I have a small e10k that I want to make another box for. I know its not an Spl sub but I want to know how big of a box could this handle and still perform properly? I already made it a small .75 cuft. sealed, but I like the real low tones, sealed sometimes dont get it done for me. Anyways how big of a box can I make for it and port it to maybe 40 hz? Is that too low for a 10?