Encased in high-quality mahogany, SP-1 installs easily into the soundhole of most steel-string guitars. Employing ferrite magnets for a fast and articulate attack, SP-1 captures the sound of your acoustic and delivers a dynamic, clear and balanced amplified ton. No modification to the instrument is necessary. The KNA SP-1 comes with a complimentary 1/8'' to 1/4'' cable.