Speaker box venting

[forestb]

I sent this message to Kicker

"I have purchased a set of your KS Series 5.25" Coax speakers. I have built a cup shaped sealed enclosure for the speaker. It is made out of 1/2 inch mdf. The inside of the enclosure is 4.5 inches in diameter and around 2.5 inches deep. I am wondering if this will work with the speakers or will it destroy the sound quality."

And this was there reply

"That would be fine. having a sealed enclosure will give them a bit more upper bass and midbass. That will help with output. If you need anything else just let us know."

So I think I will be going with my original plan and use wheel well underlining to seal it from the moisture.