Review on 🔊 Enhanced Bass Air Ports for Goldwood Speaker Box - 2 Black Speaker Port Tubes (PT-308-2) by Dennis Brinson

For those wondering what size hole to cut, the material thickness at the ribbed areas is about 1.5mm which is 1/16 inch for my imperial brothers. So if you don't have an 80mm hole saw, you may need to do some sanding/rasping after the 3" hole. I used a router. I would assume this applies to all Goldwood ports, but I can't say for sure. DO NOT FORCE. They are plastic and will break. If you make them a little bigger there is RTV wood glue/chalk/silicone for that, happy tuning.