Essential replacement parts for DIY speaker cabinet builders and repair techs working on ported PA enclosures. These 2-inch diameter port tubes provide the proper bass reflex tuning that vented cabinets depend on for extended low-frequency output.

Each black plastic port tube measures 4 inches long with a 2-inch internal diameter, designed to fit standard cabinet cutouts of 1 7/8 inches. The integrated flange extends the outer diameter to 2 5/8 inches for secure mounting against the cabinet baffle.

Port tubes are critical components in vented speaker designs, allowing air movement that enhances bass response below the cabinet's natural resonant frequency. Without properly sized ports, vented cabinets lose their intended frequency response and power handling characteristics. The 4-inch length provides moderate tuning suitable for mid-sized PA cabinets and subwoofer enclosures.

Perfect for custom PA builds, replacing damaged ports in existing cabinets, or prototype speaker projects. These tubes work well in 12-inch and 15-inch PA cabinets designed for live sound reinforcement, DJ setups, and permanent installations where extended bass response matters.

Installation requires only a hole saw or jigsaw to cut the 1 7/8-inch mounting hole. Each tube fits flush against the baffle and can be secured with wood glue or screws through the flange.

This 2-pack includes both port tubes with Seismic Audio's one-year warranty. Ships quickly so your cabinet project stays on schedule.

Technical Specifications

Frequently Asked Questions

What cabinet cutout size do I need for these port tubes?

Cut a 1 7/8-inch diameter hole in your speaker baffle. The port tube will fit snugly through this opening, with the 2 5/8-inch flange sitting flush against the cabinet surface. Use a hole saw or jigsaw for clean cuts in plywood or MDF.

How do these ports affect my speaker cabinet's sound?

Port tubes allow air to move in and out of vented cabinets, extending bass response below the cabinet's natural resonance. The 4-inch length provides moderate tuning that works well with 12-inch and 15-inch drivers in PA applications. Without ports, vented cabinet designs lose their intended low-frequency performance.

Can I use these ports in subwoofer cabinets?

Yes, these 2-inch x 4-inch ports work well in compact subwoofer designs and mid-sized PA cabinets with subwoofer capability. For larger dedicated subwoofers, you may need longer ports or larger diameters depending on your cabinet volume and target tuning frequency.

What's the difference between different port lengths?

Port length affects the cabinet's tuning frequency - longer ports lower the tuning, shorter ports raise it. These 4-inch tubes provide moderate tuning suitable for most PA applications. Measure your cabinet's internal volume and use online port calculators to determine if this length matches your design goals.

How do I install these port tubes in my cabinet?

Cut the 1 7/8-inch hole, insert the tube from the outside, and secure with wood glue around the flange. Some builders also add screws through the flange for extra security. Ensure the tube doesn't contact internal bracing or drivers, and position away from sharp cabinet edges that could cause air turbulence.

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