We spend a lot of time on the design of every one of our enclosures and building every order that we get. But, even more time is spent on our ported enclosures. Every ported box that we build is different and is based on the needs of that application. We take the specs of our enclosure and of your subs and load them into our subwoofer program. There, we work with the dimension of the port size and length to get the the desired tuning, we typically prefer between 35-38hz, but we do reference the manufacturers recommended specs to see what they recommend.
We always compare our ported box to the recommended sealed box for the sub so we can see what we are gaining between the two. Sometimes, due to space limitations, sealed may actually be a better option for what you are wanting, and that comparison is the only way for us to know that.
When we design your ported box, we take into consideration not just the tuning, we also watch to make sure that there isn’t any port noise and that the subs are playing within their safe mechanical limits. So the extra cost is to cover the design time and the extra fabrication time. And as an extra bonus, with our ported boxes, we try and use the port as bracing inside the box to help reinforce the box even more than we normally do. All part of an engineered package to make your subwoofer system perform to it’s fullest.