Hammond Technical Reference
Hammond is one of the clearest modern systems for players who want dimensions that actually mean something. The logic is stable across trumpet, trombone, tuba, and mellophone: descending diameter ladders, readable cup letters, and a backbore language built for practical fitting rather than mythology.
A size system players can actually translate
Hammond trumpet sizes run from 1 through 7, with lower numbers meaning larger diameters. That makes the line easy to map against Bach and Schilke without pretending it is a literal clone. The real center of the line is size 5, while sizes 3 and 4 cover the large orchestral corridor and 6–7 serve players who need more efficiency.
| Size Band | What It Means | Closest Industry Reading |
|---|---|---|
| 1–2 | Largest trumpet diameters | Bach 1 to 1C territory |
| 3–4 | Large orchestral corridor | Bach 1¼C to 1½C territory |
| 5 | The central professional size | The Hammond answer to the 3C lane |
| 6–7 | Medium-small to small | 5C / 7C crossover logic |
The ML cup is the middle of the whole Hammond philosophy
Hammond’s real design signature is not the diameter chart by itself. It is the way the cup letters shape resistance and tone. The ML cup is the most important one: it tries to hold onto bowl depth while keeping some of the directness and efficiency players usually associate with a V-shaped response.
| Cup | Geometry | Use Case |
|---|---|---|
| S | Shallow bowl | Lead / commercial speed and brilliance |
| Mb | Medium bowl | More support than ML, still versatile |
| Mv | Medium V | Free feel with a slightly leaner, quicker response |
| ML | Hybrid bowl + V | The Hammond center of gravity |
| MLx / MLH | Focused / heavyweight ML variants | C trumpet focus or symphonic stability |
| L | Large V style | Broader symphonic depth without becoming dead |
The same system discipline extends into low brass and marching brass
Hammond low brass follows the same readable logic as the trumpet line. Tenor trombone starts in the 10–14 corridor, bass trombone expands into 19–21 and BL/BXL territory, and tuba uses a simple 29/30/31 size ladder. Even mellophone is treated as a real design branch, not a leftover accessory category.
| Code | Family | Practical Meaning |
|---|---|---|
| 10–14 | Tenor / alto corridor | The main tenor ladder, from large tenor to smaller jazz and alto fits |
| 19–21 | Bass corridor | The large bass trombone diameters |
| BL / BXL | Bass bowl families | Large low-brass cups with a funneled throat entrance |
| 29 / 30 / 31 | Tuba sizes | The tuba diameter ladder |
| 5MP / 6MP | Mellophone | Marching and drum corps-specific shapes |
Why Friedman and symphonic Hammond models matter
The Friedman collaborations matter because they show Hammond’s low-brass logic under real principal-player pressure, not just in a catalog vacuum.
Hammond’s heavier symphonic options are about projection stability and tonal core, not just adding metal for the sake of it.
Where to begin if you want a Hammond fit without overcomplicating it
Most players should begin in the 4–6 corridor, then choose S / ML / L based on role rather than chasing tiny diameter shifts first.
12ML is the most logical orchestral starting point. From there, the question is usually depth and bore feel, not size panic.
Low brass Hammond fitting is about airflow matching. The right choice is the one that lets the sound open without losing articulation shape.