Gear article
D'Addario EPBB170 Phosphor Bronze Acoustic Bass Strings
The D'Addario EPBB170 is a set of long-scale phosphor bronze strings specifically engineered for acoustic bass guitars. Featuring a high carbon steel core and precision-wound wrap wire, they are designed to provide a balanced tonal profile suitable for both unplugged and amplified performances.

Overview and Construction
The D'Addario EPBB170 set is a industry-standard choice for acoustic bassists seeking a reliable and tonally balanced string. The construction utilizes a high carbon steel core, which provides the necessary tensile strength and structural integrity to maintain tuning stability under the high tension required for bass instruments.
The outer wrap is made of phosphor bronze, an alloy introduced to string manufacturing by D'Addario in 1974. This material is precision-wound to ensure consistency across the length of the string, resulting in a smooth feel that reduces excessive finger noise while remaining comfortable for extended playing sessions.
Tonal Characteristics
These strings are engineered to produce a rich low-end response coupled with clear, defined mid-range frequencies. The phosphor bronze wrap is known for its warmth and 'woody' character, which complements the natural resonance of an acoustic bass body.
Unlike nickel-wound strings often found on electric basses, the EPBB170 set provides the acoustic projection needed for unplugged settings. When amplified, the clear mids help the instrument cut through a mix without becoming overly harsh or brittle in the high frequencies.

Playability and Gauge
The EPBB170 set uses a 45–100 gauge (.045, .065, .080, .100). This specific gauging is designed to offer an 'easy feel' across the fretboard. By balancing tension and flexibility, D'Addario ensures these strings are suitable for various technical demands, from fingerstyle playing to pick work.
As a long-scale set, they are intended for standard full-size acoustic basses. The tension is calibrated to be high enough to drive the soundboard of an acoustic instrument effectively while remaining light enough to prevent hand fatigue during live gigs or long practice sessions.
Applications and Compatibility
The EPBB170 is versatile enough for diverse musical environments, ranging from intimate acoustic sets to full-band performances. They are a dependable choice for players who transition frequently between purely acoustic environments and plugged-in stage setups.
While D'Addario produces a wide variety of orchestral and guitar strings—such as the Zyex violin series or the Ernie Ball M-Steel sets for electric guitar—the EPBB170 remains a specialised product focused specifically on the unique frequency requirements of the acoustic bass guitar.
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Frequently asked questions
- What is the primary material used in D'Addario EPBB170 strings?
- These strings feature a high carbon steel core wound with a precision-applied phosphor bronze wrap wire. This combination is designed to balance structural strength with tonal warmth.
- What are the specific gauges included in the EPBB170 set?
- The set includes four strings with the following gauges: .045, .065, .080, and .100. This is considered a standard light-medium gauge for acoustic bass guitars.
- Are these strings suitable for short-scale acoustic basses?
- No, these are long-scale strings. Using them on a short-scale instrument may result in improper tension or fitment issues at the tuning pegs.
- How does phosphor bronze affect the sound compared to 80/20 bronze?
- Phosphor bronze generally offers a warmer, mellower tone with more longevity than 80/20 bronze. It is known for its rich low end and clear, smooth mids.
- Can these strings be used on an electric bass guitar?
- While they will fit, they are specifically voiced for the resonance of acoustic instruments. Additionally, phosphor bronze is less magnetic than nickel or steel, which may result in lower output on traditional electric bass pickups.
- What kind of core does the EPBB170 use?
- The strings utilize a high carbon steel core. This material is chosen for its reliability and ability to hold pitch under the high tension required for bass instruments.
- Are the EPBB170 strings good for unplugged playing?
- Yes, they are designed to provide the projection and balanced sound necessary for unplugged performance. They help maximize the natural volume of the acoustic bass body.
- Do these strings work well for amplified performances?
- Yes, they provide a dependable tone that holds up well when amplified. The clear midrange ensures the bass remains audible in a full-band setting.
- How do these strings feel under the fingers?
- D'Addario describes the EPBB170 as having an easy feel across the fretboard. The precision winding helps create a smooth surface that is comfortable for long playing sessions.
- In what price range do these strings typically retail?
- In the UK market, these strings typically retail for approximately GBP 39. Prices may vary slightly depending on the specific retailer.
- Are these strings suitable for beginners?
- Yes, the 45-100 gauge is a standard choice that offers a good balance of playability and tone. It is comfortable for players still developing their hand strength.
- What musical genres best suit the EPBB170 set?
- These strings are highly versatile and suit a wide range of genres. They are commonly used for folk, acoustic rock, jazz, and any setting requiring a warm, organic bass tone.
