These 2.75-inch diameter port tubes are essential components for DIY speaker cabinet builders and anyone replacing worn-out ports in existing PA systems. Whether you're constructing custom subwoofer enclosures or refurbishing vintage cabinets, proper port tuning directly impacts your low-frequency output and overall sound quality.

Port tubes control airflow in ported speaker cabinets, extending bass response and reducing distortion at high volumes. The 4.75-inch length provides optimal tuning for most 12-inch and 15-inch PA speaker applications, while the precision-molded plastic construction ensures consistent performance over time.

Each tube features a 2.75-inch inner diameter with a 3.25-inch outer flange that sits flush against your cabinet wall. The cabinet cutout required is 3 inches, making installation straightforward with standard hole saws. The black finish matches most professional PA cabinet aesthetics, maintaining a clean appearance whether mounted on the front or rear baffle.

These ports work well in custom subwoofer builds for mobile DJs, band PA systems, and permanent installations in venues up to 500 people. They're also ideal for replacing cracked or missing ports in older cabinets, restoring proper bass response without expensive driver replacements.

Installation requires only a 3-inch hole saw and basic woodworking tools. Each tube includes the flange for secure mounting against your cabinet wall.

This 2-pack includes everything needed for stereo PA systems or dual subwoofer builds, backed by Seismic Audio's one-year warranty and fast shipping.

Technical Specifications

Frequently Asked Questions

What size hole do I need to cut in my speaker cabinet for these ports?

You'll need to cut a 3-inch diameter hole in your cabinet wall for proper installation. The port tube sits in this hole, with the 3.25-inch flange providing a secure mounting surface against the cabinet. Use a standard 3-inch hole saw for clean, precise cuts.

Are these ports suitable for subwoofer cabinet builds?

Yes, these 2.75-inch ports work well for subwoofer enclosures, particularly with 12-inch and 15-inch drivers. The 4.75-inch length provides appropriate tuning for most compact subwoofer designs. For larger 18-inch subwoofers, you may need longer ports or larger diameter tubes for optimal performance.

How do port tubes improve my speaker cabinet's performance?

Port tubes extend your cabinet's low-frequency response and reduce distortion at high volumes by allowing controlled airflow. Without proper ports, sealed cabinets lose bass extension, while poorly designed ports can cause unwanted noise or frequency peaks. These precision-molded tubes ensure consistent airflow and proper bass tuning.

Can I use these to replace damaged ports in existing PA speakers?

Absolutely. These ports are ideal replacements for cracked, missing, or incorrectly sized ports in older PA cabinets. Measure your existing port's inner diameter and length first to ensure compatibility. Replacing damaged ports often restores proper bass response without needing expensive driver replacements.

What venues or applications work best with speakers using these ports?

Speakers built with these ports handle venues up to 500 people effectively, making them suitable for mobile DJ setups, small to medium band PA systems, and permanent installations in clubs or worship spaces. The controlled bass response works particularly well for outdoor events where low-frequency clarity is essential.

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