good buy or not solo baric l7 15

The subs you have will work in either enclosure. They produce much better sound in the proper size sealed enclosure. This means a much more useable range of frequencies and better power handling in the lower frequencies (that a ported enclosure cannot play down to). Anyone can build a ported enclosure and call it to the spec for the sub but from my experience with subs in general, you can take any sub, model it on a box calibration program and specify the size and it will calculate the port length and width and number of ports. You can also change the size of the box and make it bigger or smaller and the program will change the port (s) accordingly. But at the end of the day if you take a computer designed box that is built for brand x sub at the minimum airspace possible and compare it to the same type of box with more airspace and the ports recalibrated to match, there is a huge difference in output and "sound quality" between the two.

You have no way of knowing what kind of enclosure this prefab,built to spec box really is. These subs work best in a sealed box or with a large, much larger ported enclosure. True the ported will play louder, but any two 15" drivers are going to play loud, I just happen to like the sound and performance of them in a sealed box. If you go with ported, a subsonic filter is highly recommended to help protect the subs.