Bach Backbore

Please Note: Allow at least 90 days for all Bach special orders. Sometimes this delay is longer.
Bach special orders are NON-CANCELABLE and NON-RETURNABLE. If paying by credit card, your card will be charged in full at the time you place your order.

The backbore of a mouthpiece bears a certain relationship to the rim, cup shape and throat, and to the make and bore of the instrument on which the mouthpiece is to be used.

If the backbore of a mouthpiece is too small, the high register will be stuffy and flat. If the backbore of a mouthpiece is too large, the mouthpiece will not have sufficient resistance and the player's embouchure will soon become exhausted.

The use of the general terms "large" or "small" to describe backbores must be viewed from the standpoint of playing qualities. It is not actually possible to identify backbores by size alone because they also vary in shape and rate of taper. Various combinations of size, shape, and rate of taper make the tone darker or more brilliant, raise or lower the pitch in one or more registers, increase or decrease volume.

Standard Vincent Bach mouthpieces match the playing qualities of the backbore with the design of the other components. The following chart lists standard backbores.

  • No letters - No. 10 Backbore
  • A Cup Models - No. 24 Backbore: Bigger, darker, symphonic.
  • B Cup Models - No. 7 Backbore: Dark, Schmitt-style
  • C Cup Models - No. 10 Backbore
  • D Cup Models - No. 76 Backbore
  • E Cup Models - No. 117 Backbore: Favors upper register
  • F Cup Models - No. 76 Backbore
  • V Cup Models - No. 25 Backbore: Big, free-blowing, commercial sound
  • No. 3 Backbore: Dark
  • No. 87 Backbore: Big, free-blowing
  • No. 41 Backbore: Bright, more resistant
  • No. 57 Backbore: Lively, good high register
  • Bach Throat

    Please Note: Allow at least 90 days for all Bach special orders. Sometimes this delay is longer.
    Bach special orders are NON-CANCELABLE and NON-RETURNABLE. If paying by credit card, your card will be charged in full at the time you place your order.

    All standard Bach mouthpieces are made with medium-sized throats which produce an even register, good intonation, and sufficient endurance for strenuous, all-around work. A small throat does not produce an easier high register; on the contrary, it not only chokes the tone but contracts the entire register, making high tones flat or the low tones sharp. A mouthpiece with an excessively large throat will make playing softly difficult, however, a large throat may help to produce a bigger tone.

    Numbers and letters are drill bit sizes. The smaller the number, the larger the throat. Generally, the larger the throat, the freer blowing the mouthpiece and the more volume possible. However, as the throat size increases, the upper register tends to sharpen and the player tends to tire more quickly.

    This information comes directly from the Bach Mouthpiece Manual. Click Here to download the Bach Mouthpiece Manual in PDF format.
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