JK Exclusive T4B

TubaIn Production

Precision Specifications

RIM DIAMETER32.5 mm

CUP DEPTHDeep

THROAT ∅8.2 mm

BACKBOREa2

SHANKtuba

CUP SHAPEapple

Rim Widthmedium

Rim Contourjk-standard

Throat Drill #—

Materialbrass

Finishsilver-plate

Weightoptimized

Recommended For

All Around

About This Mouthpiece

The JK Exclusive T4B is a deep-cup BBb tuba mouthpiece featuring a 32.5mm rim diameter and 8.2mm throat. It has a a2 backbore, tuba shank. Well-suited for all-around playing.

View on Manufacturer Site →JK ↗

Brand Deep Dive

JK · BrassFit Science

JK Guide

Exclusive system, USA-Line, K vs M horn logic, P vs PO low-brass families, and shank decoding.

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Rate This Piece — 8 Dimensions

Physical Feel

Resistance— Back-pressure & support

1 — Free-blowingRestrictive — 10

Rim Comfort— How kind is it on your chops?

1 — UncomfortableVery comfortable — 10

Rim Bite— Sharpness of the rim edge

1 — Very round / forgivingVery sharp / precise — 10

Tonal Character

Brightness— Overall spectral colour

1 — Dark & warmBright & piercing — 10

Tone Focus— Core vs. spread sound

1 — Spread / diffuseCentred / laser — 10

Playability

Articulation— Clarity & crispness of attack

1 — Blurry / sluggishCrisp & immediate — 10

Flexibility— Ease of slurs & pitch bending

1 — Rigid / stiffFluid & flexible — 10

Stamina

Endurance— How long before fatigue sets in?

1 — Tires quicklyPlays all night — 10

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