performance
    • Adjustable Peformance Tools
  • Advantage
    • Trumpet Momentum >
      • Trumpet Momentum Level 1 >
        • TM 1 - Blog
        • TM 1 - Assessments
        • TM 1 - Exercises
      • Trumpet Momentum Level 2 >
        • TM 2 - Blog
        • TM 2 - Assessments
        • TM 2 - Exercises
        • TM 2 - Beta Testing
      • Trumpet Momentum Level 3 >
        • TM 3 - Blog
        • TM 3 - Assessments
        • TM 3 - Exercises
        • TM 3 - Beta Testing
        • TM 3 - Case Studies
        • TM 3 - Regional Clinics
    • The Harrelson Story
    • We have Your size
    • Technology
    • 100% Guarantee
  • Instruments
    • Model Comparison
    • Buy A Harrelson
    • Muse Modular MMXX
    • 2021 VPS Summit G-Series
    • "X" Series
    • Limited Editions >
      • Summit One
      • Summit Midnight
      • Summit Art
    • Bravura Series >
      • 2021 Bravura Flugelhorn
      • 2021 Bravura Piccolo
    • 2018 VPS Summit Series
    • HT6 - Kickstarter 2022
    • VPS Summit Eb
    • Acoustic Armour
    • Trumpet Gallery
  • News
    • Jason's Blog >
      • Jason Harrelson
    • Lessons Link
    • Teacher Information
    • Weekly Trumpet Challenge
    • Get Social
    • Clinics & Tours
    • Our Clients >
      • Client Features
    • Jen's Blog
    • Company History
  • Clients
    • Contests & Winners
    • Order My Trumpet >
      • Leadpipes & Bells
      • Tuning Slides & Bell Crooks
      • Receivers
      • Bottom Cap options
      • Water Keys
    • Contact Us
    • Shipping
    • Instrument Registry
    • Acclimation
    • Maintenance
    • Roots of Music
  • Store