The heart of the system is the pickup itself.

The patented design of the Martin Thinline Goldplus Acoustic Pickup System solved the age-old problems of string balance, string spacing and wire-hole placement making it applicable to all guitars. The pickup material is a highly sensitive copolymer specifically formulated for guitars. The short distance from the undersaddle pickup to its internally mounted preamp maintains the integrity of the information-loaded pickup signal. The preamp is designed for instruments that are amplified at high volumes, especially full-size guitars. It is voiced to control boominess and to provide extra brightness. Recommended for musicians in situations where the guitar needs to stand out and sound natural without feeding back. The circuitry on this preamp allows a battery life of 12,000 hours.