D'Addario D K612 3/4M Double bass Strings

Kaplan Bass Single D String — 3/4 Scale, Medium Tension

The Kaplan Bass Single D String is a 3/4-scale replacement string for orchestral double bass, designed to slot into an existing Kaplan set when one string wears out or a player wants to change tension without replacing the whole set. Built around the same stranded steel core as the rest of the Kaplan Bass line, it gives the D position a balanced tone with clarity and warmth that holds up across the instrument's range. Medium tension sits between Kaplan's light and heavy options, making it a practical choice for advancing students, orchestral section players, and working professionals who need a flexible feel under the bow. Swapping in this single D keeps the set's even response from low to high registers intact, since it is matched to the other Kaplan strings.

Technical Specifications

• Number of Strings: 1
• Name String: D
• Hardness: Medium
• Size: 3/4
• Core: Stranded Steel
• Ending: Ball End
• Compatible With: Bass Guitar

Who It's For

This single D replacement is the right choice for orchestral double bass players who need a reliable string that matches the rest of their Kaplan set. Advancing students, conservatory players, and working professionals who play in orchestras, chamber groups, or solo repertoire will appreciate the balanced tone and quick bow response. Medium tension works well for players who want a flexible feel that handles both lyrical passages and more articulated bow work without being too soft or too stiff. It is also a practical pick for anyone who needs to replace a single worn string without buying a full set, keeping the tonal consistency of the Kaplan line intact.