So I took some time and looked up the thieves small parameters for your driver.
https://www.parts-express.com/Tang-Band-W8-1808-8-Neodymium-Full-Range-Driver-264-894?quantity=1
Based on those values the efficiency bandwidth product comes our to
69.696969697 http://www.calculatoredge.com/new/bandwidth.htm
So that pretty much freedom of choice between a sealed or ported enclosure. There are a lot of tricks to come up with the Qts and -3db point you're looking (hoping) for. I didn't see your design specs so if this helps, good for you. If it isn't helpful, my apologies and best wishes best wishes!