These Speaker Cabinet Port Tubes are ideal for building your own PA Speaker Cabinets or replacing old ones! The port is an essential part of the PA Speaker Cabinet! When properly installed it is responsible for the performance of the low end frequency output of the speaker cabinet! The black finish makes these ports a perfect accessory to your PA Speakers! Save and order these today!. With your purchase you will receive 4 Speaker Cabinet Port Tube pictured and described above. So put it in your cart and be ready for all the road throws at you!