Martin features the following lines of acoustic guitar strings.
Martin
FX Flexible Core
SP Stage and Studio Performance
Martin SP Lifespan
Within those lines, they feature the following types:
80/20 Bronze
92/8 Phosphor
We tried out the SP 4100 Phosphor Bronze acousting guitar strings.
Here’s what Martin has to say about them:
Martin MSP4100 Phosphor Bronze Light Acoustic Guitar Strings are made from a 92/8 composition alloy to give that brilliance, clarity, and longevity of sound required by serious guitarists. The phosphor bronze winding alloy is ideally suited for making strings that have deep, rich basses and clear, bright trebles that today’s acoustic guitarists demand. Martin strings are high-quality strings designed for daily use. Martin acoustic guitar strings are wound to precise specifications. Core and wrap wires must meet strict requirements to make the grade.
Here’s what we had to say:
These strings have a nice loud tone. They have superior sustain and reonation qualities about them. They also have a nice bright tone. The brightness may be too bright for some initially, but after playing a short while, they settle in to a nice warm tone that still retains much of the brightness.
These are also a pleasure to play. They are very easy on the fingers.
As far as durability, we found that these strings keep their tone for a good long time, ever after performances. we had no problem with breakage, although some players have reported some issues.
The price on these can’t be beat. You’ll find these online for about 5 bucks or less.
Overall, a quality string with a great sound.
Here’s a brief video where you can get an idea of the tone of these strings. The playing is nothing fancy, but you can still make out the tone.