Gear article
D'Addario Kaplan Double Bass Strings
The D'Addario Kaplan Double Bass String Set is a professional-grade orchestral string series designed for 3/4 size instruments. These strings are engineered to provide a balanced response for both bowing and deep, rounded pizzicato performance in orchestral settings.

Overview
The D'Addario Kaplan series represents a premium offering within the brand's bowed string catalogue, specifically targeted at professional double bassists. These strings are constructed to meet the rigorous demands of orchestral environments, where a balance of clarity, power, and control is essential. The Light tension variant is designed to offer easier playability and a quicker response compared to heavier gauge alternatives, while maintaining the characteristic tonal depth associated with the Kaplan line.
Performance and Response
A primary design focus of the Kaplan double bass strings is the bowing response. Players often require a string that speaks immediately under the bow without excessive scratch or lag, a requirement these strings are specifically manufactured to meet. In addition to their arco capabilities, the strings provide a specific pizzicato character. Unlike jazz-oriented strings that may focus on long sustain and bright overtones, the Kaplans produce a sound that is described as full and rounded, with a controlled decay that suits classical repertoire.

Tonal Character
The sonic profile of the D'Addario Kaplan strings is defined by a combination of clarity and warmth. This balance is maintained consistently across both the lower register and the higher positions of the instrument. The strings avoid excessive brightness, focusing instead on a deep bass foundation that provides the necessary 'thump' for orchestral support while remaining articulate enough for melodic passages. This versatility allows for excellent dynamic control, enabling the player to transition from delicate pianissimo to powerful fortissimo with predictable tonal results.
Suitability and Applications
These strings are most appropriately suited for professional orchestral players or advanced students who require a reliable, high-fidelity string for ensemble work. Because they are designed for a 3/4 size bass—the standard size for most adult professional instruments—they are a versatile choice for many performers. The light tension is particularly beneficial for players who prefer a more supple feel under the fingers or for instruments that respond better to lower downward pressure on the bridge.
Comparison to Alternatives
Within the D'Addario ecosystem, the Kaplan sits alongside the Helicore series, though it is tailored more specifically for a traditional orchestral response. Compared to other professional strings like the Thomastik Spirocore (often favoured for its sustain in jazz) or Larsen cello and violin strings, the Kaplan double bass strings prioritize a rounded, warm orchestral 'darkness'. While specialized guitar strings like the Ernie Ball M-Steel or Tim Henson signatures focus on high-output magnetic response, the Kaplans are strictly acoustic-mechanical in their design, focusing on how the string interacts with the bow and the wooden body of the bass.
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Frequently asked questions
- What size double bass are these strings designed for?
- These strings are specifically designed for a 3/4 size double bass, which is the standard size for the majority of adult professional players.
- What is the tension rating of this specific D'Addario Kaplan set?
- This specific set is rated as 'Light' tension. This generally allows for a more responsive feel and easier fretting or stopping of the strings compared to Medium or Heavy tensions.
- Are these strings better for bowing or plucking?
- While they are designed with a focus on excellent bowing response for orchestral use, they are also crafted to provide a full and rounded pizzicato sound.
- Do these strings have a lot of sustain when played pizzicato?
- No, they are designed to provide a deep bass sound without too much sustain or brightness. This makes them ideal for the controlled, punchy pizzicato required in orchestral settings.
- How would you describe the tonal balance between registers?
- The strings are engineered to provide clarity and warmth consistently across both the low and high registers of the double bass.
- What type of player is the target audience for Kaplan strings?
- They are designed primarily with professional orchestral players in mind who require precision, dynamic control, and a traditional tonal profile.
- What is the typical price for a set of these strings?
- The typical price range for the D'Addario Kaplan Double Bass 3/4 Light set is approximately £231.
- Do these strings offer good dynamic control?
- Yes, one of the key features of the Kaplan series is the ability to maintain excellent dynamic control across a wide range of volume levels.
- Are these strings bright or dark in character?
- These strings lean towards a warmer, more rounded sound rather than a bright or metallic character, which helps achieve a deep bass tone.
- How does the bowing response compare to other strings?
- The manufacturer highlights an 'excellent bowing response,' which is a specific design priority for the Kaplan line to satisfy classical musicians.
- Can I use these on a 1/2 or 1/4 size bass?
- These strings are specifically sized for a 3/4 bass. Using them on smaller instruments may result in incorrect tension and potential damage or poor playability.
- Does D'Addario produce other strings for bowed instruments?
- Yes, D'Addario produces various strings for bowed instruments, including the Helicore violin series and Zyex violin strings, though the Kaplan is their premium orchestral bass offering.
