Martin MSP4600 Acoustic Guitar Strings - 12 String yamaha-under-30k-acoustic-guitars SPL (sound pressure level) is

SPL (sound pressure level) is also commonly referred to as efficiency and sensitivity

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Martin MSP4600 Acoustic Guitar Strings - 12 String yamaha-under-30k-acoustic-guitars SPL (sound pressure level) isMartin MSP4600 Acoustic Guitar Strings 12 String Set Martin MSP4600 Phosphor Bronze Extra Light 12 String Acoustic Guitar Strings are made with a unique composition to give brilliance, clarity, and longevity of sound. The phosphor bronze winding alloy is ideally suited for making strings that deliver deep, rich basses and clear, bright trebles. Martin MSP4600 Features: Extra Light Gauge 12 string Gauges . 010 . 010, . 014 . 014 , . 023 . 010, . 030 .