The clarinet mouthpiece is the single most influential piece of equipment in your setup. It shapes your tone, determines how hard you have to work for a sound, and affects your intonation across every register. Yet most clarinetists spend years on the instrument before they give it any serious thought.
This guide covers everything you need to know to choose a clarinet mouthpiece with confidence — whether you’re buying your first upgrade or searching for your professional setup.
Why the Mouthpiece Matters More Than Most Players Realise
Your clarinet’s body, barrel, and bell all contribute to sound. But the mouthpiece is where the vibration begins. It determines:
- How freely the reed vibrates (response)
- The core character of your tone — bright or dark, focused or full
- How much physical effort you need to sustain sound
- Your ability to play in tune across all registers
A good mouthpiece makes technique easier. A poor match makes it harder, no matter how well you play.
The Key Specifications Explained
Tip Opening
The tip opening is the gap between the end of the mouthpiece tip and the tip of the reed when the reed is resting flat. It’s measured in millimetres and is the most important single spec on any mouthpiece.
- Closed (under 1.15 mm): Quick, precise response. Easier to control at low dynamics. Suited to orchestral and chamber playing. Works well with harder reeds.
- Medium (1.15–1.25 mm): The most versatile range. Balanced between ease of response and dynamic flexibility. Suitable for most playing styles.
- Open (over 1.25 mm): Fuller, more projecting tone with wider dynamic range. Requires more embouchure control. Preferred by soloists and players who want expressive freedom.
No tip opening is universally best. The right one depends on your embouchure, your reeds, and how you play.
Facing Length
Facing length is how far along the mouthpiece the reed is in contact with the lay. A shorter facing means quicker response and a brighter tone. A longer facing gives a slower, warmer response and more tonal depth. Facing and tip opening work together — a wider tip with a shorter facing behaves very differently from a narrower tip with a longer facing.
Chamber Size
The internal chamber shape and volume affect tone colour. Larger chambers tend to produce a darker, fuller sound. Smaller chambers give a brighter, more focused result. Most professional mouthpieces are designed with a specific chamber to complement a particular playing tradition — French, German, or Viennese.
Material
The two main materials are hard rubber (ebonite) and synthetic resin (plastic).
- Hard rubber has been the professional standard for over a century. It absorbs vibration in a way many players find warm and responsive. It can deteriorate over time if exposed to sunlight.
- Synthetic mouthpieces are more consistent from piece to piece (no variation between batches), weather-resistant, and increasingly used at professional level. Modern CNC-machined synthetic mouthpieces offer exceptional precision.
Matching a Mouthpiece to Your Playing Style
Orchestral Playing
Orchestral clarinetists typically need a focused, centred tone that blends well in an ensemble without projection issues. A medium to closed tip opening with a carefully balanced chamber is the most common choice. Intonation consistency across all registers is critical. The Viennese tradition places particular emphasis on this — a warm, blending sound that supports rather than dominates the ensemble texture.
Chamber and Ensemble Playing
Similar priorities to orchestral, with a slight premium on flexibility. The ability to shift tone colour without changing embouchure is useful in small groups. A medium tip opening tends to work well here.
Solo Playing
Soloists generally prefer more projection and a richer dynamic range. An open tip opening gives more room to shape phrases and colour individual notes. The trade-off is that it requires more embouchure development to control.
Jazz and Contemporary
Jazz clarinetists often use more open tip openings to achieve a full, projecting tone that cuts through without amplification. Brighter chambers and harder reeds are common.
Beginners and Students
A medium tip opening with a forgiving facing is ideal for developing players. It should respond easily at all dynamic levels and produce a consistent tone without requiring constant embouchure correction. The worst thing a beginner’s mouthpiece can do is make the player compensate with tension.
How to Actually Test a Mouthpiece
The only reliable way to choose a mouthpiece is to play it. Reading specs tells you where to start — not where to finish. When testing, focus on:
- Response at low dynamics: Can you start a soft note cleanly, without cracking?
- Intonation in the throat tones: G, A, and B-flat in the middle register are where most clarinets go out of tune. A good mouthpiece minimises this.
- Tone evenness across registers: Does the sound change character dramatically between the chalumeau and clarion registers?
- Physical comfort: Does the mouthpiece fit naturally in your embouchure without you having to adapt to it?
Play your usual repertoire rather than scales. The problems that matter will show up in real musical context, not technical exercises.
The Reed Connection
Mouthpiece and reed are inseparable. A mouthpiece that suits a harder reed may feel unresponsive with a softer one, and vice versa. When you change mouthpiece, expect to experiment with reed strength and cut. This is normal. Don’t judge a mouthpiece on the first day — give it at least two or three sessions with different reeds before drawing conclusions.
Try Before You Commit
Buying a mouthpiece without trying it is a gamble. The same model can feel different from piece to piece, and what works for another player may not suit your embouchure, your instrument, or your reeds.
The Gleichweit Test Box lets you try up to 5 mouthpieces at home for 7 days for $40. You play them in your own environment, on your own instrument, with your own reeds — and keep what you love. It’s the closest thing to having a mouthpiece maker in the room with you.
Browse the full range of Gleichweit clarinet mouthpieces — available in closed, medium, and open tip openings for Bb, A, bass, E-flat, and contrabass clarinet.