efficiency

where science meets sound
Harrelson Trumpets
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Our standard SWE Mod Kits will be discontinued in May of 2023

Mod kits
more sound = less effort

Picture
Picture
Mod Kits available for nearly every make and model brass instrument

30 years of research in one package

Flexibility to play seamless wide intervals

Slotting increases accuracy

Stability in all registers at any dynamic


how does it work?

Jason Harrelson, founder of Harrelson Trumpets, discovered something revolutionary
while playing his friend's Bach Strad back in 1992.
Want to know the rest of the story?

Adding Efficiency with mass?

Have you heard that adding mass will darken the tone? Or that heavy bottom caps reduce flexibility?
Both of these myths have been proven to be untrue in numerous experiments and you can learn why here.

What to expect

SWE Mod Kits reduce energy loss in the sound wave, thus increasing efficiency.
This translates to playing with less effort, improved attacks, flexibility, slotting, endurance and dynamics.

Will it fit?

All Harrelson Mod Kits are guaranteed to fit your specific horn.
We offer a full money back guarantee and/or exchange on all Mod Kits that do not fit your instrument perfectly.
All Mod Kit sales are final unless otherwise specified.

how do i order?

Order Now

call or email us

303.657.2747
Email Us

which size?

  • Extra Light 1/4" - light attack, less projection
  • Light 3/8" - moderate attacks, more feedback to the player (.65 ounces)
  • Medium 1/2" - balanced, improved flexibility, solid attacks and slurs (1.23 ounces)
  • Heavy 3/4" - very efficient, crisp attacks at all dynamics, extreme flexibility, less feedback to player (1.83 ounces)
  • Heavier caps truly do not add much more efficiency, yet these are a popular option in 1" to 3" lengths

inlays & engraving

We offer every type of inlay and engraving for your Mod Kit

30 day guarantee

We offer a full money back guarantee and/or exchange on all Mod Kits that do not fit your instrument perfectly.
All Mod Kit sales are final unless otherwise specified.
Picture

Location

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

Take your playing to the next level with Trumpet Momentum Levels 1, 2, and 3!

Ask Jason...

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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