These 2.75-inch diameter port tubes are built for cabinet builders, speaker repair shops, and DIY audio enthusiasts who need professional-grade bass reflex ports for PA speaker cabinets. Whether you're building custom enclosures from scratch or replacing damaged ports in existing cabinets, these tubes deliver the precise airflow needed for proper low-frequency performance.

Each port tube features a 2.75-inch internal diameter and extends 4.75 inches in length, providing the optimal air volume displacement for most 12-inch and 15-inch PA speaker designs. The integrated flange design creates a secure, vibration-free seal against your cabinet's front baffle while maintaining the structural integrity needed for high-output live sound applications.

The 3-inch cabinet cutout requirement and 3.25-inch outer flange diameter make these ports compatible with standard cabinet construction practices. Black plastic construction resists moisture and temperature changes while blending seamlessly with professional cabinet aesthetics. The precisely molded interior surface minimizes air turbulence and port noise during high-volume operation.

These ports work well in two-way PA cabinets, floor monitor enclosures, and custom subwoofer designs where proper bass reflex tuning is critical. Cabinet builders typically use these in venues ranging from small clubs to outdoor festivals where clean, extended low-end response matters.

The four-pack format provides enough ports for two stereo pairs or multiple cabinet projects. Each tube installs with basic woodworking tools and standard cabinet adhesive.

Seismic Audio backs these port tubes with a one-year warranty and ships them ready for immediate installation in your next cabinet project.

Technical Specifications

Frequently Asked Questions

What cabinet thickness works with these port tubes?

These port tubes work with cabinet walls up to 1 inch thick, which covers most standard PA cabinet construction using 3/4-inch plywood or MDF. The 4.75-inch tube length provides sufficient material for a secure glue joint while extending properly into the cabinet interior for optimal airflow.

How do I calculate the right port tuning frequency for my cabinet?

Port tuning depends on your cabinet's internal volume, the specific driver you're using, and your target frequency response. Most builders use cabinet design software or online calculators that factor in the port's dimensions alongside your woofer's parameters. These 2.75-inch ports typically tune cabinets in the 45-65 Hz range when paired with 12-inch or 15-inch PA drivers.

Can I use these ports in subwoofer cabinets?

Yes, these ports work well in compact subwoofer designs, particularly for 12-inch driver applications where you need extended low-end response without excessive cabinet size. The 2.75-inch diameter provides adequate airflow for most mobile DJ and small venue subwoofer applications without the port noise issues common with smaller tubes.

What tools do I need to install these port tubes?

Installation requires a 3-inch hole saw or circle cutter, drill, and wood glue or construction adhesive. The integrated flange design eliminates the need for additional mounting hardware - simply cut your hole, apply adhesive to the flange, and press the tube into place from the cabinet's exterior.

How do these compare to larger diameter port tubes?

These 2.75-inch ports offer a good balance between airflow and cabinet space efficiency for most PA applications. Larger 4-inch ports move more air but require significantly more internal cabinet volume and larger cutouts. For most 12-inch and 15-inch two-way PA cabinets, these 2.75-inch tubes provide sufficient port area without compromising cabinet strength or taking up excessive internal space.

WARNING: This product can expose you to chemicals including Di(2-ethylhexyl)phthalate (DEHP), which is known to the State of California to cause cancer. For more information, go to: www.P65Warnings.ca.gov