Is it possible to shorten the tube length while maintaining the tuning frequency of the box?
Yes. The port tube length can be shortened by reducing the total port area. When the port area is reduced, the port tube length must be decreased as well in order to maintain the same tuning frequency of the box. But keep in mind that reducing the area of the port will increase port turbulence and may cause the port to become noisy at higher power levels. If this is your only option, we recommend rounding the inner edges of the port (at both ends of the port tube) or using a port with flared ends to reduce air turbulence at the port openings.
