How big is the sound hole in a cajon?

Sound hole are crucial for Cajons as these instruments produce bass tones. The air is required to escape, unlike a drum where there is no resonant bass tone. As per acoustic engineering, the position of the hole indicates the sound quality of the Cajons. For example, a too-large hole or too small hole, or a somewhat different shape decides how much air will escape at a time and how. The shape and size also play a crucial factor in terms of preventing any unwanted noise dampening or muffling as the volume increases. It impacts the bass tone produced. Following the key criteria of acoustic engineering, Gappu Cajon keeps the size 5 inches, placed at the bottom of the tapa. As a result, the right amount of air escapes, allowing a clear tone and dampening any unwanted sounds.