The O-Port is a small, light plastic disc engineered to improve the sound of any acoustic guitar, with main emphasis on richness and fullness of its sound as well as feedback reduction.
The O-Port adjusts the way sound resonates through the body of an acoustic guitar. Its unique shape controls the movement of sound waves created by string vibration. This generates more volume, a better clarity and a fuller sound.
The O-Port can be used on any acoustic guitar with a round sound hole. It comes in two colors and sizes for guitars with a smaller (3.375” to 3.5”) and bigger (3.843” to 4”) sound hole.
The O-Port modifies and improves the sound of every guitar. The effect works for high-end guitars as well as cheaper instruments and is especially audible when using a microphone. If you are still not sure, check out the "Artists" section for feedback from guitar pros.